The Operational Amplifier (Op-Amp) is a fundamental building block in Mixed Signal design. Two stage Op-Amp is one of the most commonly used Op-Amp architectures. In this paper an operational amplifier by CMOS is presented whose input depends on bias current which is 30uA and designed using 1 um technology. In sub-threshold region due to unique behaviour of the MOS transistors not only allows a...

The objective of this paper is to design a Low-Voltage, Low-Power and High-Gain Operational Amplifier used for high speed compensated CMOS op-amp which specifies open loop circuit parameters to obtain enhanced gain, settling time and closed loop stability An Op-Amp is designed in a 0.18 μm standard digital CMOS Technology The low noise high speed Op-Amp is designed using 180nm CMOS technology a...

Abstract—In this paper, a two-stage op-amp design is considered using both Miller and negative Miller compensation techniques. The first op-amp design uses Miller compensation around the second amplification stage, whilst the second op-amp design uses negative Miller compensation around the first stage and Miller compensation around the second amplification stage. The aims of this work were to ...

A digitally programmable rail-to-rail CMOS operational amplifier (Op Amp) is designed using standard 0.35 um CMOS process. By using an efficient MOS capacitor is used to compensate the stability of the Op Amp. A compensation current switch is used to adjust the slew rate. Using the schemes, the Op Amp can obtain improved the stability, bandwidth, slew rate and settling time according to the out...

Abstract: This paper presents a new methodology for design of high speed CMOS operational amplifier in Sub-micron region. The opamp uses a compensation technique which increases the unity gain frequency and phase margin simultaneously. The CMOS op-amp presented in this paper works on 1.5V designed in 65nm standard CMOS technology. It exhibits 86dB DC gain. With load of 5pF, the unity gain frequ...

Operational amplifiers are an integral part of many analog and mixed signal systems. As the demand for mixed mode integrated circuits increases, the design of analog circuits such as operational amplifiers in CMOS technology becomes more critical. This paper presents a two stage CMOS operational amplifier, which operates at ±1.8V power supply using TSMC 0.18um CMOS technology. The OP-AMP design...

This paper presents the design and performance comparison of a two stage operational amplifier topology using CMOS and BiCMOS technology. This conventional op amp circuit was designed by using RF model of BSIM3V3 in 0.6 μm CMOS technology and 0.35 μm BiCMOS technology. Both the op amp circuits were designed and simulated, analyzed and performance parameters are compared. The performance paramet...

In low voltage low power CMOS systems the high input offset and noise voltages of MOSFETs and the moderate gain of op amps limit the accuracy of analog circuits. In this paper we summarize the results ofour recent research on the dynamic op amp matching which is a very attractive technique for the implementation of accurate analog circuits in low voltage low power CMOS systems because, in compa...

A CMOS voltage controlled Op-Amp oscillator based on N-stage single-ended chain of different inverter types is described in this paper. This paper describes a performance and comparison of a ring oscillator based VCO and an Op-Amp based oscillator based VCO. The VCO is intended to operate in a op-amp based VCO to generate local oscillator frequency for an system. An oscillator topology an impro...

This paper presents the design, analysis, and simulated results of a three stage low power op-amp in a 0.25μm CMOS process technology. The op-amp overcomes the problems of cascading stages under low supply voltage by using modified active-feedback frequency compensation. This op-amp operates over a common-mode voltage (Vcm)from 0 to 0.6V, a supply voltage (Vdd) of 1.5V ±5%, a temperature range ...