Off-line bootstrap startup circuit

Details Off-line bootstrap startup circuit Off-line bootstrap startup circuit

1993-10-25

1995-12-19

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327110, 315411, 348730, 363 20, 363 21, 363 49, 363 97, H03L 700

Patent

active

054771757

ABSTRACT:
A novel off-line bootstrap startup circuit (10) including a high voltage device (100) for providing an initial bias voltage to an integrated circuit (IC) is provided. The high voltage device includes an NMOS transistor (102) having a high source to ground breakdown voltage thereby extending a bias voltage range provided to the IC. This bias voltage range may be needed to support large comparator (303) hysteresis and allow for an unregulated bias voltage. The bootstrap startup circuit becomes inoperative when the bias voltage exceeds a predetermined value.

REFERENCES:
patent: 4799138 (1989-01-01), Chahabadi et al.
patent: 5014178 (1991-05-01), Balakrishnan
patent: 5051611 (1991-09-01), Kantz
patent: 5111070 (1992-05-01), Murphy et al.
patent: 5189600 (1993-02-01), Keck et al.
patent: 5285369 (1994-02-01), Balakrishnan
patent: 5291387 (1994-03-01), Ohshima
patent: 5313381 (1994-05-01), Balakrishnan

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