DocumentCode :
2266267
Title :
A novel low power hybrid loop filter for continuous-time sigma-delta modulators
Author :
Zanbaghi, Ramin ; Fiez, Terri S.
Author_Institution :
Oregon State Univ., Corvallis, OR, USA
fYear :
2009
fDate :
24-27 May 2009
Firstpage :
3114
Lastpage :
3117
Abstract :
A novel low power hybrid (Active-Passive) loop filter using the single amplifier biquad (SAB) filter is presented. This new hybrid loop filter saves power consumption by reducing the number of active elements in the continuous-time sigma-delta modulator. Also, the core biquad filter allows the loop filter of a high-order modulator to be implemented by cascading low-order biquad sections, considerably easing the design and implementation of the high-order continuous-time sigma-delta modulator. The proposed loop filter is a general type of hybrid filter which could be used for the both high and low oversampling ratios (OSRs). Experiment on a 5th-order low pass continuous-time sigma-delta modulator with a bandwidth of 30 MHz is conducted successfully and the results are presented.
Keywords :
HF amplifiers; biquadratic filters; continuous time filters; low-power electronics; sigma-delta modulation; 5th-order continuous-time sigma-delta modulator; bandwidth 30 MHz; high-order modulator; low-power hybrid loop filter; single amplifier biquad filter; Band pass filters; Bandwidth; Circuit noise; Delta-sigma modulation; Digital filters; Energy consumption; Passive networks; Power filters; Transfer functions; Voltage; Oversampling ratio; biquad filter; continuous-time; hybrid filter; sigma-delta modulator;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems, 2009. ISCAS 2009. IEEE International Symposium on
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-3827-3
Electronic_ISBN :
978-1-4244-3828-0
Type :
conf
DOI :
10.1109/ISCAS.2009.5118462
Filename :
5118462
Link To Document :
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