Floating-gate-based tunable CMOS low-voltage linear transconductorand its application to HF gm-C filter design

摘要

This paper presents a new CMOS low-voltage linear transconductornfor very high frequency. It uses multiple-input floating-gatentransistors in each inverter of the differential structurentransconductor presented by Nauta [1992]. The proposed transconductornoperates under a constant low-voltage supply as low as 1.2 V, and itsntransconductance and output resistance are independently tunable, asnshown by experimental measurements. This architecture is suitable fornuse in high-frequency continuous-time filters with programmable centernfrequency and quality factor. Simulation results of a 10.7-MHz and Q=40ngm-C filter operating with a voltage supply of 1.4 V and withnrail-to rail input swing are presented