A Precise Analog Multiplication Circuit Module for the Pressure Sensor’s Linearization

Abstract

In this paper, an 8-bit current-steering digital-to-analog converter for pressure sensor’s analog linearization is proposed. The circuit adopts a 7bit-Sign segmented structure and is built on Cadence. The lower four bits are coded by binary, the higher three bits are coded by unary, and the sign bit is used to control the rise and fall of the steps to complete the function of the 8-bit DAC, which greatly reduces the layout area and improves the circuit accuracy. The circuit mainly includes a decoding circuit, unit current cells and switches, high-gain operational amplifier and sign bit circuit. Finally, the dynamic and static characteristics of this DAC are calculated, where differential nonlinearity(DNL) is 0 LSB, integral nonlinearity (INL) is less than 0.1 LSB and spurious-free dynamic range (SFDR) is 52dB.