Oscillators – With frequency calibration or testing
Patent
1996-07-24
1998-07-14
Grimm, Siegfried H.
Oscillators
With frequency calibration or testing
331 66, 331 68, 331176, H03L 100
Patent
active
057810737
ABSTRACT:
A temperature compensation apparatus for an oscillator includes an oscillator having an output for generating a clock signal with a frequency identical to the oscillating frequency of the oscillator, a memory for storing a frequency compensation lookup table based on the relationship between output frequencies of the oscillator and the environmental temperature variations, a temperature detector for detecting the environmental temperature variations, a central processing unit for selecting a rating output frequency of the oscillator, acquiring a frequency compensation value from the frequency compensation lookup table stored in the memory in response to a detected environmental temperature, and converting the frequency compensation value into a corresponding compensation signal, and a compensation circuit receiving an output signal of the oscillator and a compensation signal from the CPU for compensating a deviation between the output frequency of the oscillator and the rating frequency and outputting a frequency signal close to the rating frequency of the oscillator.
REFERENCES:
patent: 4746879 (1988-05-01), Ma et al.
patent: 5604468 (1997-02-01), Gillig
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