Oscillators – Automatic frequency stabilization using a phase or frequency... – With reference oscillator or source
Patent
1998-05-29
2000-11-21
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
With reference oscillator or source
331 1A, 331 8, 331 12, 331 16, 331 17, 331 36C, 331179, 327 9, 327 12, 327105, 327156, 327159, 455260, H03B 508, H03L 706, H03L 7087, H03L 7091, H03L 716
Patent
active
061508918
ABSTRACT:
The synthesis of high-frequency signals, such as wireless communication signals, includes a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage controlled oscillator (VCO) that has a discretely variable capacitance in conjunction with a continuously variable capacitance. The discretely variable capacitance may provide coarse tuning adjustment of the variable capacitance to compensate for capacitor and inductor tolerances and to adjust the output frequency to be near the desired frequency output. The continuously variable capacitance may provide a fine tuning adjustment of the variable capacitance to focus the output frequency to match precisely the desired frequency output. During fine tuning adjustment, the PLL may be controlled by a plurality of analog control signals. The analog control signals may be derived by first generating a plurality of phase shifted signals from a divided version of the VCO output clock by using a shift register. The shift register may be clocked by another clock signal at a higher frequency than the divided version of the VCO output clock. The phase differences between the plurality of phase shifted signals and a divided version of a reference clock may then be detected and converted to the analog control signals.
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Wang Caiyi
Welland David R.
Mis David
Silicon Laboratories Inc.
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