Complementary metal oxide semiconductor cascade high-gain current-to-voltage converter

Abstract

A kind of CMOS common source common bar high plus current voltage converter, The invention relates to current voltage converting technique field, it includes common source common bar current mirror composed by transistors, the common source common bar current mirror is end-to-end joint by the common source common bar current mirror composed by four PMOS transistors and the common source common bar current mirror composed by four NMOS transistors, the alternating current signal is input from the joint position of upper and lower current mirror, and imaged by two current mirrors, the output voltage equals to the product of input current and output common source common bar structure resistance. The invention converts tiny pA class current signal to mV voltage, realizes high plus with character that the output resistance of the common source common bar current mirror is big, the structure is simple and plus is big, because there is feedback resistance, problem of stability does not be taken into account.

Description

technical field [0001] The invention relates to the technical field of current-voltage converters, in particular to a complementary metal-oxide-semiconductor (CMOS) cascode high-gain current-voltage converter. Background technique [0002] In order to detect the weak current signal (pA level) output by the MEMS electric field sensor, it is necessary to design a high-gain current-voltage converter. The traditional current-voltage converter is composed of an amplifier and a feedback resistor [see: Pittet, P.; Lu, G.N.; El Mourabit, A, On-chip transimpedance preamplifier for CMOS BDJ optical detector using active enhanced impedance loads 9th International Conference on Electronics, Circuits and Systems, 2002]. In addition to the complexity of the circuit structure, high Gain requires a particularly large resistance, which takes up a lot of silicon chip area; it also needs to compromise between speed and stability, so it is necessary to design a high-gain current-voltage convert...

AI Technical Summary

Problems solved by technology

[0002] In order to detect the weak current signal (pA level) output by the MEMS electric field sensor, it is necessary to design a high-gain current-voltage converter. The traditional current-voltage converter is composed of an amplifier and a feedback resistor [see: Pittet, P.; Lu, G.N.; El Mourabit, A, On-chip transimpedance preamplifier for CMOS BDJ optical detector using active enhanced impedance loads 9th International Conference on Electronics, Circuits and Systems, 2002]. In addition to the complexity of the circuit structure, high Gain requires a particularly large resistance, which takes up a lot of silicon area; there is also a tradeoff between speed and stability, so it is necessary to design a high-gain current-voltage converter with a simple structure

Images