A CMOS Field Programmable Analog Array for intelligent sensory application

Abstract

A Field-Programmable Analog Array (FPAA) architecture designed for intelligent sensory application is presented, which consists of high performance and high flexible Configurable Analog Blocks (CABs). The CAB is developed to realize both continuous-time and discrete-time circuits for achieving optimal performance in different applications. In addition to employ coarse-grained reconfigurable CAB in FPAA, a fine-grained reconfigurable amplifier in the CAB is utilized to maximize programmability and flexibility. The precision of the analog processing is enhanced by employing fat-tree interconnection network topology to minimize the number of switches used in FPAA and using correlated double sampling (CDS) techniques to suppress the offset and noise. The FPAA is designed and implemented in SMIC 0.18μm CMOS process with a 3.3 V supply voltage. An instrumental amplifier and a capacitive sensor signal readout circuit are taken as application examples. The relative precision and dynamic range of the analog processing are 97.6% and 119dB respectively.