Title :
Design of a 4 MHz sixth-order CMOS Bessel filter with 80-100 ns tunable delay
Author :
Schaumann, R. ; Wu, P. ; Latham, P.
Author_Institution :
Dept. of Electr. Eng., Portland State Univ., OR, USA
Abstract :
The design and the experimental evaluation of sixth-order, fully differential, CMOS transconductance-C Bessel filter are presented. The filter consists of a cascade connection of three biquads, each built with grounded capacitors and four identical differential linear operational transconductance amplifiers (OTAs) using the current subtraction technique. It realized a constant delay of nominally τ=85 ns over a 4-MHz bandwidth and its delay τ was electronically adjustable by varying one bias current. The filter operates on ±2.5-V supplies, dissipates 30 mW of power, had a peak linear differential voltage swing of 4 V and a dynamic range of approximately 70 dB
Keywords :
CMOS integrated circuits; active filters; delays; linear integrated circuits; operational amplifiers; -2.5 V; 2.5 V; 30 mW; 4 MHz; 80 to 100 ns; CMOS Bessel filter; bias current; biquads; cascade connection; current subtraction technique; differential linear OTA; electronically adjustable; fully differential; operational transconductance amplifiers; sixth-order; transconductance-C; tunable delay; Bandwidth; Capacitors; Delay; Differential amplifiers; Dynamic range; Nonlinear filters; Operational amplifiers; Subtraction techniques; Transconductance; Voltage;
Conference_Titel :
Circuits and Systems, 1992. ISCAS '92. Proceedings., 1992 IEEE International Symposium on
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-0593-0
DOI :
10.1109/ISCAS.1992.230489
