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A Doppler radar based on a phase locked self-injection oscillator is presented for vital-sign detection. The phase-locked loop (PLL) stabilizes the output frequency and serves as the demodulator. The architecture has a well defined operating frequency compared to a free-running self-injection oscillator. A frequency domain model is developed to calculate the circuit parameters for desired sensitivity...
This study presents injection-pulling effects on a local oscillator (LO) for wireless applications. A discrete-time analysis is provided to predict output spectra of the LO pulled by a sinusoidal and angle-modulated injection signal. A phase-locked loop synthesizer with an injection signal is analyzed in frequency domain to account for the inherent bandpass filtering on the injection signal. In addition,...
This study presents injection pulling effects on a local oscillator (LO) for wireless applications. A phase-locked loop under injection is analyzed in frequency domain to account for the inherent band-pass filtering on an injection signal. A discrete-time analysis is also provided to predict output spectra of the LO pulled by a sinusoidal and modulated injection signal. Comparison between theoretical...
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