variable gain amplifier design

The third-order intermodulation distortion is -86dB at 10 MHz. I, Reg. cascode structures are two known instances. The main characteristic of the proposed circuits is that errors are not accumulated between linear segments; instead, they are local, providing more robust designs. A low power VGA with a wide range of gain variation and appropriate bandwidth … The amplifier maintains 3dB bandwidth over 300MHz. Meanwhile, the Front-End Amplifier is another of the key elements in the acquisition device, also, one of the main concerns while designing an arrangement amplifier is the interferences generated in the form of common mode voltages [6. An analog voltage controls the gain in both, which differ in how it is applied. Despite low power software using level 49 parameters (BSIM3v3). Manufacturer Application Category. This can be done through the use of variable gain circuits, or variable attenuators and a fixed gain amplifier, depending on the application. In order to surmount some drawbacks of telescopic. bandwidth is almost independent of gain. A digitally controlled amplifier (DCA) is a variable-gain amplifier that is digitally controlled. A digitally controlled amplifier (DCA) is a variable-gain amplifier that is digitally controlled. transistors to achieve desired unity gain frequency, without affecting the output swing. As you know, the single sided output is gm.vi * Rload, so if you steer some of the -gm.vi (from M2) to add up with the gm.vi (from M1), then you have reduced the output signal and hence you have reduced the gain. The DC transfer characteristic almost rail-to-rail ICMR, from 421µV to 1.756V, as well. the overall transconductance of the system, cascode op-Amp to create a variable gain amplifier. Besides, the power consumption of the suggested VGA is 1.96mW with the power supply of 1.8 volts properly, and 1.2pF capacitor load is applied at the output nodes of the amplifier. The chip is fabricated in a 0.35-mum CMOS technology and the measurement results demonstrate the good dB linearity of the proposed VGA and show that the tuning loop can effectively remove dc offset and suppress I/Q mismatch effects simultaneously. In the digital-to-analog converter, a driver circuit using a dynamic latch is implemented to obtain low glitch, a thermometer decoder is used for low DNL errors, guaranteed monotonicity, reduced glitching noise and a threshold voltage-compensated method current source is used. ... One of the most important building block of analog ICs is a variable gain amplifier (VGA), which is used in many applications in order to stabilize the voltage amplitude of a signal at its output [2]. Because the differential voltage on the LM101 is within the low mV range, the 2N5457 JFET will have linear resistance over several decades of resistance Digital VGAs includes solutions with high linearity and high output power across a large bandwidth. This device is known as a variable gain amplifier (VGA), or programmable gain amplifier (PGA). The group delay difference within 30-dB gain control range is smaller than 1%. The layout of the proposed amplifier is designed by using the Cadence Virtuoso, the amplifier core occupies an active area of the only 36.05μm×13.40μm (0.483mm2). The DVGA1-242A+ is a 50Ω RF Digital Variable Gain Amplifier that offers an attenuation of 31.5 dB in 0.5dB steps using a 6-bit serial interface attenuator and 30dB gain using a E-PHEMT amplifier. A high-speed and high-accuracy continuous-time common-mode feedback block (CMFB) is presented. Simulation results show that The PSRR of the proposed BGR at 10 kHz and 1 MHz achieves, respectively, -110.4dB and -51.77dB by using the pre-regulator. However it is often useful to be able to vary the gain. www.electronicdesign.com is using a security service for protection against online attacks. Newly, the reduced supply voltages make some techniques, which are used to increase the gain, unusable in new technologies, clearly [2-5, 7, 8, 12-17]. This work describes a novel high-speed, high-gain and low-noise CMOS operational amplifier with interior CMFB for high-speed applications. The unit has variable gain via a control on the front panel (up to 25dB of gain VHF frequencies 21db for UHF frequencies). Design of a Wideband Variable-Gain Amplifier With Self-Compensated Transistor for Accurate dB-Linear Characteristic in 65 nm CMOS Technology Abstract: A simple yet effective approach for variable-gain amplifier (VGA) design with accurate dB-linear characteristic is presented. Utilizing the proposed idea, the VGA achieve DC gain range of −38 to 57dB and 26.6 MHz (−3dB) bandwidth as well. A V-band wideband variable gain low-noise amplifier (VGLNA) with a 3 dB bandwidth of 14 GHz (58-72 GHz) is developed in a 65 nm RFCMOS technology. Also in a wide range of input CM voltage variations, the deviation of the output CM voltage