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A Low-Voltage Folded-Cascode OP Amplifier with a Dynamic Switching Bias Circuit

Authors:
Hiroo Wakaumi

Keywords: CMOS; operational amplifier; dynamic switching; switched capacitor circuit; filter

Abstract:
Wideband filters employing Operational Amplifiers (OP Amps) are required in sensing devices such as video cameras for environment sensing. A high-speed low-voltage Folded-Cascode (FC) OP Amp with a Dynamic Switching Bias (DSB) circuit capable of processing video signals, which enables low power consumption, high gain with wide bandwidths, and a wide dynamic range, was proposed. Through simulations, it was shown that the OP Amp with the reduced 3-V power supply is able to operate at a 14.3 MHz dynamic switching rate, allowing processing video signals, and a dissipated power of 57 % compared to that in the conventional 5-V power DSBFC OP Amp while keeping a 0.6 V wide output dynamic range. The response of the 2nd-order switched capacitor Low-Pass Filter (LPF) tested as its application was near the theoretical frequency response within frequencies below 5 MHz. The power dissipation of this LPF was also reduced to 56.8 % of that in the switched capacitor LPF with the conventional 5-V power DSBFC OP Amp.

Pages: 60 to 64

Copyright: Copyright (c) IARIA, 2018

Publication date: September 16, 2018

Published in: conference

ISSN: 2308-3514

ISBN: 978-1-61208-660-6

Location: Venice, Italy

Dates: from September 16, 2018 to September 20, 2018