Direct digital synthesizer for producing a modulated intermediat

Details Direct digital synthesizer for producing a modulated intermediat Direct digital synthesizer for producing a modulated intermediat

1992-08-25

1994-04-05

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 86, H04B 140

Patent

active

053013670

ABSTRACT:
A synthesizer for a radio transceiver uses a Direct Digital Synthesis (DDS) system (3) to provide a modulated signal for the transmitter section. The modulated signal (So) is then mixed in a mixer (4) using a signal from a local oscillator (1) to provide the signal for transmission. The reference frequency for the DDS system is provided by the local oscillator (1) of the receiver section. The local oscillator is used to provide the signal for the mixer (4).

REFERENCES:
patent: 4449250 (1984-05-01), Kurby
patent: 4792939 (1988-12-01), Hikita et al.
patent: 4878035 (1989-10-01), Vendely et al.
patent: 5008900 (1991-04-01), Critchlow et al.
patent: 5010585 (1991-04-01), Garcia
patent: 5045817 (1991-09-01), Sheffer
patent: 5111162 (1992-05-01), Hietala et al.

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