Static information storage and retrieval – Read/write circuit – Including signal clamping
Patent
1996-01-25
1997-03-18
Nelms, David C.
Static information storage and retrieval
Read/write circuit
Including signal clamping
365 94, 365104, G11C 1134
Patent
active
056129157
ABSTRACT:
A clamp circuit for a read-only-memory (ROM) device provides clamp voltages which can uniformly compensate for the parasitic capacitance on ROM word lines and improve the performance of the ROM device. The clamp circuit includes an active load, a plurality of amplifiers and a transmission gate. The amplifiers have various trip voltages and are controlled by different decoding signals for providing various clamp voltages to different word lines in the ROM device. Each amplifier is composed of a NOR gate and a transistor. The amplifier trip voltages can be easily set to desired values when designing NOR gate layout patterns without additional complicated processes being introduced into the fabrication methodology of a semiconductor integrated circuit.
Chen Hsin-Li
Fu Stephen
Nelms David C.
Niranjan F.
United Microelectronics Corporation
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