Pseudo-Pseudo-Differential Implementation of a Low-distortion Second Order Delta-Sigma Modulator

Recently pseudo-pseudo-differential (PPD) circuits were introduced as a means to obtain performances inherent to fully-differential (FD) and pseudo-differential (PD) structures, but with a power-efficiency comparable to those of single-ended (SE) ones. Some of the key benefits of this time-interleaved sampled-data technique include reduction of low-frequency noise as well as even-distortion and potentially less number of required pins and pads of the chip. Moreover, depending on the application, it can directly allow for single-ended implementations, exploiting the simplicity and efficiency of inverter-based circuits, while avoiding the use of common-mode feedback blocks. This work adopts a low-distortion multi-bit discrete-time second-order delta-sigma modulator ADC with 20 kHz bandwidth and an oversampling-ratio of 128 and compares the performance of its implementation using PPD, PD and SE techniques.

Major Advisor: Gabor Temes
Committee: David Allstot
Committee: Un-Ku Moon
Committee: Matthew Johnston
GCR: Nathan Gibson