Differential termination and attenuator network for a...

Details Differential termination and attenuator network for a... Differential termination and attenuator network for a...

2007-01-09

2007-01-09

Barlow, John (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C702S064000, C702S117000, C324S126000, C327S308000, C333S08100R

Reexamination Certificate

active

11051653

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.

REFERENCES:
patent: 4393347 (1983-07-01), Looper
patent: 4833418 (1989-05-01), Quintus et al.
patent: 6590436 (2003-07-01), Jordanger et al.
patent: 6629048 (2003-09-01), Law et al.

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