Transmit signal generation with the aid of a receiver

Details Transmit signal generation with the aid of a receiver Transmit signal generation with the aid of a receiver

1997-02-05

1999-12-28

Vo, Nguyen

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455260, 331 16, H04B 140

Patent

active

060093129

ABSTRACT:
A transceiver which generates transmit and receive channel frequencies using a single crystal reference oscillator is disclosed. A first and second local oscillator is connected to the crystal reference oscillator. A first down converter is connected to the first local oscillator which mixes a receive signal with a first local oscillator frequency to produce a first intermediate frequency signal. The first intermediate frequency signal is then amplified and filtered and applied to a second down convertor which mixes the filtered first intermediate frequency signal with a second local oscillator frequency to produce a second intermediate frequency. A transmit frequency offset is then generated using the second local oscillator frequency. A transmit frequency generator generates a transmit frequency using the transmit frequency offset and the first local oscillator frequency.

REFERENCES:
patent: 4027242 (1977-05-01), Yamanaka
patent: 4246539 (1981-01-01), Haruki et al.
patent: 4932072 (1990-06-01), Toko
patent: 5152005 (1992-09-01), Bickley
patent: 5493710 (1996-02-01), Takahara et al.
patent: 5594735 (1997-01-01), Jokura
patent: 5610558 (1997-03-01), Mittel et al.
patent: 5890051 (1999-03-01), Schlang et al.
"UHF Technology for the Cordless Revolution", Electronics World and Wireless World, vol. 99, No. 1688, Jul. 1, 1993, pp. 542-546.

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