Static information storage and retrieval – Floating gate – Particular biasing
Reexamination Certificate
2008-01-29
2008-01-29
Auduong, Gene N. (Department: 2827)
Static information storage and retrieval
Floating gate
Particular biasing
C365S189090, C365S226000
Reexamination Certificate
active
07324380
ABSTRACT:
A voltage reference circuit provides a reference voltage that can be precisely programmed. The threshold voltage of a first non-volatile memory (NVM) transistor is programmed while coupled in parallel with a second NVM transistor. During programming, one or more capacitors are connected between the floating gate of the first NVM transistor and ground, and one or more capacitors are connected between the floating gate of the second NVM transistor and ground. The first and second NVM transistors are then coupled to a differential amplifier, which is used to generate a single-ended reference voltage in response to the programmed threshold voltage of the first NVM transistor. Bipolar transistors are selectively switched between the various capacitors and ground, thereby providing precise adjustment of the temperature coefficient of the voltage reference circuit.
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Eftimie Sabin A.
Georgescu Sorin S.
Negut Alina I.
Auduong Gene N.
Bever Hoffman & Harms LLP
Catalyst Semiconductor, Inc.
Hoffman, Esq. E. Eric
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