Current-mode sensitive amplifier

A technology of sense amplifier and current mode, used in instruments, static memory, digital memory information, etc., can solve the problems of reducing the read margin, reducing the memory read margin, sampling error, etc., and reducing the current sampling deviation. , the effect of improving the read margin

Active Publication Date: 2012-04-18
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

Due to the sampling error introduced by the current mode sense amplifier circuit design itself, the read margin is reduced, which reduces the read margin of the memory

Method used

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Embodiment Construction

[0027] The sense amplifier is one of the key circuits when the memory composed of multiple storage units reads the stored information. Its function is to read the storage unit and compare it with the reference storage unit, and output the comparison result (logic "0" or logic "1"). According to the working principle, the sense amplifier is divided into voltage mode and current mode. Conventional current-mode sense amplifiers for reading information from array memory cells, see figure 1 , including a feedback clamping circuit 10 and a current comparison circuit 20, wherein the output (IO) end of the feedback clamping circuit 10 provides a clamping voltage for the read memory cell 30, and generates a read current I MC ; The same direction input terminal of current comparator circuit 20 is used for collecting and reading current I MC , the non-inverting input end of the current comparator circuit 20 is connected with the input end of the feedback clamping circuit 10, and the in...

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Abstract

The invention provides a current-mode sensitive amplifier which is used for arraying information reading of a memory cell of a memory and comprises a feedback clamping circuit, a load balance circuit and a current comparing circuit, wherein a clamp voltage output end of the feedback clamping circuit supplies a clamp voltage to a read memory cell through the load balance circuit; the load balance circuit is used for balancing output voltages when the feedback clamping circuit is connected with different loads; the current comparing circuit comprises a same-phase input end, an opposite phase input end and an output end, wherein the same-phase input end is connected with a sampling current output end of the feedback clamping circuit, the opposite phase input end is connected with a reference memory cell, and the output end is used for outputting a comparing result of the current comparing circuit. By adding the load balance circuit, the modulation of different loads on the clamp voltage of the output end of the feedback clamping circuit can be reduced, the current deviation of the sampling memory cell can be decreased, and the reading margin of the memory can be improved.

Description

technical field [0001] The invention relates to the field of memory information reading, in particular to a current mode sensitive amplifier for reading memory array unit information. Background technique [0002] The sense amplifier is one of the key circuits when the memory composed of multiple storage units reads the stored information. Its function is to sample the storage unit and compare it with the reference storage unit, and output the comparison result (logic "0" or logic "1"). According to the working principle, the sensitive amplifier is divided into voltage mode and current mode, and their sampling input signals are the voltage and current of the storage unit respectively. [0003] Generally, the read margin (Read Margin) is used to characterize the ability to distinguish "0" and "1" when reading memory information. For a current-mode sense amplifier, under a given bias condition, store "0" and "1" The saturation currents of the memory cells of the two kinds of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11C7/06
Inventor 杨诗洋陈岚陈巍巍龙爽
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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