Design of a high frequency low voltage CMOS operational amplifier (original) (raw)

Design of High Gain Low Voltage CMOS Operational Amplifier

This paper presents a design of High gain two stage CMOS operational amplifier, which operates at ±2.5V power supply using tsmc 1um CMOS technology. The OPAMP designed has two-stages and a single ended output and is designed to exhibit a gain bandwidth of 12MHz, gain of 81.52dB with a 62 degree phase margin and 45 degree gain margin to work with a load capacitance of 10pF and have power dissipation 0.7mW. The Operational Amplifier is designed using RC Compensation for stability. Design and Simulation has been carried out in P Spice.

Design of Low Voltage two Stage CMOS Operational Amplifier

International Journal of Advance Research, Ideas and Innovations in Technology, 2018

The method that presented in this paper is to design a low voltage CMOS operational amplifier, which operates at the ±1V power supply. Due to this, the demand for low voltage silicon chip systems has been increased. The supply voltage is scaled down to reduce the overall power consumption of the system. The objective of this project is to design a low voltage CMOS operational amplifier. The designed OP-AMP is a two-stage CMOS OP-AMP which exhibits a gain of 59.50 dB, the phase margin of 79.431 and unity gain bandwidth is 7.717 KHz. Design and Simulation have been carried out in LT Spice tools.

Design Of Two Stage CMOS Operational Amplifier in 180nm Technology With Low Power and High CMRR

—-In this paper a CMOS two stage operational amplifier has been presented which operates at 2.5 V power supply at 0.18 micron (i.e., 180 nm) technology and whose input is depended on Bias Current. The supply voltage has been scaled down to reduce overall power consumption of the system. The main aim of our work is to decrease power dissipation .At large supply voltages, there is a trade-off among speed, power and gain. Performance of any circuit depends upon speed, power and gain. This op-amp has very low standby power consumption with a high driving capability and operates at low voltage so that the circuit operates at low power. The op-amp provides a gain of 36.747dB and a-3db bandwidth of 7.33 kHz and a unity gain bandwidth of 16.54 MHz for a load of 3 pF compensation capacitor & 10 pF load Capacitor. This op-amp has a PSRR (+) of 179.3dB , Common Mode gain of-102.4 dB, with a high CMRR of 133.69 dB and an output slew rate of 12.5 v/μs. The power consumption for the op-amp is .804mW.

Design Method for Two-Stage CMOS Operational Amplifier Applying Load/Miller Capacitor Compensation

COMPUTATIONAL RESEARCH PROGRESS IN APPLIED SCIENCE & ENGINEERING (CRPASE), 2020

CMOS operational amplifiers (Op-amp) are present integral components in various analog circuit systems. Adding frequency compensation elements is the only critical solution for avoiding Op-amp instability. This article presents a designed two-stage CMOS Op-amp using a miller capacitor, a nulling resistor, and a common-gate current buffer for compensation purposes. All the design parameters of the proposed Op-amp were determined based on the corresponding equations of gain, slew rate, phase margin, power dissipation, etc. In order to verify the parameter values, the developed Op-amp circuit was simulated in HSPICE, possessing two critical characteristics: Op-amp with miller capacitor and a robust bias circuit. Afterwards, the expected values from the theoretical section were compared with simulation results thus proving that the advanced method in this paper was validly designed and implemented. This technique promises a real-world scale Op-amp with high unity-gain, excessive input common-mode range voltage, reasonable gain bandwidth, and a practicable slew rate.

Design of high gain low power operational amplifier

2016 International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT), 2016

In this paper we are going to design a two stage CMOS operational amplifier and to analyses its behavior by performing AC analysis using tsmc 130nm technology of mentor graphics tool. Generally Op-Amp is an electronic device that produces high gain which is required in almost all the applications. All the analog circuit fabrication processes are using Op-Amp as the basic component. Thus it is essential to make sure that op-amp must operate very effectively. So we try to increase the gain of op-amp by using two stages with CMOS realization. Here CMOS is used since it provides less power dissipation and requires only 5V as input for biasing. We are modifying the existed design by placing a current source in place of biasing circuit and operating all the components in saturation region only. Thus, we are accomplishing the function of biasing circuit with a current mirror circuit. Also, the area used to fabricate the circuit is also less as we are reducing the number of MOS transistors used to design the circuit. Hence this two stage Op-Amp produces high Gain, Phase Margin. The simulation results are provided by using mentor graphics tool showing the graphs of gain, phase margin and the slew rate.

