Transient suppression circuit for a time domain duplex transceiv

Details Transient suppression circuit for a time domain duplex transceiv Transient suppression circuit for a time domain duplex transceiv

1990-08-29

1993-06-22

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455315, H04B 144

Patent

active

052222535

ABSTRACT:
A radio transceiver is coupled to a source of a reference waveform, and includes transmit mode receive modes. The transceiver comprises a first down mixer, a first low pass filter coupled the first down mixer, and a first selective coupling switch. The first down mixer is coupled to receive an input signal having an input frequency, for mixing the input signal with the reference waveform to produce a first signal. The first signal has a frequency substantially lower than the input frequency. The first low pass filter is coupled the first down mixer for producing a filtered first signal. The first selective coupling switch couples the first down mixer and the low pass filter when the radio transceiver is in the receive mode, and decouples the first down mixer and the low pass filter when the radio transceiver is in the transmit mode, thus substantially eliminating transient disturbances.

REFERENCES:
patent: 3665507 (1972-05-01), Peil
patent: 4287599 (1981-09-01), Goncharoff et al.
patent: 4385402 (1983-05-01), Barrs
patent: 4476585 (1984-10-01), Reed
patent: 4653117 (1987-03-01), Heck
patent: 4761829 (1988-08-01), Lynk, Jr. et al.
patent: 4837853 (1989-06-01), Heck
patent: 4885801 (1989-12-01), Hansen
patent: 4903257 (1990-02-01), Takeda et al.
patent: 4955039 (1990-09-01), Rother et al.

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