High-voltage cascade current mirror circuit

Abstract

The invention provides a current mirror circuit. The high-voltage cascade current mirror circuit comprises a current source, three low-voltage transistors and two high-voltage transistors. The first connecting end of the current source is connected with a first power end, and the second connecting end of the current source is connected with the first connecting ends of the third low-voltage transistor. The control end of the third low-voltage transistor is connected with the first connecting end of the third low-voltage transistor, and the second connecting end of the third low-voltage transistor is connected with a drain electrode of the first high-voltage transistor and a grid electrode of the first low-voltage transistor. A source electrode of the first high-voltage transistor is connected with a drain electrode of the first low-voltage transistor, and a grid electrode of the first high-voltage transistor is connected with a grid electrode of the second high-voltage transistor and the second connecting end of the current source. A source electrode of the first low-voltage transistor is connected with the second power end, and a grid electrode of the first low-voltage transistor is connected with a grid electrode of the second low-voltage transistor. A source electrode of the second low-voltage transistor is connected with the second power end, and a drain electrode of the second low-voltage transistor is connected with a source electrode of the second high-voltage transistor. Therefore, the lowest working power supply voltage can be reduced, meanwhile high voltage can be also borne, and the high-voltage cascade current mirror circuit further has low power consumption and a small chip area.

Description

【Technical field】 [0001] The invention relates to the field of current mirror circuits, in particular to a high-voltage cascaded current mirror circuit. 【Background technique】 [0002] In some high-voltage circuits, it is necessary to withstand higher voltage, so it is necessary to cascade high-voltage tubes on low-voltage tubes to withstand high voltage. However, due to the poor matching of the high-voltage tube, the replication of the current mirror needs a low-voltage tube to ensure the replication accuracy. [0003] figure 1 A prior art high-voltage cascaded current mirror circuit is described, which includes high-voltage NMOS (N-channel Metal Oxide Semiconductor) transistors MNHV3 and MNHV4 and low-voltage NMOS transistors MN1 and MN2. Generally, high-voltage NMOS transistors are manufactured using high-voltage MOS technology, which can withstand higher voltages, such as 30V, and low-voltage NMOS transistors are manufactured using low-voltage MOS processes, which can ...

AI Technical Summary

Problems solved by technology

If a smaller resistor is used, the current value of I1 needs to be increased, which is not conducive to low power consumption design

Images