TTL output buffer with temperature compensated V.sub.oh clamp ci

Details TTL output buffer with temperature compensated V.sub.oh clamp ci TTL output buffer with temperature compensated V.sub.oh clamp ci

1991-04-01

1992-10-06

Laroche, Eugene R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307456, 3072966, H03K 1716

Patent

active

051534568

ABSTRACT:
A V.sub.OH clamp circuit reduces propagation delay time TP.sub.HL and reduces ground bounce noise in TTL output buffer circuits. First and second band gap bias generators (BG1,BG2) coupled in series provide a substantially stable clamp reference voltage level (V.sub.R) over a specified range of operating temperatures. The clamp reference voltage level (V.sub.R) is referenced to the low potential power rail (GND). Voltage drop components (D32,QC) of the Y.sub.OH clamp circuit couple the reference voltage level (V.sub.R) through the voltage drop components (D32,QC) to an internal node, namely the base node (BDAR) of the pullup Darlington configuration transistor pair (Q12A,Q12B), The V.sub.OH clamp circuit clamps the high potential level output signal (V.sub.OH) at a maximum voltage level (V.sub.OHMAX) less than the high potential level power rail (V.sub.cc), and referenced to the clamp reference voltage level (V.sub.R). The band gap bias generator circuit (BG1,BG2) establishes a substantially stable clamp reference voltage level (V.sub.R) approximately equal to the output signal maximum voltage level (V.sub.OHMAX). The V.sub.OH clamp circuit voltage drop components (D32,QC) establish a step up voltage drop approximately equal to the step down voltage drop across the pullup Darlington transistor pair (Q12A,Q12B).

REFERENCES:
patent: 4975603 (1990-12-01), Wise et al.
patent: 5036224 (1991-07-01), Wendell
patent: 5045724 (1991-09-01), Ovens et al.
Analysis and Design of Analog Integrated Circuits, by Paul R. Gray and Robert G. Meyer, Second Edition, John Wiley & Sons, 1984. Particular reference is made to Chapter 4, "Transistor Current Sources and Active Loads", Section A4.3.2 on Band Gap Referenced Biasing Circuits, pp. 289-296 and Section 4.2.2 on Widlar Current Source.

Affiliated with

Also associated with

Rating

TTL output buffer with temperature compensated V.sub.oh clamp ci does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with TTL output buffer with temperature compensated V.sub.oh clamp ci, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and TTL output buffer with temperature compensated V.sub.oh clamp ci will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1191442