Multiplexing circuit of ldo and por

Abstract

The invention provides a multiplex circuit of an LDO and a POR, and relates to the technical field of electronic circuits. The multiplex circuit of the LDO and the POR comprises an amplifier circuit and a Schmitt trigger, and the amplifier circuit comprises a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor; the first MOS transistor is connected with the second MOS transistor, the second MOS transistor is connected with the third MOS transistor, a fifth MOS transistor and the Schmitt trigger, the third MOS transistor is connected with the fourthMOS transistor, and the fourth MOS transistor is connected with the fifth MOS transistor through a resistor. By means of the multiplex circuit, the power dissipation of an LDO circuit can be furtherlowered, and a common part of the LDO circuit and a POR circuit is integrated to reduce the chip area.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a multiplexing circuit of LDO and POR. Background technique [0002] In the design of large-scale digital-analog mixed-signal integrated circuit chips, because there are a large number of digital units such as control registers and status registers in the chip, when the system is first connected to the power supply, the status of these units is uncertain. These uncertain states may cause chip malfunctions and affect chip reliability and stability. Therefore, there is a need for a circuit that can provide a global reset signal for the chip during the power-on process of the system to ensure that the chip can start from a certain state. This circuit is a power-on reset circuit (Power on Reset, POR for short). . [0003] For some mixed-signal integrated circuits, a low dropout regulator (LDO) is often used to provide a low power supply voltage for the digital part. It...

AI Technical Summary

Problems solved by technology

[0007] If a voltage amplifier is used, a multi-stage amplifier is generally used. Compared with the current amplifier, only a current mirror circuit is used, and the power consumption is lower; if a multiplexing mechanism is not used, each of the LDO and POR modules needs a reference Source, sampling module, comparator, thus requiring more electronic components

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