Reference current generating circuit
First Claim
1. A reference current generating circuit comprising:
- a first standard current generating circuit to generate a first standard current;
a second standard current generating circuit to generate a second standard current by operating for a part of an operation period of the first standard current generating circuit;
a first trimming circuit to generate a first reference current by trimming the value of the first standard current;
a second trimming circuit to generate a second reference current by trimming the value of the second standard current;
a comparison circuit to compare a value of the first reference current with a value of the second reference current; and
a trimming controller to control the trimming of the first trimming circuit so that the value of the first reference current approaches the value of the second reference current.
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Accused Products
Abstract
A reference current generating circuit includes first and second standard current generating circuits to generate first and second standard currents, respectively and first and second trimming circuits to generate first and second reference circuits by trimming the standard current values outputted from the standard current generating circuits. The second standard current generating circuit operates for a part of an operation period of the first standard current generating circuit. The value of the first reference current is compared with a value of the second reference current, and controlled so as to approach the value of the second reference current by a trimming controller.
58 Citations
19 Claims
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1. A reference current generating circuit comprising:
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a first standard current generating circuit to generate a first standard current; a second standard current generating circuit to generate a second standard current by operating for a part of an operation period of the first standard current generating circuit; a first trimming circuit to generate a first reference current by trimming the value of the first standard current; a second trimming circuit to generate a second reference current by trimming the value of the second standard current; a comparison circuit to compare a value of the first reference current with a value of the second reference current; and a trimming controller to control the trimming of the first trimming circuit so that the value of the first reference current approaches the value of the second reference current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A reference current generating circuit comprising:
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a first standard current generating circuit to generate a first standard current; a second standard current generating circuit to generate a second standard current by operating for a part of an operation period of the first standard current generating circuit; a first trimming circuit to generate a first reference current by trimming the value of the first standard current; a second trimming circuit to generate a second reference current by trimming the value of the second standard current; a comparison circuit to compare the value of the first reference current with the value of the second reference current; a trimming controller to control the trimming of the first trimming circuit so that the value of the first reference current approaches the value of the second reference current; a sense circuit to compare the first reference current with a cell current read from a memory cell; an error correction circuit to correct error data read from the memory cell; an error frequency determiner to determine the error frequency based on the corrected result by the error correction circuit; and a power supply controller to control power supply to the second standard current generating circuit based on the decision by the error frequency determiner. - View Dependent Claims (16, 17, 18, 19)
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Specification