Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2007-11-01
2009-08-04
Nguyen, Vincent Q (Department: 2831)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S679000, C324S686000, C073S504020, C073S514160, C073S862625, C702S104000
Reexamination Certificate
active
07570066
ABSTRACT:
An apparatus includes a first capacitive sensor connected to a first supply voltage, a second capacitive sensor connected to a second supply voltage, a sensing circuit for producing a sense voltage in response to current flowing in the first and second capacitive sensors, a first mixer for combining the sense voltage with a first reference voltage to produce a first signal representative of in-plane displacement between electrodes of the first and second capacitive sensors, and a second mixer for combining the sense voltage with a second reference voltage to produce a second signal representative of out-of-plane displacement between the electrodes of the first and second capacitive sensors.
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“What is a Lock-in Amplifier?”, Technical Note, TN 1000, 4 pgs. copyright Perkin Elmer, 2000.
Baldridge Benjamin M
Lenart, Esq. Robert P.
Nguyen Vincent Q
Pietragallo Gordon Alfano Bosick & Raspanti, LLP
Seagate Technology LLC
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