Transmitter and receiver circuits
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United States of America Patent
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Feb 2, 2016
Grant Date -
Aug 21, 2014
app pub date -
Nov 20, 2013
filing date -
Feb 20, 2013
priority date (Note) -
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Abstract
An RF transceiver apparatus has transmitter circuitry receiving transmission signals at a transmitter baseband frequency and converting the signals to a transmission frequency, and receiver circuitry receiving signals at a reception frequency and converting to a receiver baseband frequency. A first digital local oscillator and a first mixer convert between the transmitter baseband frequency and a transmitter intermediate frequency. A second digital local oscillator and a second mixer convert between a receiver intermediate frequency and the receiver baseband frequency. A third mixer frequency receives a local oscillator signal for frequency conversion between the transmitter intermediate frequency and the transmission frequency. A fourth mixer frequency receives a local oscillator signal for frequency conversion between the reception frequency and the receiver intermediate frequency. A third local oscillator produces an RF oscillator signal to the third mixer and the fourth mixer to provide the local oscillator signal.
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