Communications receiver having a switchable filter input stage

Details Communications receiver having a switchable filter input stage Communications receiver having a switchable filter input stage

1982-03-01

1984-03-06

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455190, 455197, 455315, 455340, 455284, 333176, 333103, 333132, H04B 126, H03H 700

Patent

active

044358415

ABSTRACT:
A multichannel communications receiver, e.g. a CATV converter, includes a switched filter for reducing third order intermodulation distortion by limiting the number of channels processed by the receiver. In a preferred embodiment, the filter is switchable between a highpass and a lowpass configuration by a control signal supplied to two switching diodes. The input and output of the filter are coupled by a mutual inductance which partially compensates for the effect of parasitic inductance at higher frequencies.

REFERENCES:
patent: 2136659 (1938-11-01), Wood
patent: 2307979 (1943-01-01), Whisk
patent: 3514727 (1970-05-01), Matsumoto et al.
patent: 3980957 (1976-09-01), Putzer
patent: 4002986 (1977-01-01), Ma
patent: 4247953 (1981-01-01), Shinagawa et al.
patent: 4322856 (1982-03-01), Ohta et al.

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