Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Reexamination Certificate
2006-05-25
2010-02-09
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
C333S08100R
Reexamination Certificate
active
07659765
ABSTRACT:
Operations as a variable resistor are favorably realized even when a drain-source voltage of a variable MOS resistor and that of a reference MOS resistor are not the same. A gate voltage of the variable MOS resistor is controlled with reference to a gate voltage which is controlled such that a voltage generated in the reference MOS resistor is controlled to be the same as a reference voltage. A resistor is connected in parallel with the reference MOS resistor between the drain and source thereof, the resistor including a pair of resistors having the same resistance connected in series. Half of a drain-source voltage of the reference MOS resistor is detected at an intermediate point of the pair of resistors. The gate voltage of the variable resistor is obtained by subtracting one-half of the drain-source voltage from the gate voltage of the reference MOS resistor.
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International Search Report dated Aug. 7, 2006.
K&L Gates LLP
Sony Corporation
Wells Kenneth B.
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