Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1996-01-03
1999-02-16
Cunningham, Terry D.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327534, 327312, 327313, G05F 110
Patent
active
058724796
ABSTRACT:
An apparatus for regulating a substrate voltage in a semiconductor device having a substrate voltage regulator for controlling generation of a substrate voltage so as to supply a pre-set substrate voltage to a substrate, including: a stack of a plurality of resistors being connected in series with each other and a plurality of switches being connected in parallel to corresponding resistors other than a resistor connected to a power supply voltage for decreasing an external voltage applied to one end thereof to a predetermined level; a first transistor having a first electrode connected to another end of the stack of the plurality of the resistors, a gate connected to ground and a second electrode connected to the substrate, for being controlled by a substrate voltage of the substrate; and a second transistor having a gate to which the inverse of a signal outputted from a connecting point between the other end of the stack of the plurality of the resistors and the first transistor is applied, and first and second electrodes selectively connected to the resistors other than the first resistor connected to the power supply voltage, for adjusting a resistance value of the stack of the plurality of the resistors accordingly as the first and second electrodes of the first transistor are selectively connected to the resistors other than the first resistor connected to the power supply voltage, by which a substrate voltage is maintained constant regardless of an unstable variation of a power supply voltage applied from an external source so as to prevent a threshold voltage variation and an operation point variation of the device, thereby obtaining an accurate circuit operation.
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Cunningham Terry D.
LG Semicon Co. Ltd.
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