Title :
Design of high-frequency BiCMOS continuous-time filters with low-output impedance transconductor
Author :
Baschirotto, A. ; Rezzi, F. ; Alini, R. ; Castello, R.
Author_Institution :
Dipartimento di Elettronica, Pavia Univ., Italy
fDate :
30 May-2 Jun 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 3pF conclude the paper
Keywords :
BiCMOS analogue integrated circuits; biquadratic filters; circuit feedback; continuous time filters; low-pass filters; 3 pF; 82 MHz; BiCMOS fully-differential transconductor; active load; all-passive common-mode feedback; biquadratic low-pass filter; circuit design; cut-off frequency; high-frequency continuous-time filters; load capacitance; output impedance; simulation; BiCMOS integrated circuits; Cutoff frequency; Feedback; Frequency response; Impedance; Low pass filters; Parasitic capacitance; Performance analysis; Transconductors; Transfer functions;
Conference_Titel :
Circuits and Systems, 1994. ISCAS '94., 1994 IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-1915-X
DOI :
10.1109/ISCAS.1994.409460
