Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-01-18
2005-01-18
Cunningham, Terry D. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S539000, C327S543000, C323S315000, C323S316000
Reexamination Certificate
active
06844772
ABSTRACT:
A threshold voltage extraction circuit. The circuit includes a first current mirror having a first transistor and a second transistor. A holding circuit has an output adapted to control a current though the first current mirror by operating to maintain substantially equal the voltages at a first input thereof and at a second input thereof. A third, MOS transistor having a source and a gate, and a resistor circuit, together adapted to generate a voltage which is a multiple of a source-gate threshold voltage of the third transistor, are coupled to the second transistor and to the first input of the holding circuit. A fourth, MOS transistor coupled to the first transistor and to the second input of the subtracting circuit through a second resistor circuit is adapted to generate a threshold voltage across the second resistor circuit, by the operation of the holding circuit. A second current mirror coupled to the first current mirror is adapted to cause a current to flow through a third resistor circuit that corresponds to the current through the first current mirror to thereby provide an output voltage corresponding to the threshold voltage.
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Chen Jun
Hoon Siew Kuok
Brady III Wade James
Cunningham Terry D.
Mosby April M.
Texas Instruments Incorporated
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