Circuit with hysteresis and method using same

Details Circuit with hysteresis and method using same Circuit with hysteresis and method using same

1997-12-29

1999-09-14

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Parallel controlled paths

327206, H03K 3037

Patent

active

059528702

ABSTRACT:
An apparatus and method is provided with hysteresis for switching a load according to an input signal. There is a transfer gate for transferring a first signal to a second signal. A controller receives the first signal and the second signal and provides a control signal for the transfer gate. The control signal enables the transfer gate if the first signal reaches a first magnitude and disables the transfer gate if the first signal reaches a second magnitude. The control signal is obtained from a voltage divider across the first signal. A portion of the voltage divider is shorted out by a switch activated by a second signal. Thus, the control signal depends on the second signal. The apparatus is entirely powered by the second signal.

REFERENCES:
patent: 3723763 (1973-03-01), Udovic
patent: 3970869 (1976-07-01), Coats, Jr.
patent: 4928053 (1990-05-01), Sicard et al.
patent: 5161112 (1992-11-01), Guerra et al.
patent: 5475332 (1995-12-01), Ishimoto
patent: 5736890 (1998-04-01), Yee et al.

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