Power up and oscillator circuit using a single capacitor

Details Power up and oscillator circuit using a single capacitor Power up and oscillator circuit using a single capacitor

1990-05-30

1991-07-23

Mis, David

Oscillators

Solid state active element oscillator

Transistors

331108C, 331143, H03K 326

Patent

active

050347055

ABSTRACT:
A method for powering up an integrated circuit and circuit for implementing the method. A first charging current is used to slowly charge a capacitor used in the integrated circuit upon connecting the power. A power-up signal is provided to initialize digital circuitry until the first charging current raises the voltage of the capacitor above a threshold value. Once a capacitor is charged to another predetermined threshold, a second charging current is activated. The two charging currents are thereafter used as the total charging current on the capacitor. If the capacitor is grounded, the initial power-up scheme is re-initiated.

REFERENCES:
patent: 4947312 (1990-08-01), Tsuruoka et al.

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