A Low-Complexity Circuit for On-Sensor Concurrent A/D Conversion and Compression

摘要

A low-complexity circuit for on-sensor compression is presented. The proposed circuit achieves complexity savings by combining a single-slope analog-to-digital converter with a Golomb–Rice entropy encoder and by implementing a low-complexity adaptation rule. The adaptation rule monitors the output codewords and minimizes their length by incrementing or decrementing the value of the Golomb–Rice coding parameter $k$. Its hardware implementation is one order of magnitude lower than existing adaptive algorithms. The compression circuit has been fabricated using a 0.35 $muhbox{m}$ CMOS technology and occupies an area of 0.0918 $hbox{mm}^{2}$ . Test measurements confirm the validity of the design.