High input impedance, strobed CMOS differential sense amplifier

Details High input impedance, strobed CMOS differential sense amplifier High input impedance, strobed CMOS differential sense amplifier

1999-02-01

2000-08-22

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 52, 327 54, 327 55, 327 57, G01R 1900

Patent

active

061078395

ABSTRACT:
The sense amplifier of the present invention senses the logic level of a digital data element that is conveyed using a low voltage swing signal. That sensing operation occurs relatively soon after the logic level of the data element begins to be established at the input of the sense amplifier. Such a sense amplifier is referred to as having increased sensitivity due to an improved common mode rejection ratio. The common mode rejection ratio is improved by turning-on a pair of evaluate transistors in a successive manner. The sense amplifier includes a pair of discharge paths for allowing a charge, stored on associated internal signals, to be discharged at a given rate that is proportional to voltage levels of the associated data signals. Those data signals are isolated from the discharge paths such that the associated logic levels are not affected by the above mentioned discharge operation. An evaluate unit is connected to the discharge paths and conveys a first portion of the above mentioned charge to electrical ground at an initial rate. At a later time, the evaluate unit conveys a second portion of charge to electrical ground at a subsequent rate, such that the sensitivity of the sense amplifier is improved.

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