Correctable output driver and method of using the same

Details Correctable output driver and method of using the same Correctable output driver and method of using the same

1997-10-08

1999-11-30

Tokar, Michael

Electronic digital logic circuitry

Interface

Current driving

326 31, H03K 190175

Patent

active

059949236

ABSTRACT:
A driver circuit is presented which can transition between output voltage levels at a high switching speed. The preferred output driver is a PECL driver having both a correction circuit portion and a drive circuit portion. The correction circuit senses changes in the base-to-emitter forward bias voltage V.sub.BE of drive transistors within the drive circuit. Thus, any change in performance of those drive transistors is replicated in the correction circuit, which then produces a compensating current. The compensating current is modulated by a reference voltage value, and mirrored to the drive circuit. The drive circuit includes not only differential input transistors and differential drive transistors, but also a resistor coupled to the base terminal of each drive transistor. The resistor receives the compensating current which then offsets any change in voltage level (V.sub.OH or V.sub.OL) produced at the output of the drive transistors. The compensating current and specifically the compensating current as reflected upon the drive transistor outputs offset any dependence upon the forward bias voltage of the drive transistor caused by, for example, temperature or fabrication skews.

REFERENCES:
patent: 4980579 (1990-12-01), McDonald et al.
patent: 5465057 (1995-11-01), Takahashi

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