Double super-heterodyne receiver with low-pass and high-pass fil

Details Double super-heterodyne receiver with low-pass and high-pass fil Double super-heterodyne receiver with low-pass and high-pass fil

1996-05-31

1998-05-26

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455209, 455206, 455339, 455340, 333178, H04B 126

Patent

active

057582769

ABSTRACT:
A double super-heterodyne receiver has a high-frequency input circuit that includes a high-frequency amplifying device, a low-pass filter and a high-pass filter used for obtaining bandpass characteristics for the receiving band. A switching device for changing the cut-off frequency of, at least, the low-pass filter is further provided for the high-frequency input circuit. The switching device is controlled to be on or off in response to the receiving frequency, thereby changing the passband of the high-frequency input circuit. Image disturbance characteristics can thus be improved.

REFERENCES:
patent: 4939789 (1990-07-01), Sakashita et al.
patent: 5060297 (1991-10-01), Ma et al.
patent: 5222255 (1993-06-01), Kuo et al.
patent: 5428829 (1995-06-01), Osburn et al.

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