Design and Analysis of Operational Transcondactance Amplifier (original) (raw)
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Design of Operational Transconductance Amplifier Using 0.35µm Technology
Operational transconductance amplifier (OTA) is one of the most significant building-blocks in integrated continuous-time filters. Here we design a two stage amplifier in TSMC 0.35µm technology with all the transistor in the saturation region. It has a output swing of VDD-2VDS, sat. The simulated output frequency response is shown for a supply voltage of 3.3V and 1.8V using IC studio in Mentor Graphics. DC gain is 48dB and 46dB, power consumption is 3.4mW and 23µW and slew rate is 26 V/µs and 2 V/µs for 3.3V and 1.8V respectively.
A Review of Different Architectures of Operational Transconductance Amplifier 1
2012
The outside world is of analog nature and to interact with computerized devices, we need analog and mixed signals along with Analog to Digital (A/D) circuits. Among various analog circuits, Operational Transconductance Amplifier (OTA) plays a very dominant role. OTA is an amplifier whose differential input voltage produces an output current. Its main characteristics are Gain, Unity Gain Bandwidth, Phase margin, Output swing, Slew rate, CMRR, PSRR and Offset etc. It is widely used in Voltage Controlled Amplifiers, A/D converters and filter applications. In this paper we discussed different architectures of the OTA and the Trade-offs among its characteristics made evident. Designing a high gain, high speed and low power consuming OTA is real challenge for the analog designers. As increasing or decreasing in one parameter will result in variations in other parameters. This paper identifies the different issues related to OTA and solution to overcome different Trade-offs.
Design and Analysis of Operational Transcondactance
2012
Differential amplifiers most important amplifier in the analog circuit design because of their outstanding performance as input amplifiers and the directly onward application with the possibility of feedback to the input. The traditional differential amplifier faces the disadvantage of the nonlinearity of the transfer characteristic, especially for large values of the differential input voltage amplitude. The differential amplifier circuit characterized in terms of commonmode rejection, voltage gain, and the power consumption. In this paper a Operational transconductance amplifier (OTA) using TSMC 0.18µm technology is designed. Operational transconductance amplifier (OTA) is one of the most significant building-blocks in integrated circuit. It has an output swing of VDD-3VDD. The simulated output for a supply voltage of 1V and 3 V using TSMC 0.18µm technology. DC gain is-4.47dB and-20.05 dB, power consumption is 0.1143mW and 4.395mW and delay is 9.93ns and 4.8 ns for 1V and 3V respectively.
A HIGH CMRR, LOW-POWER OPERATIONAL TRANSCONDUCTANCE AMPLIFIER WITH 0.18μM CMOS TECHNOLOGY
IASET, 2013
This paper represent an Operational Transconductance Amplifier (OTA) which is a basic building block in many analog circuit such as in data converter’s (ADC &DAC), biquad filter design and instrumentation amplifiers. This OTA is implemented using 0.18μm CMOS technology with cadence environment and it has ±1.25v power supply with biasing current of 33nA. OTA has been simulated with virtuoso simulator and simulation results are measured. Post layout simulations for a 1 pF load capacitance shows that OTA achieves a gain bandwidth of 270 KHz at a phase margin 68.43° with 90.27 dB DC gain. This OTA is having CMRR of 154 dB, PSRR of 119 dB, Power dissipation of 29.58nW and Slew Rate 2.49 V/μsec.
Analysis & Performance of Operational Transconductance Amplifier at 180nm Technology
IRJET, 2022
The performance analysis of a two-stage CMOS operational transconductance amplifier in conventional gate driven mode is presented in this paper. Theoretical computations as well as computeraided simulation analyses have been detailed. The designs were created using the TSMC 180nm CMOS process. 'Pyxis Schematic' was used for schematic simulations, while the simulator 'Eldo', version 11.2 of Mentor Graphics, was used for simulations. To begin, a DC analysis is used to determine all of the transistors' operating regions. All of the transistors are properly operating in the saturation zone, according to the results. Further AC research reveals that the Op Amp has a gain of 75 dB, a phase margin of 53.8, and a unity gain bandwidth of 30.5MHz. In addition, the input referred noise voltage is 0.0fV/Hz and the CMMR is 77.8dB. The slew rate is 0.37V/s, and the settling time is 472ns, according to transient analysis. Under 1.8V supply voltage, the output swings up to 1.25V, and the op-amp consumes 536.5W of power. The supply voltage is scaled to 1.5V and then to 1.2V to achieve a lowpower op-amp. With supply voltage scaling, large power savings of 18% and 35% can be achieved without compromising phase margin and slew rate, and only minor compromises in a few parameters like gain, UGB, and CMRR.
2016 UKSim-AMSS 18th International Conference on Computer Modelling and Simulation (UKSim), 2016
This paper presents low-voltage pseudo differential pair operational transconductance amplifier (OTA) circuit designed and simulated in 130 nm CMOS technology. The imperialist competitive algorithm (ICA) is used to optimize the DC gain, common-mode rejection ratio (CMRR), and power dissipation of the presented OTA. The cost function of ICA is evaluated in the form of simulation-based rather than equation-based to increase the precision of the final results. The simulation results after optimization show that the proposed OTA has DC gain of 37.5 dB, CMRR of 37.5 dB, and maximum signal swing at the output of 210 mV, with power consumption of 200μW from power supply of 0.5 V.
Design and Analysis of Operational Transconductance Amplifier
CiiT International Journal of Digital Signal Processing, vol. 3, Issue 7, July 2011, published by Coimbatore Institute of Information Technology, Coimbatore, India, ISSN: 0974 – 9705, Impact Factor: 0.126, 2011
This paper presents the implementation of operational transconductance amplifier using pspice. Spice is a general purpose circuit program that simulates electronic circuits and can perform various analysis of electronic circuits. So with the help of pspice, the analysis of operational transconductance amplifier has been proposed. In this paper, the circuit of operational transconductance amplifier is designed using JFET. The JFET is a symmetric device, however it is useful in circuit design to designate the terminals.
International journal of advanced research in electrical, electronics and instrumentation engineering, 2016
This paper deals with well-defined design criteria for ultra low power two stage CMOS operational transconductance amplifiers (OTAs) with simple yet robust implementation in nm dimension. A simple design approach which allows electrical parameters to be univocally related to each circuit element and biasing values for low frequency applications is presented.The operational transconductance amplifier with ±1.8v power supply has been simulated using TANNER Tools ver.13 with 0.18μm CMOS technology which provide expected characteristics with convenient performance for given specification.
2006 Ieee International Symposium on Circuits and Systems, 2006
In this paper we present an ultra-low voltage Here we report a more compact solution for a gate-input operational transconductance amplifier using gate-input OTA with intrinsic common-mode rejec-pMOS input devices and nMOS load devices with local tion. We use a pMOS input stage with nMOS loads common-mode feedback. This topology has a good intrinsic and local CMFB to provide good CM rejection. common-mode rejection. Simulations for a two-stage, 0.5 V fully differential operational transconductance amplifier A negative output conductance is further used to (OTA) with a gain of 55 dB and a common-mode rejection improve the differential-mode (DM) gain. ratio of 61 dB are reported. The amplifier consumes 77 pW OTAs are typically used in feedback applications, and has a gain-bandwidth product of 8.7 MHz when as shown in Fig. 1, with resistive, capacitive or designed in 0.18 pm CMOS technology. a combination of resistive and capacitive feedback and loading components. For a 0.5 V supply the