Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Accelerating switching
Patent
1993-11-12
1996-06-18
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Accelerating switching
327 87, 327111, 327483, 327377, 326 17, H03K 17615, H03K 1700
Patent
active
055281923
ABSTRACT:
A bi-mode circuit for driving an output load selectively couples the output load to a supply voltage source or to a low discharge voltage source such as ground using switches which are controlled by an input buffer in response to an input signal. A high input signal closes a first switch to provide a biasing current to first and second current amplifiers to turn on a first output transistor which couples the output load to the low reference voltage to discharge the output load. Conversely, a low input signal closes a second switch to provide the biasing current to a third current amplifier to turn on a second output transistor which couples the output load to the supply voltage source. When the input signal becomes high, rapid pulldown of a capacitive output load is achieved using a high internal pre-drive current provided by the first and second current amplifiers, in a first mode of operation. As the output voltage decreases, turnoff of the first output transistor is prevented by switching to a second mode when the output voltage drops below a threshold value as determined by a comparator. The comparator effectively closes a third switch and thereby a loop which bypasses the first current amplifier to prevent the drive current from escaping the first current amplifier, so that the second current amplifier continues to amplify the biasing current to maintain the first output transistor on.
REFERENCES:
patent: 4480201 (1984-10-01), Jaeschke
patent: 4885486 (1989-12-01), Shekhawat et al.
patent: 4948991 (1990-08-01), Shucker et al.
patent: 5087834 (1992-02-01), Tsay
patent: 5124577 (1992-06-01), Davis et al.
patent: 5148056 (1992-09-01), Glass et al.
patent: 5289051 (1994-02-01), Zitta
Callahan Timothy P.
Le Dinh T.
Linfinity Microelectronics Inc.
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