VCO Gain and Injection-Locking to Measure Inductor Coupling on ICs
Peter Popplewell
Broschiertes Buch

VCO Gain and Injection-Locking to Measure Inductor Coupling on ICs

Using Oscillator Gain and Injection-Locking to Measure On-Chip Inductor Coupling

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The theoretical behavior of oscillators is explored using the -gm model. Mathematical derivations based on the model show that the frequency response of an LC oscillator resembles that of a high-Q bandpass filter with exceptionally high, but finite, pass-band gain. The linear derivations predict a 20 dB/decade roll-off beyond the loaded 3 dB corner frequency which is consistent with the accepted phase noise model of the oscillator. The demonstrated oscillator gain shows how oscillators can be used in non-traditional roles such as active filters or amplifiers. As an oscillator has gain within a...