Modified bridge circuit for measurement purposes
US4528499A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1982 |
| Grant date | Jul 9, 1985 |
| Priority date | — |
| Expiry date | Oct 7, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R17/105
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a four element modified bridge circuit for measurement purposes at least one impedance element is variable according to a magnitude to be measured. Via a first operational amplifier a DC supply voltage is connected across two bridge nodes facing each other, and at the other two nodes facing each other an output signal is delivered corresponding to the magnitude to be measured. By means of a second operational amplifier one of the output nodes is virtually drawn to ground so that the signal at the second output bridge node is referenced to ground. Thus, the signal at the second output node corresponds to the desired measured magnitude without a superimposed power supply voltage and may be amplified by a third standard operational amplifier without the need of a differential amplifier circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.