Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1996-03-22
1998-09-08
Oda, Christine K.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324610, G01R 2708
Patent
active
058049789
ABSTRACT:
The circuit for feeding a Wheatstone Bridge (DMS 1 . . . DMS 4) with a rectangular waveform alternating voltage which is derived from a single DC reference voltage, consists of a first operational amplifier (V 1) whose positive input is connected to the DC reference voltage and whose negative input is connected via the switches (S 5 and S 6) alternately to the one (A) or to the other (B) feed point of the bridge, and a second operational amplifier (V 2) whose positive input is connected to ground potential and whose negative input is connected to one measuring input (C) of the bridge. The outputs of the two operational amplifiers (V 1 and V 2) are connected via the switches (S 1 . . . S 4) alternately to the one (A) and to the other (B) feed point of the bridge, and the output signal is taken off at the second measuring output (D) of the bridge. This circuit gives a very stable rectangular waveform alternating voltage with steep switching flanks without roof slope and uses only monolithically integratable components.
REFERENCES:
patent: 3873917 (1975-03-01), Kreuzer
patent: 4596950 (1986-06-01), Lienhard
Gruetzediek Hartmut
Scheerer Joachim
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