Differential termination and attenuator network for a measurement probe having an automated common mode termination voltage generator
US7162375B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2005 |
| Grant date | Jan 9, 2007 |
| Priority date | — |
| Expiry date | Apr 28, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R1/06766
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A differential termination and attenuator network having an automated common mode termination voltage generator includes first and second termination resistors coupled in parallel with corresponding resistive attenuator circuits. A monitoring circuit coupled to input nodes of the network generates an output signal representative of the combination of a DC common mode voltage on the input nodes and an adjustable termination voltage. A control circuit generates scaled termination and compensation voltages and associated drive currents using the adjustable termination voltage and the monitoring circuit output signal. The scaled termination voltage and the scaled compensation voltage operate on the differential termination and attenuation network to optimize the dynamic range of a differential amplifier connected to the first and second attenuator outputs. An automated termination voltage generator automatically adjusts the adjustable termination voltage to match the DC common mode input voltage, which nulls the DC currents at the input nodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.