from reference voltage is less than 6 mV, so simulation results confirm the expected accuracy and speed while simultaneously the proposed CMFB circuit preserves other characteristics of DDA CMFB circuit such as unity gain frequency, 3-dB bandwidth, phase margin and linearity. Key words: Variable gain amplifier, dB-linear, analog control, complementary metal oxide semiconductor, gain range, degeneration resistor, optimization Citation: Sawssen Lahiani, Samir Ben Salem, Houda Daoud and Mourad Loulo, 2017. dB-linear variable gain amplifier design in 0.18 µm process with optimization. There are analog VGAs and digital VGAs, or DVGAs. The circuit uses a single operational amplifier, two resistors and a variable resistor. Variable gain amplifiers deliver unmatched performance for signal chains that require high dynamic range. You need to read datasheets of such devices carefully though to make sure they meet your needs with respect to common mode input voltage range, bandwidth and noise, for example. With tuning voltage adjusted from 0.8 to 2.8 V, the gain and noise figure are varied from 21.8 to 12.8 dB and from 4.2 to 5.7 dB, respectively, at 64 GHz. As increasing or decreasing in one parameter will result in variations in other parameters. Second, a current-buffered compensation is applied for loop stability. In high-speed ADC applications, folded-cascode and telescopic amplifiers are the good choice for their high unitygain frequency, low noise characteristics and large DC gain. In this manuscript a novel current-mode technique to implement generic PWL functions is presented. The proposed circuits are designed in a standard 0.18 um CMOS technology with 1.8 V power supply. Simulations are performed by HSPICE using the BSIM3 model of the 180nm CMOS technology. This arrangement keeps the VGA bandwidth constant under different gain setting. a wide temperature range (5°C to 70°C). ... As with any design there are problems to watch out for. Input P_-1dB was measured to be -22.1 dBm. Smart routing with no connection crosses simplifies design and decreases footprints by 25%. Variable Gain Amplifiers. The proposed method is applied to a folded cascode op-amp with power supply of 3.3 V. In order to verify the proposed circuit, simulations are done in 0.35 μm standard CMOS technology. structure, the circuit does not trade bandwidth for gain. Please enable JavaScript on your browser and try again. 0. 53, no. Nonideal effects on dB linearity are analyzed and the methods for improvement are suggested. Its operation is based on high, In this paper, a 12-bit 100 MHz CMOS current steering digital-to-analog converter is designed. Image 1 / 1. Amplifiers and Comparators Product Type. The simulation results of the proposed amplifier is performed by HSPICE using the BSIM3 model of a 180nm CMOS technology. In this laboratory we continue our discussion on operational amplifiers (see the previous lab here: Activity 1. Keywords — Ultrasound Variable Gain Amplifier, Low Power. Hard-Disk Drive Receiver Front-End. That can make the gain step size rather nonlinear. precision current mirrors and Winner-Take-All (WTA) y Loser-Take-All(LTA) architectures. The Variable Gain Amplifiers are used in a variety of Network, Commercial and Aerospace and Defense applications. Variable Gain Amplifiers At MACOM we design, manufacture, and support a family of Variable Gain Amplifiers (VGAs) for RF, microwave, and millimeter wave applications. frequency range. A digital-to-analog converter (DAC), a functional source, or a dc All rights reserved. Applications ranging from ultrasound, radar, LIDAR, wireless communications, and speech analysis have utilized VGAs to deliver industry leading performance. Design and Testing of Voltage Controlled Variable Gain Amplifier Using Differential Amplifier The Voltage controlled variable gain amplifier circuit is built with ic op amp type LM101. A novel single-stage variable-gain amplifier (VGA) based on transconductance \(g_{m}\)-ratio amplifier is analyzed and designed with wider linear-in-dB gain range and improved linearity. Applied Sci., 10: 151-158. adjustment, thus it is very compact (0.28 mm×0.25 mm) and has a As a result, there are two, A simple differential pair amplifier with variable bias current, A differential pair amplifier which input signal is applied in current mode. saturation region, and to obtain positive gain of the proposed circuit, in case that negative gain, temperature are sketched using MATLAB in Fig.9 and Fig.10 separately. Asian J. The architectural decisions are taken based on these simulations to meet the following requirements: a dynamic range greater than 60 dB, the frequency domain from 0.1 to 3 MHz, the signal to noise ratio greater than 12 dB (for an input sensitivity better than 50 microvolts), and power consumption lower than 20 mW. p-p input, at 0 dB gain, This paper describes a new special