CR-type oscillator circuit

Details CR-type oscillator circuit CR-type oscillator circuit

1990-06-27

1991-01-08

Pascal, Robert J.

Oscillators

Solid state active element oscillator

Transistors

331143, H03K 300

Patent

active

049839314

ABSTRACT:
A CR-type oscillator circuit of the invention includes a reference resistor; a current mirror circuit for taking out the current flowing in the reference resistor; and a reference capacitor whose charging and discharging is repeated by the current taken out by the current mirror circuit within a predetermined potential changing range which is determined by a resistor divider network formed by a plurality of resistors connected in series. The oscillator circuit further includes a control circuit for maintaining at a constant value the ratio between the potential changing range of the charging and discharging of the reference capacitor and the potential difference developed across the reference resistor. The CR-type oscillator circuit of the invention generates stable oscillation frequency which has no dependency on the power supply voltages or the threshold voltages of the transistors concerned.

REFERENCES:
patent: 4590444 (1986-05-01), Wilcox
patent: 4904960 (1990-02-01), Izadinia et al.

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