Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1990-03-29
1992-06-09
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324638, 324648, G01R 2702
Patent
active
051210673
ABSTRACT:
A floating sampler and directional bridge for use in characterizing the impedance of an integrated device under test from D.C. up to frequencies above 100 GHz. The directional bridge has the structure of a Wheatstone bridge with resistor values selected such that when the input impedance of the device under test matches the output impedance of the source, no voltage develops across two nodes of the bridge. When no impedance match exists, a floating diode/capacitor sampler comprised of two diode/capacitor pairs driven by local oscillator strobe pulses samples the voltage difference between the two nodes of the bridge and outputs an IF signal proportional to the difference. Another pair of diode/capacitor samplers outputs an IF signal proportional to the amplitude of the RF excitation waveform.
REFERENCES:
patent: 3268807 (1966-08-01), Shively
patent: 4758776 (1988-07-01), Griffin
patent: 4896096 (1990-01-01), Ewart
patent: 4962359 (1990-10-01), Dunsmore
Soviet Inventions Illustrated, section E1: Electrical, week 8803, Mar. 2, 1988, Derwent Publications Ltd., London S01.
Board of Regents of Leland Stanford University
Brown Glenn W.
Wieder Kenneth A.
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