Generating transmit injection from receiver first and second inj

Details Generating transmit injection from receiver first and second inj Generating transmit injection from receiver first and second inj

1991-04-01

1995-08-22

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 78, H04B 140

Patent

active

054448654

ABSTRACT:
A radio transceiver includes a first local oscillator (114) which is preferably a synthesizer providing a first LO signal, and a second local oscillator providing a second LO signal. The radio further includes a first mixer (110) for mixing the received RF signal and the first LO signal to produce a first IF signal having a frequency which is the difference of the two inputs. The first IF signal is then mixed with the second LO signal by a second mixer (124) where a second IF signal is produced which is preferably at zero frequency. During transmission, the radio uses a conventional modulator to modulate the second LO signal which is then mixed with the first LO signal by a transmitter offset mixer (112), where the output is a modulated RF signal.

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patent: 3825830 (1974-07-01), O'Connor et al.
patent: 4450583 (1984-05-01), Strobel et al.
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patent: 5263194 (1993-11-01), Ragan
I. Daroff "A Bulk CMOS 40-Channel CB frequency synthesizer", Nov. 1977, pp. 518-521 (IEEE, vol. CE-23, No. 4).

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