Class AB emitter follower buffers

Details Class AB emitter follower buffers Class AB emitter follower buffers

1999-04-26

2000-11-28

Tokar, Michael

Electronic digital logic circuitry

Function of and, or, nand, nor, or not

Bipolar transistor

326 92, H03K 19018

Patent

active

061540633

ABSTRACT:
Buffers having an output pull-up transistor controlled by the input signal, an output pull-down transistor and a pull-down transistor control circuit. A current source provides a current that is divided between the pull-up transistor and the pull-down transistor control circuit to maintain the desired output voltage. A boost capacitor is coupled between the output and the pull-down transistor control circuit to provide good dynamic response to the circuit even in the presence of substantial capacitive loads on the output. In addition a second capacitor is coupled between the pull-down transistor control circuit and a fixed voltage to provide a low frequency pole internal to the circuit. The connection of the boost capacitor to the pull-down transistor control circuit and the connection of the second capacitor to the pull-down transistor control circuit are separated by a substantial resistance, allowing the effect of each capacitor to be substantially independent of each other. Exemplary circuits are disclosed incorporating these and other features.

REFERENCES:
patent: 4071783 (1978-01-01), Knepper
patent: 4443715 (1984-04-01), Fox
patent: 4677313 (1987-06-01), Mimoto
patent: 5028818 (1991-07-01), Go Ang et al.
patent: 5451903 (1995-09-01), Armstrong
patent: 5874858 (1999-02-01), Furuya

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