Title :
A switched-capacitor filter in 2 /spl mu/m CMOS using parallelism to sample at 80 MHz
Author :
Berg, S.K. ; Hurst, P.J. ; Lewis, S.H. ; Wong, P.T.
Author_Institution :
California Univ., Davis, CA, USA
Abstract :
Switched-capacitor filters (SCFs) are usually used in low-frequency applications, where the ratio of sample rate to corner frequency is high enough so that only simple anti-alias filters are required. At video bandwidths in CMOS technologies, however, op-amp settling time limits this ratio and increases the complexity of the anti-alias filter. Op amps and anti-aliasing are not needed with a continuous-time, transconductance-capacitor structure, but, this approach requires complex tuning. To avoid such tuning and to increase the sample-rate-to-corner-frequency ratio, this paper describes a prototype SCF that uses parallelism.<>
Keywords :
CMOS integrated circuits; active filters; linear integrated circuits; operational amplifiers; switched capacitor filters; 2 micron; 80 MHz; CMOS; corner frequency; op-amp settling time; parallelism; sample rate; sample-rate-to-corner-frequency ratio; switched-capacitor filter; video bandwidths; Band pass filters; CMOS technology; Delay; Finite impulse response filter; Frequency; Operational amplifiers; Poles and zeros; Prototypes; Switches; Transfer functions;
Conference_Titel :
Solid-State Circuits Conference, 1994. Digest of Technical Papers. 41st ISSCC., 1994 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-1844-7
DOI :
10.1109/ISSCC.1994.344725