Gallium-Arsenide JFET Op-Amp with High Open-Loop Gain

Prokopenko, N.; Chumakov, Vladislav; Pakhomov, I. V.; Bugakova, Anna V.; Denisenko, Darya; Vialikov, I. L.

doi:10.1109/telfor52709.2021.9653228

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Computer Simulation Of Gaas Op-amp With Vos Compensation1

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2023

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“…Fig. 11 shows an operational amplifier developed by GaAs based on identical JFET current dynamic loads [7].…”

Section: Computer Simulation Of Gaas Op-amp With Vos Compensationmentioning

confidence: 99%

The Concept of Designing BiJT Operational Amplifiers for Anti-aliasing Active LPF with a Low Level of Systematic Component of the Zero Offset Voltage

Chumakov¹,

Serebryakov²,

Titov³

et al. 2022

Preprint

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The zero offset voltage in anti-aliasing low-pass filters (LPF) included at the ADC input has a significant effect on the effective bit rate of the ADC. The article discusses methods for minimizing the systematic component of the zero offset voltage (VOS) of operational amplifiers (Op-Amp) in the structure of the LPF, due to the degradation of the current gain of the base (b) of bipolar transistors for an extremely common subclass of Op-Amp with one high-impedance node. The methods of matching a high-impedance Op-Amp node and a buffer amplifier with the help of special correcting SCMp and SCMn multipolars are proposed. Methods of description and formation of the given coefficients of weak current asymmetry of typical Op-Amp functional units (current mirrors, input DS, buffer amplifiers, SRC, etc.) are presented. As an example, the results of computer simulation of GaAs Op-Amp with small VOS performed on JFET field and p-n-p bipolar transistors are given.

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“…Fig. 11 shows an operational amplifier developed by GaAs based on identical JFET current dynamic loads [7].…”

Section: Computer Simulation Of Gaas Op-amp With Vos Compensationmentioning

confidence: 99%