Method and apparatus for regulating the output voltage of negative charge pumps
First Claim
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1. A regulation circuit, comprising:
- a source of a reference voltage,a charge pump circuit,a first voltage divider circuit connected between an output of the charge pump and the source of reference voltage for furnishing a first voltage,a second voltage divider connected between the source of reference voltage and a known voltage level for furnishing a second voltage,a comparator for comparing the output of the charge pump circuit with the reference voltage, andan oscillator for operating the charge pump when the first voltage is less than the second voltage and for interrupting operation of the charge pump when the first voltage is greater than the second voltage.
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Abstract
A regulation circuit which includes circuitry for furnishing a reference voltage, a voltage divider for furnishing a voltage provided by a charge pump circuit, a comparator for comparing the output of the charge pump circuit with the reference voltage, and apparatus for operating the charge pump when the voltage drops below the reference level and for interrupting operation of the charge pump when the voltage produced by the charge pump becomes greater than the reference voltage.
132 Citations
10 Claims
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1. A regulation circuit, comprising:
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a source of a reference voltage, a charge pump circuit, a first voltage divider circuit connected between an output of the charge pump and the source of reference voltage for furnishing a first voltage, a second voltage divider connected between the source of reference voltage and a known voltage level for furnishing a second voltage, a comparator for comparing the output of the charge pump circuit with the reference voltage, and an oscillator for operating the charge pump when the first voltage is less than the second voltage and for interrupting operation of the charge pump when the first voltage is greater than the second voltage. - View Dependent Claims (2, 3, 4, 5)
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6. A computer system, comprising:
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a central processor; a system bus coupled to the processor; a main memory coupled to the system bus; and a programmable non-volatile long term memory coupled to the system bus, further comprising a flash EEPROM memory array, and a circuit for furnishing voltages for operating the flash EEPROM memory array that further comprises a source of a reference voltage, a charge pump, a first voltage divider circuit connected between an output of the charge pump and the source of reference voltage for furnishing a first voltage, a second voltage divider connected between the source of reference voltage and a known voltage level for furnishing a second voltage, a comparator for comparing the output of the charge pump circuit with the reference voltage, and an oscillator for operating the charge pump when the first voltage is less than the second voltage and for interrupting operation of the charge pump when the first voltage is greater than the second voltage. - View Dependent Claims (7, 8, 9, 10)
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Specification