17 bit 4.35 mW 1 kHz Delta Sigma ADC and 256-to-1 multiplexer for remote handling instrumentation equipment

Abstract

A radiation tolerant Delta-Sigma Analog-to-Digital Converter (ADC) and multiplexer is presented. The design features a 1.5V, 17 bit ADC consuming 4.35mW at a sample frequency of 1MHz. The ADC features a bandwidth of 1kHz and utilizes a Correlated Double Sampling technique (CDS) to remove offset and 1/f noise. The circuit maintains its 17 bit resolution upon a simulated radiation dose exceeding 1MGy and varying temperatures between 0°C and 85°C. Next a multiplexer is presented. It can multiplex 256 channels at a clock frequency of 128MHz or has a data throughput of 256MSample/s. In addition the bit period of the multiplexer varies less then 1.5% due to the influence of temperature or radiation, which proves the temperature and radiation tolerance.