Oscillators – Automatic frequency stabilization using a phase or frequency... – With reference oscillator or source
Patent
1995-10-12
1997-06-10
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
With reference oscillator or source
331 2, 331 34, 331 57, 327105, 327145, 327146, 327151, H03L 706, H03L 718
Patent
active
056380283
ABSTRACT:
A circuit for generating a low power CPU clock signal is disclosed. The circuit includes a multi-frequency oscillator having a plurality of output signals of various frequencies that are input to a signal selector. The signal selector is controlled to route one of the various frequency signals to the output, which provides the CPU clock oscillating signal. The frequency of the CPU clock signal is compared against a reference oscillatory signal that is generated by a reference oscillator. Based upon the comparison, the frequency comparator generates an output signal that is used to control the signal selector to select an input signal of either higher or lower frequency, depending upon the comparison. Finally, an enable signal is provided for selectively enabling the operation of the CPU clock oscillating circuit.
REFERENCES:
patent: 4816776 (1989-03-01), Kessler
patent: 5063357 (1991-11-01), Williams et al.
patent: 5075640 (1991-12-01), Miyazawa
patent: 5315271 (1994-05-01), Pascual et al.
patent: 5389898 (1995-02-01), Taketoshi et al.
patent: 5406231 (1995-04-01), Jylha
Microsoft Corporation
Mis David
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