Buffer circuit for regulating driving current

Details Buffer circuit for regulating driving current Buffer circuit for regulating driving current

1995-09-26

1996-10-22

Hudspeth, David R.

Electronic digital logic circuitry

Interface

Current driving

326 21, 326 34, 326 83, 327264, H03K 19003

Patent

active

055680682

ABSTRACT:
A buffer circuit with driving current adjusting function is provided which may automatically set a driving current characteristics of a buffer to the most suitable value according to a system where the driving current is to be applied. A buffer circuit with driving current adjusting function of the present invention comprises a buffer circuit which is controlled by a control signal for supplying a most appropriate driving current to a load; a load detecting circuit for detecting a phase difference between an input signal and an output signal of the buffer circuit and for outputting voltage corresponding to the phase difference, a control signal generating circuit for generating a signal which controls the driving current of the buffer circuit in response to an output signal of the load detecting circuit, the control signal controls so that the driving current of buffer circuit is increased when delay time of buffer circuit becomes long and the driving current of buffer circuit is decreased when delay time becomes short.

REFERENCES:
patent: 4719369 (1988-01-01), Asano et al.
patent: 5107230 (1992-04-01), King
patent: 5134311 (1992-07-01), Biber et al.

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