CMOS based Ultra-low Power High-Precision Analog Vector Matrix Multiplication Circuit with ±0.1% Error for Vision Application

This paper presents the design of a low power multiplier cell which multiplies an input voltage with current. The multiplier achieves high precision with ±0.1% error for a wide range of both voltage and current. An approach to increase the range of the current is also presented. The multiplier cell is used to perform 2-D discrete convolution on an input matrix of size 3×3 with a 2×2 kernel. The outputs of the matrix multiplier are available after 7.5 µs, which is independent of the matrix size.