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Abstract

Operations of a signal generator, which may be configurable to generate signals at one or more particular frequencies, may be controlled. The controlling may occur by setting frequency of an output of the signal generator by setting one or both of impedance and capacitance associated with the signal generator; and tuning the signal generator by applying one or more adjustments to the impedance and the capacitance associated with the signal generator, to maintain the set frequency. The signal generator may comprise a phase-locked loop (PLL), comprising a voltage controlled oscillator (VCO) for use in generating oscillating signals driving the generation of the PLL output. The VCO may be configurable to generate signals at varying frequencies, and may comprise at least one impedance element, at least one variable capacitance element and a plurality of tuning branches, where each tuning branch comprises at least a static capacitance element and a switching element.

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First Claim