Reference current acquisition circuit, read-only memory and electronic equipment

Abstract

The invention discloses a reference current obtaining circuit, a read-only memory and an electronic device. The reference current obtaining circuit comprises a current mirror circuit, a switch circuit, a pull-down circuit and a pulse generation circuit, wherein the current mirror circuit is suitable for outputting a reference current according to the reference current, and comprises at least one current input branch and at least one current output branch; the at least one current input branch and the at least one current output branch are connected at a reference node; the reference current is input to the first end of the switch circuit; the second end of the switch circuit is connected with the at least one current input branch; a chip selection signal is input to the control end of the switch circuit; the chip selection signal controls the reference current to flow into the at least one current input branch; the pull-down circuit provides a discharge path to ground for the reference node; and the pulse generation circuit is suitable to control the discharge path to be switched on under the edge triggering of the chip selection signal in a preset power-on time according to the chip selection signal and to control the discharge path to be always kept switched off after the preset power-on time. The problem that the reference current provided for a sensitive amplifier in the read-only memory is instable can be solved.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a reference current acquisition circuit, a read-only memory and electronic equipment. Background technique [0002] The data stored in the read-only memory (Read-Only Memory, ROM) is different from the random access memory (Random Access Memory, RAM), which can be rewritten quickly. It is generally written in advance, as described in its working process Data can only be read. Because the data stored in ROM is stable, the data will not be lost after power failure, and its structure is relatively simple, and it is more convenient to read, so it is often used to store various fixed programs and data. [0003] In ROM design, it is necessary to provide a stable reference current for its internal sense amplifier, and the stability of this reference current will affect the stability and accuracy of readings in ROM. The reference current is generally provided in a reference current...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is the unstable problem of the reference current provided to the sense amplifier in the read-only memory of the prior art

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