Generating transmit injection from receiver first and second injections
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United States of America Patent
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-
Aug 22, 1995
Grant Date -
N/A
app pub date -
Apr 1, 1991
filing date -
Apr 1, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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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