Gain enhancement and input parasitic capacitance reduction of single-stage OTAs by using differential voltage combiners

Rui Santostavares,Edinei Santin,Rui Borrego,Juliano E Oliveira,Johannes Goes

MIXDES（2013）

引用 22|浏览4

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摘要

A new technique to enhance single-stage operational transconductance amplifiers (OTAs) is presented. Enhanced DC gain and reduced input parasitic capacitances are achieved by employing two input fully-differential voltage combiners, i.e. a combination of transistors in common-drain and common-source configurations operating as a preamplifier stage. Simulation results show that the input capacitance can be as small as 195 fF (corresponding to a 46 % reduction) while achieving a GBW of 1982 MHz (@ CL = 1 pF) with a PM of about 60°. The complete amplifier dissipates only 1.78 mW corresponding to a figure-ofmerit (FoM) of 1115 MHz·pF/mW.

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关键词

capacitance,combinational circuits,operational amplifiers,preamplifiers,dc gain,bandwidth 1982 mhz,common-drain configuration,common-source configuration,differential voltage combiners,gain enhancement,input parasitic capacitance reduction,power 1.78 mw,preamplifier stage,single stage ota,single-stage operational transconductance amplifier,common-drain,common-source,ota,single-stage,voltage-combiners,cmos integrated circuits,simulation,parasitic capacitance,common source,transistors,gain

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