Circuit for receiving and transmitting signals and method

Details Circuit for receiving and transmitting signals and method Circuit for receiving and transmitting signals and method

1998-08-04

2000-10-24

Tsang, Fan

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 82, 455 76, 375344, 375219, H04B 140

Patent

active

061379972

ABSTRACT:
A circuit (30) and method for translating a spectrum of a modulated signal. The circuit (30) includes a mixer (33), a summing device (36), and a synthesizer (37). The circuit (30) receives and transmits modulated Radio Frequency (RF) signals. The synthesizer (37) generates a transmitter modulated RF signal (TX.sub.RF) using a modulating signal (TX.sub.MOD). The mixer (33) generates an intermediate frequency signal (IF) by mixing a receiver modulated RF signal (RX.sub.RF) with the transmitter modulated RF signal (TX.sub.RF). The summing device (36) removes modulation of the transmitter modulated RF signal (TX.sub.RF) by combining the intermediate frequency signal (IF) with the modulating signal (TX.sub.MOD).

REFERENCES:
patent: 5001776 (1991-03-01), Clark
patent: 5142551 (1992-08-01), Borth et al.
patent: 5355524 (1994-10-01), Higgins, Jr.
patent: 5493583 (1996-02-01), Cripps
patent: 5734970 (1998-03-01), Saito
patent: 5977835 (1999-11-01), Huang
patent: 5987074 (1999-11-01), Wakamatsu
patent: 5991605 (1999-11-01), Rapeli

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