Supply voltage insensitive charge/discharge type oscillator and

Details Supply voltage insensitive charge/discharge type oscillator and Supply voltage insensitive charge/discharge type oscillator and

1997-12-24

1999-08-10

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331143, 331175, 365222, H03K 303, H03K 3354

Patent

active

059364793

ABSTRACT:
An oscillator circuit is described which produces a periodic oscillator output signal. The frequency of the oscillator output signal is essentially independent of the supply voltage provided to the oscillator circuit. The oscillator circuit includes a capacitor which is periodically charged and discharged. A high trip point inverter and a low trip point inverter detect the voltage level of the capacitor and set and reset, respectively, a flip-flop. The flip-flop produces an output signal which controls the charge and discharge of the capacitor through charging and discharging circuit paths, respectively. The impedance presented by the charging and discharging circuit paths varies as a function of the supply voltage, such that the high and low trip point inverters are switched at a frequency which is essentially independent of the supply voltage magnitude. The oscillator output signal is derived from the flip-flop output signal.

REFERENCES:
patent: 5070311 (1991-12-01), Nicolai
patent: 5668508 (1997-09-01), Pulvirenti et al.

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