A Multibit Dual-Feedback CT \Delta\Sigma Modulator With Lowpass Signal Transfer Function
This paper presents a dual-feedback continuous-time delta-sigma modulator that features a signal transfer function with low sensitivity to coefficient variations. The anti-aliasing of this topology is similar to that of the feedback architecture while using only two feedback paths for modulators of...
Saved in:
Published in | IEEE transactions on circuits and systems. I, Regular papers Vol. 58; no. 9; pp. 2083 - 2095 |
---|---|
Main Authors | , |
Format | Journal Article |
Language | English |
Published |
IEEE
01.09.2011
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | This paper presents a dual-feedback continuous-time delta-sigma modulator that features a signal transfer function with low sensitivity to coefficient variations. The anti-aliasing of this topology is similar to that of the feedback architecture while using only two feedback paths for modulators of any order. The proposed architecture is a good candidate for low-power applications as it shows relaxed amplifier gain-bandwidth requirements for the first integrator. As a proof of concept, a third-order delta-sigma modulator has been implemented and tested which achieves 76 dB dynamic range over 5 MHz signal bandwidth while consuming 6 mW from a 1.2 V supply. The prototype chip, fabricated in a 130 nm CMOS process, provides 70 dB anti-aliasing with no out-of-band peaking in the signal transfer function. |
---|---|
ISSN: | 1549-8328 1558-0806 |
DOI: | 10.1109/TCSI.2011.2162464 |