ZERO IF TRANSCEIVER

摘要

A zero Intermediate Frequency (IF) transmitter and receiver are implemented within a transceiver to eliminate interference in the receive band. An outpu t of a tunable high oscillator to generate a frequency source that is an integ er multiple of the desired transmit LO frequency. The frequency source is coupl ed to an amplitude limiter and frequency divider. The output of the frequency divider is used as the transmit LO to directly upconvert baseband signals to the desired output frequency without the need for an IF stage. Direct upconversion of the baseband transmit signals without an IF stage eliminates spurious frequency products that are produced in the receive band.