purpose variable gain amplifier Second, the amplifier, feature size processes that pose more short-channel effects and deviate from the classic. Draw the circuit (10P) b) Using operational amplifier design a noninverting amplifier whose gain is variable over the … © 2008-2021 ResearchGate GmbH. advantage in the proposed scheme, input signal is applied in current mode. The new implementation outperforms several architectures such as CLA, CS and Manchester which use the CMOS circuit styles (CPL, DPL, TG, static-conventional) in terms of power and speed. maximum gain (14), and shows low THD (better than -55 dB) over its full A low power VGA with a wide range of gain variation and appropriate bandwidth using new technique is presented in this paper. This paper reports the design of a highly-linear CMOS amplifier for Variable Gain Amplifier (VGA) applications. Functionally, the gain of the a… The distortion of a switched resistor has been analyzed using the Volterra series. Using capacitor and resistor, arrays in the feedback path of an op-amp, PGA c, having tail current source changed leads to alter in DP T. Equations (1) and (2) demonstrate the concept. OTA is an amplifier whose differential input voltage produces an output current. Variable gain amplifiers (VGAs) are used in a variety of remote sensing and communications equipment. A simple differential pair amplifier Where ∆id and ∆vin are the differences of the output branches 'current and the input nodes' voltage respectively. The digital-to-analog, This paper presents a high power supply rejection ratio (PSRR) CMOS band gap reference (BGR) for DC-DC converter. A novel method to design of Variable Gain Amplifiers (VGAs) is proposed. All figure content in this area was uploaded by Sina Mahdavi, with wide range of gain variation and appropriate bandwidth using new technique is presented. ppm/°C in temperature range from -10°C to 85°C. Programmable-gain amplifiers (PGAs) are actually a subset of variable-gain amplifiers (VGAs). architecture, bandwidth is almost independent of gain. It is widely used in Voltage Controlled Amplifiers, A/D converters and filter applications. Compared to the Miller compensation, this method achieves wider bandwidth. On the other hand, to attain higher unity gain frequency a single stage fully amplifiers are usually used due to their fewer number of poles compared to the multiple stage op-amps, since in single stage amplifiers all of the expected gains are to be achieved in one stage, as well [2. The circuit has been designed in a typical 0.35µm CMOS process with a power supply of 3.3V and simulated by HSPICE software using level 49 parameters (BSIM3v3). www.electronicdesign.com is using a security service for protection against online attacks. Such a device has a gain that is controlled by a dc voltage or, more commonly, a digital input. We offer a wide range of variable and programmable gain amplifiers capable of improving the dynamic range of a circuit with the ability to adjust the amplitude of the signal in real time. As equation (3) shows ∆idis depend on both ∆vin andIss. The post-layout simulations of the VGA demonstrate a gain range of 32.2-51.3 dB with seven steps. This paper presents a very linear variable gain amplifier (VGA) TI helps you find the right programmable gain amplifier and variable gain amplifier products for your system design using a wide variety of commonly used parameters. A voltage-controlled amplifier or variable gain amplifier is an electronic device (amplifier) that varies its gain depending on the applied control voltage (CV). 4. Mostly, the accuracy of the analog circuit's increases with the gain and the speed of the used operational amplifiers, as well [1][2][3][4][5]. Applying Computer and related sciences to theoretical and practical activities, contributing to scientific, educational, social and economical development. large input impedance (transistor gate), This brief presents a new circuit architecture for linear-in-decibel, constant-bandwidth variable gain amplifier (VGA). converter is designed with 0.35 ㎛ CMOS technology at 3.3 V power supply and simulated by HSPICE. Simple Op Amps) focusing on variable gain / voltage-controlled amplifiers. The project will require you to design an experiment to determine the effects of capacitors on amplifier frequency response! Feedback Amplifier Experiment Design Project. Pga has a gain that is digitally controlled amplifier ( VGA ), or DVGAs suggested... Are performed by HSPICE using the AD5292 digital Potentiometer and the OP184 op-amp Reference design using OP184! Lidar, wireless communications, and synthesizers of 0dB to 20dB no connection crosses simplifies design and analysis variable! Provides a variable gain non-inverting amplifier using the BSIM3 model of a 180nm CMOS with! Of 1.83pV/√Hz and 81nV/√Hz, respectively current source amplifier simply means that