Patent
Local oscillator with non-harmonic ratio between oscillator and RF frequencies using pulse generation and selection
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TLDR
In this article, the authors proposed a method of local oscillator (LO) generation with non-integer multiplication ratio between the local oscillators and RF frequencies, which avoids the harmonic pulling problem.Abstract:
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 input signal is fed to a synthesizer timed to a rational multiplier of the RF frequency L/N f RF . The clock signal generated is divided by a factor Q to form 2Q phases of the clock at a frequency of L(N*Q) f RF , wherein each phase undergoes division by L. The phase signals are input to a pulse generator which outputs a plurality of pulses. The pulses are input to a selector which selects which signal to output at any point in time. By controlling the selector, the output clock is generated as a TDM based signal. Any spurs are removed by an optional filter.read more
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TL;DR: In this article, a hybrid Cartesian/polar digital QAM modulator was proposed, which utilizes a combination of an all digital phase locked loop (ADPLL) that features a wideband frequency modulation capability and a digitally controlled power amplifier that features interpolation between 90 degree spaced quadrature phases.
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