Internal voltage generation circuit
AssigneeFujitsu Limited
InventorTomohiro Kawakubo
Life of this patent
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Abstract
An internal voltage generation circuit with a small area, which has many correction points and can provide an output voltage with a high precision, has been disclosed. In this internal voltage generation circuit, some resistors, among the resistors which are connected in series constituting the feedback circuit, have different resistance and transfer gates are provided in parallel to the resistors of different resistance. This configuration has a decode function and, therefore, the decoder can be eliminated and the number of sets of an inverter, a transfer gate, and a resistor can also be reduced, resulting in a reduction in area without a reduction in the number of the correction points.
Claims7
An internal voltage generation circuit comprising a reference potential generation circuit that generates a reference (constant) potential, an amplification circuit having a first and second input terminals that generates an internal voltage according to the reference potential applied to the first input terminal, and a feedback circuit that specifies a voltage ratio between the second input terminal of said amplification circuit and an output terminal of said internal voltage, wherein:
- said feedback circuit has a string of plural resistors connected in series and a switch circuit equipped with a plurality of switches that determine the connection relation of said second input terminal to said string of plural resistors;
- and there exist at least some resistors, among said plural resistors, have different resistances.
An internal voltage generation circuit comprising a reference potential generation circuit that generates a reference potential and has two conversion states, that is, the middle level equivalent to said reference potential and the ground level, a switch circuit that temporarily connects the output of said reference potential generation circuit to a power source voltage level, an amplification circuit that generates an internal voltage according to the reference potential output of said reference potential generation circuit, and a feedback circuit that specifies the voltage ratio between the operation reference terminal of said amplification circuit and the output terminal of said internal voltage, wherein, a reference potential level detection circuit, which detects the output of said reference potential generation circuit and generates a signal that brings said switch circuit into conduction when said output is less than a predetermined value and brings said switch circuit out of conduction when said output is more than a predetermined value, is provided.
Dependencies are inferred from the claim text.