Restore circuit for a semiconductor storage

Details Restore circuit for a semiconductor storage Restore circuit for a semiconductor storage

1980-07-11

1982-06-08

Moffitt, James W.

Static information storage and retrieval

Read/write circuit

Precharge

3072383, G11C 700

Patent

active

043342949

ABSTRACT:
Disclosed is a restore circuit for restoring an integrated semiconductor storage array having storage cells consisting of bipolar transistors. The restore circuit includes a reference voltage generator, an impedance converter, and switches to connect the reference voltage generator and the impedance converter to the storage array. The reference voltage generating circuit includes a current source and at least one reference storage cell identical in construction to the storage cells of the array. The reference voltage generating circuit provides a reference voltage to the impedance converter which supplies a second reference voltage to the array at a greatly reduced impedance. The equivalent circuit of the storage cells is that of a capacitor in parallel with a diode. Thus, the impedance converter provides an initial surge of capacitive current which restores the cells, followed by a standby current which is a function of the diode characteristics of the cell equivalent circuit.

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IEEE Jrnl. Solid State Circuits, vol. SC-13, No. 5, Oct. 78, K. Kawarda et al., pp. 656-663.

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