Adjustable temperature-compensated threshold circuit with...

Details Adjustable temperature-compensated threshold circuit with... Adjustable temperature-compensated threshold circuit with...

2002-03-26

2003-04-08

Zweizig, Jeffrey (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C327S513000

Reexamination Certificate

active

06545511

ABSTRACT:

FIELD OF THE INVENTION
This invention generally relates to electronic systems and in particular it relates to adjustable temperature-compensated threshold circuits.
BACKGROUND OF THE INVENTION
The trip-points of threshold circuits typically lie within the given supply range in order to work properly. In today's market, though, the need for multi-functional pins is becoming more necessary as the IC's become increasingly pin and pad limited. With growing system integration and increasing silicon-packing densities, the package and its given pin-count become a limiting factor. As a result, the system can easily become pin limited.
SUMMARY OF THE INVENTION
A temperature compensated threshold circuit includes: a positive trip point circuit for providing a positive trip point when an input voltage is higher than a highest positive supply voltage; a negative trip point circuit for providing a negative trip point when the input voltage is below a lowest negative supply voltage; and a bias circuit for providing to the positive and negative trip point circuits a first current proportional to absolute temperature and a second current proportional to a base emitter voltage.


REFERENCES:
patent: 5111071 (1992-05-01), Kwan et al.

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