A method to generate stable transconductance (g m) without using precise external components is presented. The off-chip resistor in a conventional constant-g m bias circuit is replaced with a variable on-chip resistor. A MOSFET biased in triode region is used as a variable resistor. The resistance of the MOSFET is tuned by a background tuning scheme to… (More)
— The design and performance of a switched-R-MOSFET-C filter is presented in this paper. The filter achieves-77dB THD using a 0.6V supply, and-90dB THD using a 0.8V supply, with a 0.6Vpp differential 2kHz sine input. High linearity at a low supply voltage is achieved by the use of duty-cycle controlled tuning inside a feedback loop.