Voltage generator and flash memory thereof
AssigneeWinbond Electronics Corp.
InventorShih-Ming Tsai
Life of this patent
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Abstract
A voltage generator and a flash memory thereof are provided. The voltage generator is used to provide a work reference voltage having a plurality of reference levels to a word line decoder circuit and includes a plurality of voltage trimming circuits. The voltage trimming circuits are connected in series between the work reference voltage and a ground voltage and respectively receive a trimming code, wherein the voltage levels of the work reference voltages are controlled by the trimming codes received by the voltage trimming circuits to select one of the reference levels.
Claims10
A voltage generator adapted to provide a work reference voltage having a plurality of reference levels to a word line decoder circuit, the voltage generator comprising:
- a plurality of voltage trimming circuits connected in series between the work reference voltage and a ground voltage and respectively receiving a trimming code, wherein a voltage level of the work reference voltage is controlled by the trimming codes received by the voltage trimming circuits to select one of the reference levels;
- a charge pump receiving a gain voltage to provide the work reference voltage;
- an impedance circuit coupled in series between the work reference voltage and the voltage trimming circuits;
- a voltage divider coupled in series between the voltage trimming circuits and the ground voltage to provide a feedback voltage different from the work reference voltage;
- and
- a differential amplifier receiving the feedback voltage different from the work reference voltage and an operation reference voltage to provide the gain voltage.
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Dependencies are inferred from the claim text.