Current comparison circuit, memory and current comparison method

Abstract

The invention relates to a current comparison circuit, a memory and a current comparison method. The current comparison circuit comprises a first charging and discharging circuit, a first comparator, a second charging and discharging circuit, a second comparator and an edge detecting circuit, wherein the first charging and discharging circuit is suitable for charging a first charging and discharging node under the control of a control signal, or discharging the first charging and discharging node, and the current during the discharging is first current; the first input end of the first comparator receives reference voltage; the second input end of the first comparator is coupled with the first charging and discharging node, and outputs a first comparison result; the second charging and discharging circuit is suitable for charging a second charging and discharging node under the control of the control signal, or discharging the second charging and discharging node, and the current during the discharging is second current; the first input end of the second comparator receives reference voltage; the second input end of the second comparator is coupled with the second charging and discharging node, and outputs a second comparison result; the edge detection circuit is suitable for detecting the turning edges of the first comparison result and the second comparison, and a first and second current comparison result is obtained according to the time difference of the first comparison result and the second comparison result. The scheme has the advantage that the influence of the current comparison circuit on tested current can be avoided.

Description

technical field [0001] The invention relates to current comparison technology, in particular to a current comparison circuit, a memory and a current comparison method. Background technique [0002] Current comparison technology is a very widely used circuit technology in electronic circuits. Generally speaking, there are few devices used for direct current comparison. Generally, the two currents to be compared are converted into voltages in the circuit and then compared. In specific implementation, for small currents, a resistor can be used to sample and convert the current, and for large currents, a transformer, Hall element, etc. can be used for sampling and conversion. figure 1 with figure 2 They are two relatively common current comparator circuits in the prior art. [0003] refer to figure 1 , figure 1 The current comparator circuit 100 shown adopts the method of converting the current into a voltage and then comparing it, including sampling resistors R1 and R2 an...

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Problems solved by technology

[0007] Therefore, when the current comparison circuit of the prior art performs current comparison on the measured current, there is inevitably a voltage drop between the power supply voltage and the current port, which makes the current comparison circuit have an influence on the magnitude of the measured current, while Affects the accuracy of current comparison; in addition, in the memory, the influence of the current comparison circuit on the magnitude of the measured current reduces the read operation accuracy of the memory

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