Compensated oscillator circuit for charge pumps
AssigneeAdvanced Micro Devices, Inc.
InventorXin Guo
Life of this patent
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Abstract
A charge pump oscillator circuit with compensation for variations in process and operating environment. The charge pump oscillator is designed with a rolloff characteristic that enables operation at both weak and strong process corners without excessive power consumption. Composite resistors in the oscillator circuit are composed of component resistors that are fabricated with different processes, e.g., implant and deposition. The resistance of the composite resistor is thus in order to provide compensation for variations in processing and operating environment. The composite resistor may be used as a feedback loop resistor, or may be used as a source degenerate resistor to control the supply current to the oscillator.
Claims20
A charge pump circuit for a non-volatile memory integrated circuit comprising an oscillator circuit, wherein said oscillator circuit comprises a composite resistor to provide compensation for fabrication process variations and variations in an operational environment.
A flash memory device comprising:
- an array of capacitors coupled by switches;
- an oscillator circuit coupled to said array of capacitors, said oscillator circuit comprising a first resistor having a positive temperature coefficient of resistance, and a second resistor having a negative temperature coefficient of resistance.
Dependencies are inferred from the claim text.