Current sensing circuit with high input impedance
US6072339A · kind A · utility
5Cited by
3References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1998 |
| Grant date | Jun 6, 2000 |
| Priority date | — |
| Expiry date | Nov 4, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/0023
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A current sensing circuit with high input impedance comprises a first transconductance amplifier connected across the terminals of a resistor, through which a current to be measured flows. A voltage amplifier is cascade-connected to the first transconductance amplifier. A second transconductance amplifier is feedback connected between an output of the voltage amplifier and a virtual ground node of the voltage amplifier. A ratio between the output voltage of the voltage amplifier and the voltage across the resistor are equal, in absolute value, to a ratio of the transconductances of the first and second transconductance amplifiers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.