A single shot ΣΔ architecture for multiplexed applications

This paper presents an alternative single shot ΣΔ ADC architecture. The architecture is targeted at applications, such as industrial automation, where it is desirable to multiplex inputs from a number of independent sources. The “single shot” ΣΔ does not require filter settling and so maximises the overall conversion rate for multiplexed applications. Results are presented for a fourth order ΣΔ modulator which achieves 16 bit resolution with an oversampling rate of 200 samples per conversion. The circuit produces a new conversion every 350 microseconds