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US 6,285,245 B1Granted
Constant voltage generating circuit
AssigneeTexas Instruments Incorporated
InventorHiroshi Watanabe
Life of this patent
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AssigneeTexas Instruments Incorporated
InventorHiroshi Watanabe
Estimating the term…
A constant voltage generating circuit, with a negative temperature coefficient, is able to generate a stable voltage despite variations in the power supply voltage. The constant voltage generating circuit comprises a reference current source circuit 10B, a diode DX, an amplifier circuit AMP that amplifies the voltage across diode DX and outputs voltage VCS, and current control circuit 20 that controls the current flowing into node N1. Current control circuit 20 comprises transistors QB1 and QB2, which form a current-mirror constant-current source, and a diode QB3 which has the same characteristics as said diode DX. The current control circuit sinks current from node N1 to transistor QB1 and maintains the temperature coefficient of voltage VCS at a negative value. Reference current source circuit 10B is not affected by the change in the power supply voltage VCC and is able to supply a constant current to node N1.
A constant voltage generating circuit comprising a voltage generating circuit made up of a first bipolar transistor connected as a first diode and an amplifier circuit that amplifies the voltage across the first diode to output a prescribed voltage;
A constant voltage generating circuit comprising:
Dependencies are inferred from the claim text.