Active bit-line clamp circuit for flat cell structure of mask re

Details Active bit-line clamp circuit for flat cell structure of mask re Active bit-line clamp circuit for flat cell structure of mask re

1994-12-27

1995-12-12

Nelms, David C.

Static information storage and retrieval

Read/write circuit

Including signal clamping

36518911, G11C 700

Patent

active

054756375

ABSTRACT:
A mask ROM device having active bit-line clamp circuits which employ a voltage-to-current converter as the clamp circuit for selectively coupling a main bit line of the ROM memory device to a selected one of virtual ground lines. The voltage-to-current converter is selectively coupled between the main bit line and a first or second virtual ground line for clamping therebetween. The voltage-to-current converter converts the voltage difference between the coupled main bit line and the selected first or second virtual ground line into a corresponding current in proportion to a voltage difference, the converted current being coupled to the selected first or second virtual ground line.

REFERENCES:
patent: 4899311 (1990-02-01), Petschauer et al.
patent: 5132936 (1992-07-01), Keswick et al.
patent: 5307307 (1994-04-01), Wada et al.
patent: 5369613 (1994-11-01), Matsui

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