Fast start-up circuit

Details Fast start-up circuit Fast start-up circuit

1997-06-03

1999-04-06

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

327143, 327541, 327546, 323314, G05F 316

Patent

active

058923810

ABSTRACT:
The rise time of a voltage Vo presented to a load, based on an input voltage Vi provided via an RC filter coupled to the load for removing higher frequency noise on Vo, is substantially reduced by providing a sensor circuit with differential inputs Vi, Vo. The sensor circuit drives a charger circuit coupled to a DC potential and the load so that rapid charging of C to Vo does not depend on R. As Vo approaches Vi, the sensor circuit deactivates the charger circuit to stop further charging and a latch coupled to the sensor circuit shuts off the sensor circuit to reduce power consumption while (Vo.about.Vi)>0. A current mirror buffer is desirably included between the sensor output and the latch for level shifting.

REFERENCES:
patent: 5027053 (1991-06-01), Ohri et al.
patent: 5281866 (1994-01-01), Rundel
patent: 5317254 (1994-05-01), Olson
patent: 5698973 (1997-12-01), Goerke et al.
patent: 5734281 (1998-03-01), Morishima et al.

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