Device having internal voltage generating circuit
First Claim
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1. An apparatus comprising;
- an amplifying circuit having first and second input terminals and an output terminal;
a ground terminal;
a resistance selecting circuit configured to produce a plurality of internal voltages different from each other and supply a selected one of the plurality of internal voltages to the second input terminal;
a first variable resistance circuit coupled between the output terminal and the resistance selecting circuit, the first variable resistance circuit configured to exhibit a first variable resistance value that comprises a sum of a first variable resistance component and a first constant resistance component; and
a second variable resistance circuit coupled to the ground terminal and the resistance selecting circuit, the second variable resistance circuit configured to exhibit a second variable resistance value that comprises a sum of a second variable resistance component and a second constant resistance component.
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Abstract
A device includes an amplifying circuit having first and second input terminals and an output terminal, a ground terminal, a variable resistance circuit, and a resistance selecting circuit coupled in series to the variable resistance circuit between the output terminal and the ground terminal. The resistance selecting circuit includes a first node coupled to the second input terminal, a plurality of resistors coupled in series to each other and a plurality of gate circuits each coupled between the first node and one end of a corresponding one of the resistors.
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Citations
18 Claims
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1. An apparatus comprising;
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an amplifying circuit having first and second input terminals and an output terminal; a ground terminal; a resistance selecting circuit configured to produce a plurality of internal voltages different from each other and supply a selected one of the plurality of internal voltages to the second input terminal; a first variable resistance circuit coupled between the output terminal and the resistance selecting circuit, the first variable resistance circuit configured to exhibit a first variable resistance value that comprises a sum of a first variable resistance component and a first constant resistance component; and a second variable resistance circuit coupled to the ground terminal and the resistance selecting circuit, the second variable resistance circuit configured to exhibit a second variable resistance value that comprises a sum of a second variable resistance component and a second constant resistance component. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus comprising:
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an amplifying circuit having first and second input terminals and an output terminal; a ground terminal; a resistance selecting circuit configured to produce a plurality of internal voltages different from each other and supply a selected one of the plurality of internal voltages to the second input terminal; a first variable resistance circuit including first and second resistors coupled in series between the output terminal and the resistance selecting circuit; and a second variable resistance circuit including third and fourth resistors coupled in series between the ground terminal and the resistance selecting circuit. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. An apparatus comprising;
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an amplifying circuit configured to be supplied with first and second voltages and to generate a third voltage responsive to a voltage comparison between the first and second voltages; a resistance selecting circuit configured to be supplied with the third voltage and configured to generate a plurality of internal voltages different from each other and generate a fourth voltage lower than any of the plurality of internal voltages based on the third voltage, the resistance selecting circuit further configured to output a selected one of the plurality of internal voltages as the second voltage to the amplifying circuit; and a variable resistance circuit configured to be supplied with the fourth voltage and a ground voltage. - View Dependent Claims (15, 16, 17, 18)
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Specification