Oscillators – Frequency stabilization
Patent
1988-06-02
1990-01-09
Laroche, Eugene R.
Oscillators
Frequency stabilization
331 57, 307310, H03L 100
Patent
active
048930962
ABSTRACT:
An oscillator circuit comprising an oscillator with a CMOS gate. A suitably proportioned CMOS gate consumes power only when its gate output, assumed to be capacitively loaded, is charged. Therefore, a relation can be deduced between an oscillation frequency of the oscillator and a ratio of the voltage across the CMOS gate and the conducted current. The actual oscillator is included in a circuit so that this ratio remains substantially constant and becomes substantially independent of temperature variations. To achieve this, the oscillator is included in a first current branch having a first current source. A second current branch comprising a second current source in series with a resistance is arranged parallel to the first current branch. The current sources supply currents in a fixed ratio. The current branches are coupled to one another by means of control means for controlling the current sources so that the ratio of a voltage across the CMOS gate and a voltage across the resistance is constant.
REFERENCES:
patent: 4414515 (1983-11-01), Suzuki et al.
patent: 4473762 (1984-09-01), Iwahashi et al.
Carr, How to Design Oscillator Circuits, Radio-Electronics, 58(1), Jan. 1987, p. 65.
Franzblau Bernard
LaRoche Eugene R.
Pascal Robert J.
U.S. Philips Corporation
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