Apparatus for measuring differential impedances

Details Apparatus for measuring differential impedances Apparatus for measuring differential impedances

1990-08-15

1991-11-26

Harvey, Jack B.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324705, G01R 2708

Patent

active

050686186

ABSTRACT:
An apparatus for measuring differential impedances which incorporates a CMOS timer in place of the sine wave generator in a typical AC bridge configuration. A toroidal signal transformer having its primary and secondary windings tightly twisted together and wound around the core lessens temperature drift characteristics. The differential bipolar current signal provided by the secondary winding is passed through an AC to DC converter which is switched by a field effect transistor, thereby eliminating the need for prior art inverter comparator circuits. Finally, by use of a bandpass filter after the signal transformer and by insertion of a capacitor before the AC to DC converter, the need for the active filter stage used in the prior art is eliminated.

REFERENCES:
patent: 4837501 (1989-06-01), Fry et al.
Pogson; "Circuit & Design Ideas;" Electronics Australia, vol. 42, No. 3; Jun. 1980, p. 72.
IC Master 12-1980; United Technical Publications; pp. 402-403.

Affiliated with

Also associated with

Rating

Apparatus for measuring differential impedances does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for measuring differential impedances, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for measuring differential impedances will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2388180