Bandwidth switching circuits of radio receiver

Details Bandwidth switching circuits of radio receiver Bandwidth switching circuits of radio receiver

1977-11-10

1979-12-11

Richardson, Robert L.

325344, 325490, H04B 116, H04B 106, H04B 116

Patent

active

041785517

ABSTRACT:
A plurality of parallel branch paths are connected in an intermediate frequency or high frequency amplifying circuit of a radio receiver for the purpose of switching the bandwidth. Between an intermediate point of each branch path and the ground is connected output electrodes of a transistor, and the base electrode of the transistor is selectively connected to a source of control voltage via a transfer switch to render the selected transistor conductive.

REFERENCES:
patent: 3872387 (1975-03-01), Banach
patent: 3904968 (1975-09-01), Brinegar
patent: 3991374 (1976-11-01), Csicsatka et al.
patent: 4030036 (1977-06-01), Kusano
patent: 4045740 (1977-08-01), Baker
patent: 4124817 (1978-11-01), Takahashi

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