Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2008-06-10
2008-06-10
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C327S391000, C327S554000
Reexamination Certificate
active
07385439
ABSTRACT:
An analog switch used in a switched capacitor filter has N-channel and P-channel MOS FETs connected in parallel between input and output switch terminals, with capacitor charge currents being periodically produced from the output terminal. The filter derives an output signal with respect to a reference voltage and maintains the switch input and output terminal at the reference voltage, while respective substrate potentials of the N-channel and P-channel MOS FETs are fixed at the reference voltage, so that the analog switch does not produce an external flow of leakage current that can affect the output signal of the filter during each interval when the switch is open.
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Makino Takanori
Nagase Kazuyoshi
Denso Corporation
Le Dinh T.
Posz Law Group , PLC
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