Temperature compensated sense amplifier for PROMs and the like

Details Temperature compensated sense amplifier for PROMs and the like Temperature compensated sense amplifier for PROMs and the like

1978-08-03

1980-07-29

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307237, 307310, 307DIG3, H03K 5153

Patent

active

042152828

ABSTRACT:
A sense amplifier and sensing scheme for sensing the normal or blown condition of fuses in a programmable read only memory (PROM) or similar device. A sensing circuit is provided with a threshold level separating high and low input levels indicative of the fuse condition. The sensing circuit has one circuit branch with a first current mirror with a temperature characteristic which provides a threshold level which is slightly divergent with reference to a low level input. Another circuit branch clamps the high input level to the slightly divergent threshold level and uses a second current mirror with a temperature characteristic which provides a high level slightly more divergent than the threshold level. By selecting mirror currents proportionally, high level and threshold level temperature characteristic divergence can be proportionally controlled in selected amounts with respect to the low level. Current sources for the sense amplifier are made to offset voltage fluctuations, making the sense amplifier highly insensitive to voltage fluctuations in addition to temperature variations.

REFERENCES:
patent: 3668429 (1972-06-01), Ainsworth
patent: 3716722 (1973-02-01), Bryant et al.
patent: 3872450 (1975-03-01), Reynolds
patent: 4042950 (1977-08-01), Price

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