Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2007-07-24
2010-02-23
Dole, Timothy J (Department: 2831)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S678000, C324S679000
Reexamination Certificate
active
07667468
ABSTRACT:
A capacitive sensor with ratiometric voltage references includes a voltage source, a charge transfer switch, an integrating capacitor, and a comparator. The voltage source is configured to generate a first voltage reference and a second voltage reference in response to a supply voltage, where the first voltage reference changes proportionally to the second voltage reference in response to a change in the supply voltage. The charge transfer switch is coupled to the integrating capacitor to distribute charge between a sensing capacitor and the integrating capacitor, where the charge is accumulated in response to the first voltage reference. The comparator is coupled to the second voltage reference and the integrating capacitor to compare a voltage on the integrating capacitor against the second voltage reference.
REFERENCES:
patent: 4716361 (1987-12-01), Sheffer
patent: 5461321 (1995-10-01), Sanders et al.
patent: 6362632 (2002-03-01), Livingston
patent: 7145350 (2006-12-01), Mellert et al.
patent: 7235983 (2007-06-01), O'Dowd et al.
patent: 7304483 (2007-12-01), O'Dowd et al.
Cypress Semiconductor Corporation
Dole Timothy J
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