Design and Analysis of a Two Stage Operational Amplifier for High Gain and High Bandwidth

Australian journal of basic and applied sciences, 2012

In this paper a design and comparison between a fully differential RC Miller compensated CMOS op-amp and conventional op-amp is presented. High gain enables the circuit to operate efficiently in a closed loop feedback system, whereas high bandwidth makes it suitable for high speed applications. A novel RC Miller compensation technique is used to optimize the parameters of gain and bandwidth for high speed applications are illustrated in this research work. The design is also able to address any fluctuation in supply or dc input voltages and stabilizes the operation by nullifying. The design is implemented on TSMC 0.18 m CMOS process at 3.3 V as supply voltage under room temperature 27 C. The simulated result shows that a unity gain bandwidth of 136.8 MHz with a high gain of 92.27 dB is achieved for the proposed op-amp circuit. The total areas of the layouts are 0.000158 mm 2 and 0.000532 mm 2 for conventional and proposed respectively.

An improved frequency compensation technique for CMOS operational amplifiers

Solid-State Circuits, IEEE Journal of, 1983

A high performance low power CMOS channel falter," IEEE J. Solid-State Circuits,vol. SC-15, pp. 921-929, Dec. 1980, D, Senderowicz, D. Hodges, and P, Gray, "High-performance NMOS operational amplifier," IEEE J. So[id-State Circuits,vol. SC-13, pp. 760-766, Dec. 1978. Kevin E. Brefnner (S'79-M80) received the B.S.E.E. degree from the University of Michigan, Ann Arbor, in 1980 and is currently working on the M.S.

TECHNOLOGY Design and Performance analysis of Low power CMOS Op-Amp

2013

This paper proposes a low power CMOS operational amplifier which operates at 1.8 V power supply. The unique behavior of the MOS transistors in sub-thres hold region not only allows a designer to work at l ow input bias current but also at low voltage. While operating th e device at weak inversion results low power dissip ation but dynamic range is degraded. Designing of two-stage Op-Amp is a multi-dimensional optimization problem where optimization of one or more parameters may easily r esult into degradation of others. The Op-Amp is des igned to exhibit a unity gain frequency of 17.3 MHz and exh ibits a gain of 62.04dB. The proposed design uses a smaller compensation capacitor (CC), which improves the slew rate and also, benefits for the area of compensat ion circuit. In order to verify the viability two-stage Op-Amp a t SCNO 180 nm CMOS technology is designed and verified and power consumption is reduced.

Design and Performance analysis of Low power CMOS Op-Amp.

International Journal of Engineering Sciences & Research Technology, 2013

This paper proposes a low power CMOS operational amplifier which operates at 1.8 V power supply. The unique behavior of the MOS transistors in sub-threshold region not only allows a designer to work at low input bias current but also at low voltage. While operating the device at weak inversion results low power dissipation but dynamic range is degraded. Designing of two-stage Op-Amp is a multi-dimensional optimization problem where optimization of one or more parameters may easily result into degradation of others. The Op-Amp is designed to exhibit a unity gain frequency of 17.3 MHz and exhibits a gain of 62.04dB. The proposed design uses a smaller compensation capacitor (CC), which improves the slew rate and also, benefits for the area of compensation circuit. In order to verify the viability two-stage Op-Amp at SCNO 180 nm CMOS technology is designed and verified and power consumption is reduced.

Design of a Low Power Two Stage Operational Amplifier using MT-CMOS Technology: A New Approach

IJARCCE

The birth of "Moore"s Law" provided a great insight to electronic industry. As a result of which so many technologies are adapted to increase the number of components on integrated circuits. One of which is Scaling .As scaling of technology is adapted, performance and efficiency of devices is improved to a great extent. But on the other hand power dissipation has become a matter of great concern. And it becomes the main constrain when it comes to portability of any electronic device. The operational amplifiers need no introduction as this device has become an integral part of fields like instrumentation, automotive and so on. So, this paper is proposing a design of a low power operational amplifier using MT-CMOS Technology. Various technologies for low power dissipation are also considered in this paper along with their advantages and disadvantages.