A design approach for realizing high-frequency Gm-C continuous-time filters is proposed and a circuit implementation is presented. The design approach is based on reducing the effects of the finite impedance at each output node by placing a controlled output active load whose value is taken into account in the filter design. The implementation uses a BiCMOS high-efficiency fully-differential transconductor with an all-passive common-mode feedback. Simulation results of a biquadratic low-pass filter with cut-off frequency up to 82 MHz and load capacitance as large as 3 pF conclude the paper.
Baschirotto, A., Rezzi, F., Alini, R., Castello, R. (1994). Design of high-frequency BiCMOS continuous-time filters with low-output impedance transconductor. In 1994 IEEE international symposium on circuits and systems, vol 5: linear circuits and systems (lcs) - analog signal processing (asp) (pp.E665-E668). IEEE [10.1109/ISCAS.1994.409460].
Design of high-frequency BiCMOS continuous-time filters with low-output impedance transconductor
Baschirotto, A;
1994
Abstract
A design approach for realizing high-frequency Gm-C continuous-time filters is proposed and a circuit implementation is presented. The design approach is based on reducing the effects of the finite impedance at each output node by placing a controlled output active load whose value is taken into account in the filter design. The implementation uses a BiCMOS high-efficiency fully-differential transconductor with an all-passive common-mode feedback. Simulation results of a biquadratic low-pass filter with cut-off frequency up to 82 MHz and load capacitance as large as 3 pF conclude the paper.
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