Fast, low output impedance, low-impedance, low-power clamp circu

Details Fast, low output impedance, low-impedance, low-power clamp circu Fast, low output impedance, low-impedance, low-power clamp circu

1997-02-20

1999-09-21

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327108, 327321, 327327, H03K 508

Patent

active

059559080

ABSTRACT:
A fast, low output impedance, low-power clamp circuit for a switched complementary emitter follower includes a current mirror circuit and two transistors. In operation, high current is provided to allow for fast switching when turning off the complementary emitter follower. When the complementary emitter follower has been turned off, the clamp circuit reverts to low-power operation requiring much lower current while maintaining the complementary emitter follower in the off condition.

REFERENCES:
patent: 4485352 (1984-11-01), Davies et al.
patent: 4533845 (1985-08-01), Bynum et al.
patent: 5488324 (1996-01-01), Mizuta et al.
patent: 5491437 (1996-02-01), Rincon et al.
"A 3 V CMOS Video Acquisition Channel," Katsu Nakamura et al., Analog Devices, Inc. and Sony Corporation, Presented at the Symposium on VLSI Circuits, Honolulu, HI, Jun. 1996, 2 pages.

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