Low-voltage op amp design and differential difference amplifierdesign using linear transconductor with resistor input

摘要

This paper describes a 1-V wide-input range and high linearityntransconductance input stage that uses poly resistor and input-impedancenboosting technique. Using the proposed transconductor, an op amp and andifferential difference amplifier (DDA) were implemented in a 1.2-ΜmnCMOS process. The transconductor has a total harmonic distortion (THD)nof less than -60 dB for an input swing of 400 mV at 10 kHz. The op ampnand the DDA show a peak-to-peak output swing of 800 mV and a THD of lessnthan -70 dB for an output swing of 600 mV at 10 kHz