A Low Power Low Voltage Rail to Rail Constant gm Differential Amplifier with 150 dB CMRR and Enhanced Frequency Performance

Safari, Leila; Azhari, Seyed Javad

doi:10.22060/eej.2011.86

دانشگاه صنعتی امیرکبیر

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A Low Power Low Voltage Rail to Rail Constant gm Differential Amplifier with 150 dB CMRR and Enhanced Frequency Performance

AUT Journal of Electrical Engineering

مقاله 4، دوره 43، شماره 1، تابستان 2011، صفحه 35-44 اصل مقاله (488 K)

نوع مقاله: Research Paper

شناسه دیجیتال (DOI): 10.22060/eej.2011.86

نویسندگان

Leila Safari¹؛ Seyed Javad Azhari

¹Leila Safari is with Electronic Research Center, Iran University of Science and Technology (e-mail: leilasafari@yahoo.com).

²Corresponding Author, Seyed Javad Azhari is with Electrical Engineering Faculty of Iran University of Science and Technology (e-mail: Azhari@iust.ac.ir).

چکیده

This paper proposes a low voltage (±0.55V supply voltage) low power (44.65µW) high common mode rejection ratio (CMRR) differential amplifier (d.a.) with rail to rail input common mode range (ICMR), constant transconductance (gm) and enhanced frequency performance. Its high performance is obtained using a simple negative averaging method so that it cancels out the common mode input signals at the same input terminals while preserving high frequency operation. The principle of operation, small signal analysis and the formula of its most important parameters are explained and derived. Simulation results with HSPICE using TSMC 0.18µm CMOS are presented showing rail to rail operation, CMRR of 150dB, voltage gain of 31.6dB, gain bandwidth of 95.8 MHz and input referred noise of 100.64nv/√Hz. Compared to conventional amplifier ones those are 94.4dB , 3.4dB, 1.62 times and 1.72 times better, respectively. The CMRR corner case simulation results are also provided showing from 52.1dB to 74.6dB improvement over conventional one.

کلیدواژه ها

High CMRR Differential Amplifier؛ Low Voltage؛ low power؛ Rail to Rail؛ Quasi Floating Gate

عنوان مقاله [English]

A Low Power Low Voltage Rail to Rail Constant gm Differential Amplifier with 150 dB CMRR and Enhanced Frequency Performance

نویسندگان [English]

چکیده [English]

کلیدواژه ها [English]

High CMRR Differential Amplifier, Low Voltage, low power, Rail to Rail, Quasi Floating Gate

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