Voltage threshold detection circuit

Details Voltage threshold detection circuit Voltage threshold detection circuit

1997-09-29

2000-05-09

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Slope control of leading or trailing edge of rectangular or...

327108, 327379, H03K 512, H03K 1716

Patent

active

060609214

ABSTRACT:
An output buffer is provided in which the output impedance of the buffer is set relatively low during an initial portion of an output transition. Subsequently, near the end of the output transition, the output impedance of the buffer is increased to more closely follow the characteristic impedance of a transmission line driven by the buffer. The output impedance is automatically changed when the buffer output voltage crosses a predetermined threshold. The output buffer includes a voltage threshold detection circuit comprising a diode and a transistor, the diode being coupled to the gate of the transistor. When a voltage level of a signal applied to one of the diode and the transistor crosses a predetermined threshold, a switch state of the diode and/or transistor changes to thereby change an output of the voltage detection circuit and trigger the change of output impedance of the output buffer in a reliable and consistent manner.

REFERENCES:
patent: 5293082 (1994-03-01), Bathaee
patent: 5306965 (1994-04-01), Asprey
patent: 5512854 (1996-04-01), Park
patent: 5537070 (1996-07-01), Risinger
patent: 5610548 (1997-03-01), Masleid

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