0.3 V 2.5 nW per Channel Current-Mode CMOS Perceptron for Biomedical Signal Processing in Amperometry

This paper describes an implementation of a preprocessor with a perceptron for applications in amperometry. The perceptron operates in the current mode, in the weak-inversion area and makes it possible to process analog current signals with values below 1 nA. This paper presents an axon structure consisting of six transistors and a programmable dendrite with a fully digital interface implementing weights with an accuracy of 0.13%. The perceptron implemented in the 65-nm CMOS technology is characterized by a power consumption of 2.5 nW per channel. The data processing frequency of the perceptron equals 1k samples/s. The structure of the preprocessor makes it possible to implement it using a standard digital CMOS technology. The operation of the preprocessor was discussed using an example of a current signal monitor recognizing specified events. This paper discusses the perceptron sensitivity to the dispersion of the supply voltage and operating temperature.