Title :
Novel linearization circuit for BiCMOS transconductors used in high frequency OTA-C filters
Author :
Rezzi, F. ; Pisati, V. ; Castello, R. ; Alini, R.
Author_Institution :
Dept. of Electron., Pavia Univ., Italy
Abstract :
A novel linearization circuit for a tunable BiCMOS transconductor based on the emitter degeneration of bipolar devices is analyzed. The transconductor is suitable for high-frequency continuous-time filter implementations because of the large value of the gm/I ratio and its ease of tunability. An integrator cell with a unity gain bandwidth of up to 80 MHz can be realized with a capacitive load as large as 3 pF and a power consumption of about 3.5 mW. An extended tuning range can be achieved through the proposed linearization circuit that reduces the total harmonic distortion (THD) in the lower part of the tuning range. Simulation program with IC emphasis (SPICE) simulation results are presented, comparing the classical solution with respect to the linearized one; the input stage shows an output current THD less than 1% for an input differential signal of up to 500m Vpp over an almost 10:1 tuning range
Keywords :
BiCMOS analogue integrated circuits; SPICE; circuit analysis computing; continuous time filters; digital simulation; harmonic distortion; integrating circuits; 3 pF; 35 mW; 80 MHz; BiCMOS transconductors; SPICE; capacitive load; continuous-time filter implementations; emitter degeneration; high frequency OTA-C filters; input differential signal; integrator cell; linearization circuit; output current THD; power consumption; total harmonic distortion; tunability; unity gain bandwidth; Bandwidth; BiCMOS integrated circuits; Circuit optimization; Energy consumption; Filters; Integrated circuit modeling; SPICE; Total harmonic distortion; Transconductors; Tunable circuits and devices;
Conference_Titel :
Circuits and Systems, 1993., ISCAS '93, 1993 IEEE International Symposium on
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-1281-3
DOI :
10.1109/ISCAS.1993.393904
