Single chip radio receiver with one off-chip filter

Details Single chip radio receiver with one off-chip filter Single chip radio receiver with one off-chip filter

1989-07-11

1991-07-09

Kuntz, Curtis

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

34082544, 455340, H03J 1500

Patent

active

050312332

ABSTRACT:
The present invention provides an improved single chip radio receiver which has less external components than do previous similar receivers. With the present invention the integrated circuit which includes the radio receiver also has an on-chip adaptive filter. The radio receiver is designed for use in a radio pager which is only active for a very short time slot during a relative long repeat cycle. Thus the adaptive filter only need remain stable for a short period after its coefficients are adjusted to the desired values. The radio receiver includes an external filter which has the same frequency response as desired from the adaptive filter. Immediately prior to activating the radio receiver, the circuit is activated to adjust the parameters of the adaptive filter so that the adaptive filter matches the external filter. The radio receiver is then activated using both filters in series thereby producing the desired radio reception. The adaptive filter quickly changes characteristics; however, since the radio receiver is only active for a short period of time, operation of the system is not affected.

REFERENCES:
patent: 4177430 (1979-12-01), Paul
patent: 4528698 (1985-07-01), Fraser
patent: 4761829 (1988-08-01), Lynk, Jr. et al.
patent: 4885801 (1989-12-01), Hansen
patent: 4885802 (1989-12-01), Ragan
"A Complete Single Chip AM/FM Radio IC" Okanobu et al 6/82.
Continuous-Time Adaptive Recursive Filters, Johns et al, pp. 667-670, 1989 IEEE.

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