VOLTAGE BOOSTER AND MEMORY STRUCTURE USING THE SAME
First Claim
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1. A voltage booster, comprising:
- at least one first stage voltage pump, comprising a first pump circuit, wherein the first pump circuit transfers electronic charges from a supply voltage to a first node voltage;
at least one second stage voltage pump, coupled to the first stage voltage pump, the second stage voltage pump comprising a second pump circuit, a third pump circuit, and an enabling circuit, wherein the enabling circuit controls on or off states of the third pump circuit according to an active signal, and the second pump circuit transfers electronic charges from the first node voltage to a second node voltage; and
a switch, coupled to the second stage voltage pump;
wherein when the third pump circuit is in normal operation, the third pump circuit transfers electronic charges from the second node voltage to an output voltage, and when the third pump circuit is turned off, the switch conducts the second node voltage as the output voltage, and the current of the output voltage is provided by the second pump circuit.
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Abstract
A voltage booster and a memory structure using the same are provided. When a data storage unit in the memory structure is in normal operation, all voltage pumps in the voltage booster are turned on for boosting a supply voltage. However, when the data storage unit is in standby state, in the voltage booster, some voltage pumps are turned on while other voltage pumps are turned off, for boosting the supply voltage. Accordingly, the standby current and power consumption are reduced and the pump efficiency is improved.
5 Citations
13 Claims
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1. A voltage booster, comprising:
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at least one first stage voltage pump, comprising a first pump circuit, wherein the first pump circuit transfers electronic charges from a supply voltage to a first node voltage; at least one second stage voltage pump, coupled to the first stage voltage pump, the second stage voltage pump comprising a second pump circuit, a third pump circuit, and an enabling circuit, wherein the enabling circuit controls on or off states of the third pump circuit according to an active signal, and the second pump circuit transfers electronic charges from the first node voltage to a second node voltage; and a switch, coupled to the second stage voltage pump; wherein when the third pump circuit is in normal operation, the third pump circuit transfers electronic charges from the second node voltage to an output voltage, and when the third pump circuit is turned off, the switch conducts the second node voltage as the output voltage, and the current of the output voltage is provided by the second pump circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A memory structure, comprising:
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a first voltage booster, generating a first reference voltage, the first voltage booster comprising a plurality of voltage pumps; a second voltage booster, generating a second reference voltage; a control circuit, generating an enabling signal according to an address signal and an active signal; a word line driving circuit, boosting the voltage level of the enabling signal to the first reference voltage or the second reference voltage according to the logic state of the enabling signal; and a data storage unit, being operated according to the enabling signal boosted by the word line driving circuit; wherein when the data storage unit is in standby state, a portion of the voltage pumps are turned off in order to reduce a standby current of the memory structure. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification