Improvemetns in a detection circuit with a level shifting circui

Details Improvemetns in a detection circuit with a level shifting circui Improvemetns in a detection circuit with a level shifting circui

1995-06-07

1997-01-14

Nelms, David C.

Static information storage and retrieval

Read/write circuit

Differential sensing

327 52, 327 56, G11C 700

Patent

active

055946968

ABSTRACT:
A circuit which differentially amplifies voltages that are close to ground with differences of about 0.15 volts uses voltage level shifters, a cross coupled current source and inverters to provide increased speed, accuracy, and gain. Symmetric cross coupled current sources are used in a differential amplifier to provide the differential amplifier with a balanced load. A symmetric and balanced layout senses smaller voltage differences and operates faster than would otherwise be possible. The gain of the cross coupled current source is controlled by four FETs. Voltage level shifters at the input to the differential amplifier allow the differential amplifier to sense signals that are close to ground with a voltage difference of about 0.15 volts. The voltage level shifters also shift the signals to a voltage that increases the gain of the differential amplifier. Two inverters block half level signals from being outputted until the sense amplifier data has been latched. By blocking half level outputs of the differential amplifier, a race condition is eliminated and output enable signal, OE, which may then switch sooner than would otherwise be possible.

REFERENCES:
patent: 5126974 (1992-06-01), Sasaki
patent: 5138579 (1992-08-01), Tatsumi
patent: 5155397 (1992-10-01), Fassino
patent: 5229967 (1993-07-01), Nogle
patent: 5452254 (1995-09-01), Takahashi

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