Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Patent
1998-03-17
1999-03-30
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
455315, 455553, 455 86, H04B 140, H04B 126
Patent
active
058900519
ABSTRACT:
According to a second embodiment of the invention, a mobile phone receiver comprises a first down converter using a first local oscillator frequency which can be tuned in frequency steps by a programmable digital frequency synthesizer PLL which is locked to a reference frequency. The first down converter converts received signals to a first IF for filtering. A second down converter using a second local oscillator converts first IF signals to a second IF. The second local oscillator frequency is generated using a second digital frequency synthesizer PLL which locks the second oscillator to the reference frequency. A third down converter mixes the transmit frequency with the first local oscillator frequency to produce a lock frequency. A third digital frequency synthesizer PLL compares the lock frequency and the reference frequency to control generation of the transmit frequency.
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Boesch Ron
Gore Charles
Hadjichristos Aristotle
Schlang Jeffrey
Eisenzopf Reinhard J.
Ericsson Inc.
Orgad Edan
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