Oscillators – Solid state active element oscillator – Transistors
Patent
1998-05-29
2000-10-24
Kinkead, Arnold
Oscillators
Solid state active element oscillator
Transistors
331177V, 331167, 331108C, 331 36C, 331 1A, 455260, 455262, H03L 708
Patent
active
061373729
ABSTRACT:
A method and apparatus for synthesizing high-frequency signals is disclosed that overcomes integration problem associated with prior implementations while meeting demanding phase noise and other impurity requirements. In one embodiment, a phase-locked loop (PLL) frequency synthesizer is disclosed having a voltage controlled oscillator (VCO) with a variable capacitance that includes a discretely variable capacitance in conjunction with a continuously variable capacitance. The discretely variable capacitance may provide coarse tuning adjustment of the variable capacitance, and the continuously variable capacitance may provide a fine tuning adjustment of the variable capacitance. In a more general terms, a frequency synthesizer is disclosed having a first variable and a second capacitance circuits and frequency control circuitry to coarsely tune the output frequency by adjusting the first control signal and to finely tune the output frequency by adjusting the second control signal.
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Kinkead Arnold
Peterman Brian W.
Silicon Laboratories Inc.
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