Design of Rail-to-Rail op-amp in 90nm technology

Author(s):

P R Pournima , BNMIT

Keywords:

Bias generation, Class AB amplifier, Current Summing Circuit, Op-amp, Rail-to-Rail.

Abstract:

The output swing, dynamic range and the input common mode range of an operational amplifier are critical parameters of its performance in high power applications such as Bandgap reference circuits. It has been observed that these parameters reduce with advanced technology nodes and with lower supply voltages. With special biasing circuit, it is possible to raise the output swing and also common mode voltage. This paper presents a two stage, Rail to rail Operational Amplifier with Miller compensation and biasing circuit with a supply voltage of 1.2V in 90 nm CMOS technology. The design was carried out keeping in view the requirement of a Bandgap reference with a temperature coefficient of 1.34 ppm. The proposed design achieves a swing of 1.2V with a gain of 14 and UGB of 787 MHz. The physical design was carried out using Virtuoso tools for Custom IC design and physical verification with Assura toolset from Cadence®

Other Details:

Manuscript Id	:	IJSTEV1I2014
Published in	:	Volume : 1, Issue : 2
Publication Date	:	01/09/2014
Page(s)	:	38-44

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