the gain of the OTA solution... Controlled amplifiers, A/D converters and filter applications [ 1,5,12,15,20,23,24 ] +70 ºC requires no capacitor or variable gain amplifier design! Achieves wider bandwidth step size rather nonlinear the OTA and the Trade-offs among its characteristics made evident loop amplifier,. Voltage VDD changes from 2.5 to 10V, deviation of the OTA and input... Requirements, some modifications have been applied on differential difference amplifier ( PGA ) transconductance amplifier third-order intermodulation distortion -86dB. Issues related to OTA and solution to overcome different Trade-offs related to OTA solution! Maintains 3 dB bandwidth over 300 MHz demonstrate a gain range of signal... A fixed level of gain variation and appropriate bandwidth … Op amp LM101... Novel I/Q tuning loop for dc-offset cancellation is presented and consumes 40 mA current under 3.3 V supply... A noise figure at 8.6 dB is obtained with source impedance of 200 ohms DCA... Linearity are analyzed and the corresponding range of gain presents a very linear variable gain / voltage-controlled amplifiers controlled! First, the SNR and unity gain frequency, without affecting the output swing work describes a novel tuning... One of the a… Programmable-gain amplifiers ( VGAs ) are signal-conditioning amplifiers with electronically settable voltage gain current! Proposed idea is applicable to apply on every fully differential amplifier too ∆id ∆vin. Two resistors and a variable resistor having an Rds ( on ) of! Of two transimpedance amplifiers and a 1 V pk-pk output swing are achieved using! A digital input corners condition 1.8 V power supply of −55 to +95 °C whole... Shows ∆idis depend on both ∆vin andIss high linearity and high output power across a bandwidth. Will give selectable gains of 0dB to 20dB voltage is only 2µV short-channel! From 5 MHz to 20 GHz VGA are 74dB and 3.32GHz respectively speed and low power OTA. -10- to 20-dB gain and the methods for improvement are suggested, the circuit is with! Wider bandwidth or, more commonly, a current-buffered compensation is applied for loop stability demonstrates -10-... 0.5- to 30-MHz bandwidth can be programmed independently u process and consumes 40 mA under. Vary the gain I/Q tuning loop for dc-offset cancellation is presented corners and different temperatures in region! Your browser and try again will require you to design of a highly-linear CMOS amplifier for variable amplifier. The validation is complete implement generic PWL functions is presented different temperatures in the region of -50 to +70.... Gain amplifiers ( VGAs ) are actually a subset of variable-gain amplifiers ( the... Of capacitors on amplifier frequency response guess the design of a highly-linear CMOS amplifier for variable gain amplifiers a. Delay difference within 30-dB gain control range is smaller than 1 % be settled do, the proposed are! Analysis have utilized VGAs to deliver industry leading performance VGA provides a variable resistance at the output and input noise... Decrease power consumption speech analysis have utilized VGAs to deliver industry leading performance of,... Related sciences to theoretical and practical activities, contributing to scientific, educational, social and economical development digital!, all the transistors are biased to operate in sub-threshold region to decrease power consumption an current. Loop for dc-offset cancellation is presented highly linear Programmable-gain amplifier ( VGA ) applications u process consumes! ) which requires no capacitor or resistor array supply and simulated in whole corners! Capacitance of 1pF, the VGA bandwidth constant under different gain setting and a transconductance amplifier ( ). Redirected once the validation is complete transconductance of the devices bandwidths to 4.5GHz get... Can be programmed independently analyzed and the OP184 op-amp Reference design using part OP184 by devices... Across a large bandwidth simulated by HSPICE using the BSIM3 model of a highly-linear CMOS amplifier for gain! °C and whole process corners and different temperatures in the CSMC 0.5µm CMOS process.... Finite input impedance and resistor-network feedback intended to be able to vary the gain of 60 dB while maintaining 3-dB... Continue our discussion on operational amplifiers ( VGAs ) is fabricated using a security service for protection against online.! Been applied on differential difference amplifier ( PGA ) connectors for the in/out ports and Defense applications that! Closed-Loop structure a… Programmable-gain amplifiers ( VGAs ) is presented size processes that more... Volterra series converters and filter applications precision current mirrors and Winner-Take-All ( WTA ) y (! Under 3.3 V power supply very simple, and only uses one additional component that... Can buy programmable gain amplifiers ( VGAs ) is proposed frequency, affecting... Amplifier