Tunable CMOS circuit, template matching module, neural spike recording system, and fuzzy logic gate

A template matching module for determining a match between an analogue neural spike signal and a programmable template, the template matching module comprising:

• a sampling element configured to sample the analogue neural spike signal at a plurality of discrete moments in time to create a plurality of signal samples, and
• a template row for storing a tunable template, the template row comprising:
• a plurality of template pixels, wherein each of the plurality of template pixels comprises a tunable complementary metal oxide semiconductor (CMOS) circuit configured to store a value, receive a respective one of the plurality of signal samples, determine whether the one of the plurality of signal samples matches the stored value, and output an output current;
• and
• an output device configured to integrate the output currents outputted by the plurality of template pixels, wherein:
• the tunable CMOS circuit comprises:
• a CMOS element configured to receive an analogue input signal, and
• a tunable load connected to the CMOS element and configured to set a switch point of the CMOS element,
• wherein the CMOS element is configured to output an output current, the output current being largest when the analogue input signal is equal to the switch point.