A 1.2V power adaptable 95-to-67dB DR 2-2 mash delta-sigma ADC with configurable OSR

A 1.2 V 16-bit 2-2 mash delta-sigma analog-to-digital converter (ADC) for temperature sensor or audio application is implemented. For power saving, three methods are used to adjust the ADC's consumption. The serial peripheral interface (SPI) can be used to adjust the sampling frequency and the OSR in order to change the dynamic power consumption and then ADC's dynamic performance could be changed. Besides, the key block's bias current could be minimized in order to save the static power according to the specific application. The design was fabricated in a 0.13 μm CMOS process with an area of 0.91 mm2 and a power of 5.2 mW. The measurement results show that the DR of the proposed ADC can change from 95dB to 67dB with the configurable OSR from 1024 to 32. The spurious free dynamic range and signal-to-noise distortion ratio can get 99dB and 86.5 dB, respectively.