Title :
An accurate center frequency tuning scheme for 450-KHz CMOS Gm -C bandpass filters
Author :
Yamazaki, Hiroshi ; Oishi, Kazuaki ; Gotoh, Kunihiko
Author_Institution :
Fujitsu Labs. Ltd., Kawasaki, Japan
fDate :
12/1/1999 12:00:00 AM
Abstract :
This paper describes a center frequency tuning technique for a second intermediate-frequency (IF) bandpass filter. The utilization of the step signal response ensures the direct measurement of the center frequency. This tuning technique guarantees the accuracy of the design. A 450-kHz Gm-C bandpass filter tuned using this technique has been developed to integrate the IF module for personal digital cellular (PDC) handsets for use in 0.35-μm CMOS. The filter with the tuning scheme achieves a center frequency accuracy of ±0.5%
Keywords :
CMOS analogue integrated circuits; band-pass filters; circuit tuning; continuous time filters; step response; 0.35 micron; 450 kHz; CMOS Gm-C bandpass filter; IF module; center frequency tuning; personal digital cellular handset; step signal response; Band pass filters; CMOS technology; Circuit optimization; Cutoff frequency; Energy consumption; Frequency measurement; Master-slave; Phase locked loops; Tuning; Uncertainty;
Journal_Title :
Solid-State Circuits, IEEE Journal of
