Temperature-compensated voltage level sense circuit

Details Temperature-compensated voltage level sense circuit Temperature-compensated voltage level sense circuit

1993-04-29

1994-11-15

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 91, 327 94, 327 77, H03K 524

Patent

active

053651294

ABSTRACT:
A voltage level sense circuit that has temperature compensation is disclosed. The circuit includes charge-sharing capacitors in each of an input leg and a reference leg. The charge-sharing capacitors are precharged to voltages that are integral multiples of the forward bias voltage drop across the base-emitter junction of a bipolar transistor. The bipolar transistors in the input leg differ from those in the reference leg, so that the difference in base-emitter on voltages increases with temperature. The increasing difference in base-emitter on voltage compensates for the decrease in the absolute value of the base-emitter on voltage with temperature. Voltage level sensing is accomplished by sampling the input voltage with a capacitor, charge-sharing the sampled voltage with one of the precharged charge-sharing capacitors, and coupling the charge-shared result to an input of a differential amplifier comparator. The second charge-sharing capacitor, after sharing its charge with another capacitor inserted for purposes of circuit matching, is coupled to the other input of the differential amplifier, and the comparison is performed.

REFERENCES:
patent: 4024414 (1972-05-01), Gurry
patent: 4845382 (1989-07-01), Eouzan et al.
patent: 4905056 (1990-02-01), Berndt et al.
patent: 5206543 (1993-04-01), Takita et al.
Gray et al., Analysis and Design of Analog Integrated Circuits, Second Edition, (1977, 1984) pp. 289-296.

Affiliated with

Also associated with

Rating

Temperature-compensated voltage level sense circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Temperature-compensated voltage level sense circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Temperature-compensated voltage level sense circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1099893