IC (current-capacitor) precision oscillator having frequency and

Details IC (current-capacitor) precision oscillator having frequency and IC (current-capacitor) precision oscillator having frequency and

1997-06-09

1999-06-15

Kinkead, Arnold

Oscillators

Solid state active element oscillator

Transistors

331DIG3, 331175, 331143, 327131, 327132, 327134, 327135, H03K 300, H03B 500

Patent

active

059125934

ABSTRACT:
A precision oscillator circuit having a wide adjustable operating frequency range and an adjustable duty cycle. The precision oscillator use a window comparator circuit for monitoring a voltage of a capacitive element. The window comparator circuit has a first operating voltage edge and a second operating voltage edge wherein the first operating voltage edge latches an output signal of the window comparator circuit at one level when the voltage of the capacitive element is greater than the first operating voltage edge. The second operating voltage edge brings the output signal of the window comparator circuit back to an initial level when the voltage of the capacitive element is greater than the second operating voltage edge. A precision current reference source is coupled to the capacitive element and to the window comparator circuit. The precision current reference is used for generating currents which are insensitive to temperature, supply voltage, and process variations. The currents are used for charging and discharging the capacitive element. The currents are adjustable in order to vary an amount of time it takes to charge and discharge the capacitive element. This allows for the altering of the frequency as well as the duty cycle of the output signal of the window comparator circuit.

REFERENCES:
patent: 4983931 (1991-01-01), Nakano
patent: 5699024 (1997-12-01), Manlove et al.

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