Method of controlling filter time constant and filter circuit ha

Details Method of controlling filter time constant and filter circuit ha Method of controlling filter time constant and filter circuit ha

1990-10-03

1995-02-21

Kuntz, Curtis

Telecommunications

Transmitter and receiver at separate stations

455307, 455339, 455340, 333 171, 333172, 333174, 307521, H04B 110

Patent

active

053924568

ABSTRACT:
A method of controlling the time constant of a filter for use in a radio receiver which receives a signal, transmitted from a transmitting station at a predetermined period, intermittently at the predetermined period and demodulates and delivers the received signal, a filter circuit having the time constant control function based on the method, and a radio receiver having the filter circuit. Preferably, the filter has its time constant switchable stepwise and specifically, parallel connection of capacitors or shortcircuiting of resistors is controlled by turning on/off switches. A controller within the filter circuit or the radio receiver performs control for applying a predetermined periodical signal (or standard pulse signal) to the filter and controlling the time constant of the filter in accordance with an output signal (or triangular pulse) during a first time zone within each operation interval for the intermittent reception and for filtering the signal from the transmitting station and causing a demodulating circuit to demodulate and deliver a filtered signal.

REFERENCES:
patent: 4392068 (1983-07-01), Welles, II
patent: 4785253 (1988-11-01), Hughes
patent: 4818903 (1989-04-01), Kawano
patent: 5058204 (1991-10-01), Tahernia et al.
patent: 5101509 (1992-03-01), Lai
"On Chip Tuning for CMOS Continuous-Time Filter" Banu, M. et al., IEEE Int. Solid State Conference, Feb. 1985.

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