Complementation-metal-oxide semiconductor constant potential rectifier with rapid stability characteristic

Abstract

The invention discloses a complementation-metal-oxide semiconductor constant potential rectifier with rapid stability characteristic, relating to the weak current detection technology of sensors; the complementation-metal-oxide semiconductor constant potential rectifier comprises an operational transconductance amplifier (OTA), a NMOS tube, a switch for rapid charge, and an in-chip and out-chip voltage stabilization and noise filtration capacitor; the output end of the operational transconductance amplifier (OTA) is connected with the grid electrode of the NMOS, the source electrode of the NMOS is connected with the inverted input end of the operational amplifier, so as to form a current conveyer, and the drain electrode of the NMOS is used as the output end of a constant potential rectifier; the switch is connected at the non-inverting input end and the inverted input end of the operational transconductance amplifier in a bridging way, and the control end of the switch is connected to the setting end of the system. In the invention, the stability of the voltage of the working electrode of the sensor can be enhanced, and the circuit with any current can enter in a detection state rapidly, and the constant potential rectifier leads the drain electrode of the NMOS to close to ideal constant flow source output.

Description

technical field [0001] The invention relates to the technical field of sensor weak current detection, in particular to a fast and stable complementary metal oxide semiconductor (CMOS) potentiostat. Background technique [0002] Electrochemical biosensor is the product of the combination of biotechnology and nanoelectronic technology, and it is one of the most promising subjects in this century. Electrochemical biosensor is a device that can directly convert chemical quantities or biomass into electrical signals. It is the mainstream of the development of miniature biochemical sensors and is widely used in life science research, biomedical engineering, healthcare, food processing and the environment. monitoring and other fields. With the rapid development of micromechanical manufacturing process and microelectronics technology, biochemical micro-sensing systems have been developed towards miniaturization, intelligence, low power consumption and portability. The ultimate goal...

AI Technical Summary

Problems solved by technology

However, with the continuous development of micro-mechanical manufacturing technology, the size of the sensor, especially the size of the micro-electrode, has been continuously reduced, and the power consumption of the system has also been continuously reduced, but at the same time it has brought a very weak sensing signal, poor anti-interference ability and low signal-to-noise ratio. Therefore, higher requirements are put forward for the sensor readout circuit, especially for the potentiostat

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