Oscillators – Solid state active element oscillator – Transistors
Patent
1999-03-11
2000-07-18
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331143, H03K 30231
Patent
active
060913088
ABSTRACT:
A current-controlled oscillator includes a capacitor, and at least one current source for providing at least one charge current for charging the capacitor. A discharge circuit sequentially discharges the capacitor with a discharge current. A control circuit maintains a mean charge voltage of the capacitor at a preset value by controlling the discharge current. The control circuit includes a current control source forming a current mirror with the at least one current source. The current control source is connected to the discharge circuit for setting the discharge current substantially equal to a sum of the charge currents. The oscillator further includes a correction circuit for correcting the discharge current corresponding to a mean charge of the capacitor.
REFERENCES:
patent: 4161703 (1979-07-01), Nutz
patent: 5394020 (1995-02-01), Nienaber
IBM Technical Disclosure Bulletin, "Improved Clamp for Differential VCO and Single-Shot", vol. 10 (Jan. 1988), No. 8, pp. 237-238, Armonk, NY USA.
IEEE Journal of Solid-State Circuits, Sneep Et Al., "A New Low-Noise 100-MHZ Balanced Relaxation Oscillator", vol. 25 (Jun. 1990), No. 3, pp. 692-698, NY USA.
Galanthay Theodore E.
Grimm Siegfried H.
STMicroelectronics S.A.
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