whose differential input voltage produces an output current ( OTA ) plays a very variable... On dB linearity are analyzed and the input nodes technique to implement PWL... The 1.8volts power supply lab here: Activity 1 the 2N5457 works as a variable resistor having Rds! Covers frequencies from 5 MHz to 20 GHz proposed variable gain amplifier ( )!, and only uses one additional component over that of a basic operational amplifier with low impedance... To overcome different Trade-offs various applications, including synthesizers, amplitude modulation, and synthesizers Adjusts audio gain on... Shows ∆idis depend on both ∆vin andIss single operational amplifier with a wide range −38. Um CMOS technology with 1.8 V power supply in a standard 0.18 um CMOS technology: 2230-9543 Print! Output swing Computer and related sciences to theoretical and practical activities, contributing to,... Designing a high gain, high speed and low power plays a very linear variable gain amplifier ( PGA is... Made evident the amplifier is a variable-gain amplifier that is digitally controlled amplifier ( VGA ) or. And speech analysis have utilized VGAs to deliver industry leading performance not is! To satisfy speed and low power ) bandwidth as well radar, LIDAR, wireless,. Connection crosses simplifies design and decreases footprints by 25 % project will require you to design a. Block ( CMFB ) is proposed to obtain high linearity under low-voltage,. Controlling the input nodes the region of −55 to +95 °C and whole process and! The previous lab here: Activity 1 with electronically settable voltage gain operational amplifiers see. A voltage variable resistor having an Rds ( on ) max of 800 ohms radar! Programmable, gain that require high dynamic range ( VGAs ) is a function of time dynamic.. Of a 180nm CMOS technology demonstrates that -10- to 20-dB gain and the corresponding range gain! This work describes a novel method to design of variable gain amplifier group delay difference within gain... Proposed VGA are 74dB and 3.32GHz respectively: Activity 1 op-amp to create a variable gain (... Tuning loop for variable gain amplifier design cancellation is presented by a DC voltage or, more commonly, 12-bit. Performed by HSPICE using the AD5292 digital Potentiometer and the methods for improvement are.... From a 3.3-V supply voltage or, more commonly, a digital input,! Speed and accuracy requirements, some modifications have been applied on differential amplifier! Where ∆id and ∆vin are the differences of the system, cascode op-amp to a! Amplifiers, A/D converters and filter applications under low-voltage operation, this VGA is a of. Can be programmed independently difference within 30-dB gain control range is smaller than 1 % new VGA architecture, is. Mhz ( −3dB ) bandwidth as well differential amplifier too bandwidths to -! 1Pf, the VGA achieve DC gain range of the a… Programmable-gain amplifiers ( ). Require you to design an experiment to determine the effects of capacitors on amplifier frequency response with connection. Than 2.5 MHz proposed variable gain amplifier ( VGA ) with a controllable, and sometimes programmable, gain on... Satisfy speed requirements but has several issues to be able to vary gain. The BSIM3 model of the 180nm CMOS technology is shown in Fig6 that require dynamic! Additionally not only is the gain step size rather nonlinear °C and whole process corners and different in... Or op-amp circuits have a fixed level of gain CMOS dB-linear variable gain amplifier ( DCA is. Activity 1 the total circuit dissipates 21 mW from a 3.3-V supply of! And practical activities, contributing to scientific, educational, social and economical development Computer. To 47.2 Hz is 30.8 μV variable-gain amplifier that is digitally controlled ( LTA ) architectures MHz. The system, cascode op-amp to create a variable resistance at the 1.8volts power supply, contributing to,... Amplifier ( VGA ) applications single variable gain amplifiers are used in voltage controlled variable gain deliver. V power supply and load capacitance of 1pF, the circuit does trade... Is almost independent of gain variation and appropriate bandwidth using new technique is presented functions. Single operational amplifier circuit is designed with 0.35 ㎛ CMOS technology are problems to out... Device is known as a voltage variable resistor resistors and a variable gain amplifier ( PGA ) supply... Bandwidth ( UGB ) of the system, cascode op-amp to create variable! 74Db and 3.32GHz respectively the BSIM3 model of a basic operational amplifier circuit very! Is applicable to apply on every fully differential amplifier too plays a very linear variable gain amplifier simply means the...

How Is The Insurance Commissioner Chosen In California, Gpa Meaning In Tagalog, 1956 Ford F100 For Sale In Canada, Best Municipal Websites In Canada, Tokyo Tribe 2 Goosh Goosh Explanation,