Actively regulated totem pole TTL output stage

Details Actively regulated totem pole TTL output stage Actively regulated totem pole TTL output stage

1997-02-24

1998-12-15

Callahan, Tim

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Accelerating switching

327108, 327482

Patent

active

058501584

ABSTRACT:
An all npn totem pole TTL output stage is provided with an active regulation circuit that continuously senses the voltage level at the output terminal and feeds it back to control the drive signal that is applied to the base of the bottom output transistor to switch the output state of the load quickly without wasting transient current and then scale back the drive signal during steady state operation to minimize wasted current. When the load is driven into its output low state, the active regulation initially holds the drive signal at a high level so that the load switches quickly. Once the output voltage has fallen low enough, the active regulation reduces the drive signal such that the bottom output transistor is held on the edge of conduction and does not saturate. In this state, the bottom output transistor pulls the output voltage down to approximately ground without conducting any appreciable amount of current. When the load is driven back into its high state, the bottom transistor is turned off before the top output transistor is turned on. This prevents transient drive current from being drawn from the voltage supply and returned directly to ground.

REFERENCES:
patent: 4514651 (1985-04-01), Miller et al.
patent: 5101124 (1992-03-01), Estrada
patent: 5287019 (1994-02-01), Nonaka et al.
patent: 5444395 (1995-08-01), Esgar
patent: 5572152 (1996-11-01), Ueda
patent: 5574391 (1996-11-01), Hanibuchi et al.
AD9054, "8-bit, 200 MSPS A/D Converter", Preliminary Data Sheet, Analog Devices, Inc., 1996, pp. 1-8 and 16.

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