Clock oscillator for a cardiac pacer having frequency compensati

Details Clock oscillator for a cardiac pacer having frequency compensati Clock oscillator for a cardiac pacer having frequency compensati

1984-08-30

1986-06-10

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Transistors

331111, 331176, 128422, H03K 357, H03L 102

Patent

active

045945659

ABSTRACT:
A temperature and voltage stable clock circuit for use in implantable cardiac pacers employs CMOS devices to minimize current drain. The circuit includes a timing capacitor which is alternately charged to and discharged between two established threshold voltages during respective charge and discharge cycles, the periods of which determine the clock frequency. To render the frequency of the clock circuit independent of changes in capacitor charge and discharge currents brought about by changes in temperature, the threshold voltage is increased with temperature so that the charge and discharge cycles remain constant. To render the frequency of the clock circuit independent of changes in the power supply voltage, a Wilson current source is used to maintain a constant charge and discharge current to the timing capacitor.

REFERENCES:
patent: 3995232 (1976-11-01), Laugesen
patent: 4365212 (1982-12-01), Gentile et al.
patent: 4370628 (1983-01-01), Henderson et al.
patent: 4453834 (1984-06-01), Suzuki et al.

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