A Digitally Interfaced Analog Correlation Filter System for Object Tracking Applications

This paper reports a 24 × 57 correlation filter system for object tracking applications. While digital interfacing of the input and output data enabled a standard and flexible way of communication with pre- and post-processing digital blocks, the multiply-accumulate (MAC) operations were performed in the analog domain to save power and area. The proposed system utilizes non-volatile floating-gate memories to store filter coefficients. The chip was fabricated in a 0.13-μm CMOS process and occupies 3.23 mm
²
of silicon area. The system dissipates 388.4 μW of power at a throughput of 11.3 kVec/s, achieving an energy efficiency of 25.2 pJ/MAC. Experimental results for a custom filter designed to detect vehicles are presented.