Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2007-01-16
2007-01-16
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
11051425
ABSTRACT:
A differential termination and attenuator network having an internal 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 internal termination voltage. A control circuit generates scaled termination and compensation voltages and associated drive currents using the internal 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 and null the DC currents at the input of the network. The internal termination voltage generator receives termination voltage parameters from a measurement instrument for generating the internal termination voltage.
REFERENCES:
patent: 4393347 (1983-07-01), Looper
patent: 4833418 (1989-05-01), Quintus et al.
patent: 6629048 (2003-09-01), Law et al.
patent: 2004/0085085 (2004-05-01), Muhtaroglu et al.
Daniels Dale R.
Pollock Ira G.
Stevens Michael D.
Van Epps Richard A.
Barlow John
Bucher William K.
Sievers Lisa
Tektronix Inc.
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