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A Telescopic Fully Differential Amplifier with CMFB Circuit

Guofeng Wu

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Abstract

Based on Chartered 0.35 μm process,a telescopic fully differential amplifier with CMFB circuit was designed.The circuit was composed of a telescopic amplifier,a biasing circuit and a CMFB circuit.Simulation results showed that the amplifier had an open-loop gain of 79.4 dB,a unity-gain bandwidth of 179 MHz,and a phase margin of 75.5° at a capacitive load of 3 pF,and it dissipated a power of 2.31 mW.Moreover,a new open-loop gain test circuit was proposed to accurately test low frequency gain of the fully differential operational amplifier.Finally,the tape-out amplifier was tested and analyzed,and results indicated that the proposed amplifier achieved its design goal in general.

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What this paper is about

Based on Chartered 0.35 μm process,a telescopic fully differential amplifier with CMFB circuit was designed.The circuit was composed of a telescopic amplifier,a biasing circuit and a CMFB circuit.Simulation results showed that the amplifier had an open-loop gain of 79.4 dB,a unity-gain bandwidth of 179 MHz,and a phase margin of 75.5° at a capacitive load of 3 pF,and it dissipated a power of 2.31 mW.Moreover,a new open-loop gain test circuit was proposed to accurately test low frequency gain of the fully differential operational amplifier.Finally,the tape-out amplifier was tested and analyzed,and results indicated that the proposed amplifier achieved its design goal in general.

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Available abstract

Based on Chartered 0.35 μm process,a telescopic fully differential amplifier with CMFB circuit was designed.The circuit was composed of a telescopic amplifier,a biasing circuit and a CMFB circuit.Simulation results showed that the amplifier had an open-loop gain of 79.4 dB,a unity-gain bandwidth of 179 MHz,and a phase margin of 75.5° at a capacitive load of 3 pF,and it dissipated a power of 2.31 mW.Moreover,a new open-loop gain test circuit was proposed to accurately test low frequency gain of the fully differential operational amplifier.Finally,the tape-out amplifier was tested and analyzed,and results indicated that the proposed amplifier achieved its design goal in general.

Key concepts: Fully differential amplifier, Direct-coupled amplifier, Phase margin, Instrumentation amplifier, Operational transconductance amplifier, Current-feedback operational amplifier, Operational amplifier, Open-loop gain

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