Linear self-excited capacitance bridge

Details Linear self-excited capacitance bridge Linear self-excited capacitance bridge

1982-09-29

1984-05-01

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 57R, 324 60R, 324DIG1, G01R 2726, G01R 2700

Patent

active

044464231

ABSTRACT:
A versatile linear self-excited bridge primarily intended for the measurement or comparison of very low capacitance values. The differential input of the device makes it suitable in a variety of other applications such as, tachometers, gap or position indicators, null detectors, transducers, etc. The inputs of a pair matched bipolar transistors which exhibit negative resistance characteristics are connected to a common inductor which completes an oscillatory loop. The ratio of the DC potentials at the collectors of the two transistors are directly related in their respective emitter capacitors, and hence when, these capacitors are equal in value, the output of a differential amplifier having inputs which are connected to the collectors of the two transistors is zero.

REFERENCES:
patent: 4038609 (1977-07-01), Langberg
patent: 4295091 (1981-10-01), Ponkala

Affiliated with

Also associated with

Rating

Linear self-excited capacitance bridge does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Linear self-excited capacitance bridge, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linear self-excited capacitance bridge will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2034441