Oscillators – Relaxation oscillators
Patent
1978-12-29
1980-12-23
Heyman, John S.
Oscillators
Relaxation oscillators
328134, 328 37, 331 48, H03K 526
Patent
active
042413087
ABSTRACT:
The frequency and phase of an output signal from an oscillator circuit are controlled with accuracy by a digital input word. Positive and negative alterations in output frequency are both provided for by translating all values of input words so that they are positive. The oscillator reference frequency is corrected only in one direction, by adding phase to the output frequency of the oscillator.
The input control word is translated to a single algebraic sign and the digital 1 is added thereto. The translated input control word is then accumulated. A reference clock signal having a frequency at an integer multiple of the desired frequency of the output signal is generated. The accumulated control word is then compared with a threshold level. The output signal is adjusted in a single direction by dividing the frequency of the reference clock signal by a first integer or by an integer different from the first integer.
REFERENCES:
patent: 3605026 (1971-09-01), Bowden
patent: 3728635 (1973-04-01), Eisenberg
patent: 4103251 (1978-07-01), Glick
patent: 4166249 (1979-08-01), Lynch
Cellier Alfred
Huey Douglas C.
Lovelace Alan M. Administrator of the National Aeronautics and Space
Ma Lit N.
Heyman John S.
Manning John R.
Matthews Marvin F.
Schlorff Russell E.
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