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Local oscillator with non-harmonic ratio between oscillator and RF frequencies using digital mixing and weighting functions
Local oscillator with non-harmonic ratio between oscillator and RF frequencies using digital mixing and weighting functions
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机译:使用数字混频和加权功能在振荡器和RF频率之间具有非谐波比率的本地振荡器
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摘要
A novel and useful apparatus for and method of local oscillator (LO) generation with non-integer multiplication ratio between the local oscillator and RF frequencies. The LO generation schemes presented are operative to generate I and Q square waves at a designated frequency while avoiding the well known issue of harmonic pulling. The signal is input to a synthesizer timed to a rational multiplier of the RF frequency fRF. The signal is then divided to generate a plurality of phases of the divided signal. A plurality of combination signals are generated which are then multiplied by a set of weights and summed to cancel out some undersired products. The result is filtered to generate the LO output signal.
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