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A full Differential Operational Amplifier for ∑△ Modulator

FU Xing-hua

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Abstract

By comparing gain- boosting folded cascode, folded cascode and A/A class telescopic cascode structures of operational amplifiers, a full differential operational amplifier structure was proposed, which can be widely used to a variety of high order∑△ modulator . The design of full differential telescopic cascode operational amplifier with the CMFB circuit was designed in SIMC 0.35μm CMOS technology. The simulation results showed that the DC gain of the amplifier is 84.5 dB. The unity- gain bandwidth is 199 MHz and the phase margin is 51°.

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What this paper is about

By comparing gain- boosting folded cascode, folded cascode and A/A class telescopic cascode structures of operational amplifiers, a full differential operational amplifier structure was proposed, which can be widely used to a variety of high order∑△ modulator . The design of full differential telescopic cascode operational amplifier with the CMFB circuit was designed in SIMC 0.35μm CMOS technology. The simulation results showed that the DC gain of the amplifier is 84.5 dB. The unity- gain bandwidth is 199 MHz and the phase margin is 51°.

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Available abstract

By comparing gain- boosting folded cascode, folded cascode and A/A class telescopic cascode structures of operational amplifiers, a full differential operational amplifier structure was proposed, which can be widely used to a variety of high order∑△ modulator . The design of full differential telescopic cascode operational amplifier with the CMFB circuit was designed in SIMC 0.35μm CMOS technology. The simulation results showed that the DC gain of the amplifier is 84.5 dB. The unity- gain bandwidth is 199 MHz and the phase margin is 51°.

Key concepts: Cascode, Operational amplifier, Phase margin, Operational transconductance amplifier, Fully differential amplifier, Direct-coupled amplifier, Electronic engineering, Amplifier

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