Wristwatch receiver architecture

Details Wristwatch receiver architecture Wristwatch receiver architecture

1988-06-30

1989-12-05

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Combined with diverse art device

455 45, 455234, 455302, H04B 106

Patent

active

048858021

ABSTRACT:
A wristwatch FM subcarrier paging receiver architecture is disclosed that overcomes the many inherent problems (such as self-oscillation, image responses, spurious local oscillator radiation and interference from entertainment programming) that are encountered in this demanding application. The disclosed architecture includes a tunable notch filter front end, an image cancelling mixer, an automatic gain control circuit, a phase detector for linear detection, frequency feedback for distortion reduction, a synthesized local oscillator, and a frequency plan which can utilize both high and low side local oscillator injection to optimize performance in anticipated interference environments.

REFERENCES:
patent: 4419770 (1983-12-01), Yagi et al.
patent: 4713808 (1987-12-01), Gaskill et al.
"Radio Engineering," Terman, 1947, pp. 752-755.
"Solid State Radio Engineering," 1980, pp. 286, 295-297, Krauss et al.
T. Okanobu et al., A Complete Single Chip AM/FM Radio Integrated Circuit, Aug. 1982, IEEE Trans. on Consumer Electronics, vol. CE-28, No. 3, pp. 393-408.

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