Advanced search
1 file | 939.11 KB

A 5-MHz 11-Bit Self-Oscillating sigma delta modulator with a delay-based phase shifter in 0.025 mm(2)

Bart De Vuyst (UGent) and Pieter Rombouts (UGent)
Author
Organization
Abstract
Self-oscillating Sigma Delta modulators are a class of Sigma Delta modulators that combines noise shaping with pulsewidth modulation (PWM). Moreover, in such a modulator, the PWM carrier is generated by a self-oscillation mode that is deliberately introduced. In our approach, this self-oscillation is accurately controlled by a digital delay in the feedback loop. The concept is elaborated for a second-order self-oscillating Sigma Delta modulator with 5-MHz bandwidth. Here, the clock frequency equals 850 MHz, but the loop only has to process signals that are maximally at the self-oscillation frequency (at 106.25 MHz). An additional key element in this design is the use of a feedback FIRDAC which reduces the jitter sensitivity and further relaxes the slewing requirements of the first opamp in the loop. The prototype modulator is fabricated in a 0.18-mu m CMOS process and achieves a dynamic range of 66 dB. Due to the simplicity of the circuit, the modulator core area is only 0.025 mm(2). The power consumption of the modulator is 6 mW.
Keywords
5-BIT, 12-BIT, CYCLE, A/D conversion, pulsewidth modulation, self-oscillation, Sigma Delta modulation, QUANTIZER, ADC, CLOCK JITTER, MU-M CMOS, TO-DIGITAL CONVERSION, BANDWIDTH, FEEDBACK

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 939.11 KB

Citation

Please use this url to cite or link to this publication:

Chicago
De Vuyst, Bart, and Pieter Rombouts. 2011. “A 5-MHz 11-Bit Self-Oscillating Sigma Delta Modulator with a Delay-based Phase Shifter in 0.025 Mm(2).” Ieee Journal of Solid-state Circuits 46 (8): 1919–1927.
APA
De Vuyst, Bart, & Rombouts, P. (2011). A 5-MHz 11-Bit Self-Oscillating sigma delta modulator with a delay-based phase shifter in 0.025 mm(2). IEEE JOURNAL OF SOLID-STATE CIRCUITS, 46(8), 1919–1927.
Vancouver
1.
De Vuyst B, Rombouts P. A 5-MHz 11-Bit Self-Oscillating sigma delta modulator with a delay-based phase shifter in 0.025 mm(2). IEEE JOURNAL OF SOLID-STATE CIRCUITS. 2011;46(8):1919–27.
MLA
De Vuyst, Bart, and Pieter Rombouts. “A 5-MHz 11-Bit Self-Oscillating Sigma Delta Modulator with a Delay-based Phase Shifter in 0.025 Mm(2).” IEEE JOURNAL OF SOLID-STATE CIRCUITS 46.8 (2011): 1919–1927. Print.
@article{1893852,
  abstract     = {Self-oscillating Sigma Delta modulators are a class of Sigma Delta modulators that combines noise shaping with pulsewidth modulation (PWM). Moreover, in such a modulator, the PWM carrier is generated by a self-oscillation mode that is deliberately introduced. In our approach, this self-oscillation is accurately controlled by a digital delay in the feedback loop. The concept is elaborated for a second-order self-oscillating Sigma Delta modulator with 5-MHz bandwidth. Here, the clock frequency equals 850 MHz, but the loop only has to process signals that are maximally at the self-oscillation frequency (at 106.25 MHz). An additional key element in this design is the use of a feedback FIRDAC which reduces the jitter sensitivity and further relaxes the slewing requirements of the first opamp in the loop. The prototype modulator is fabricated in a 0.18-mu m CMOS process and achieves a dynamic range of 66 dB. Due to the simplicity of the circuit, the modulator core area is only 0.025 mm(2). The power consumption of the modulator is 6 mW.},
  author       = {De Vuyst, Bart and Rombouts, Pieter},
  issn         = {0018-9200},
  journal      = {IEEE JOURNAL OF SOLID-STATE CIRCUITS},
  keyword      = {5-BIT,12-BIT,CYCLE,A/D conversion,pulsewidth modulation,self-oscillation,Sigma Delta modulation,QUANTIZER,ADC,CLOCK JITTER,MU-M CMOS,TO-DIGITAL CONVERSION,BANDWIDTH,FEEDBACK},
  language     = {eng},
  number       = {8},
  pages        = {1919--1927},
  title        = {A 5-MHz 11-Bit Self-Oscillating sigma delta modulator with a delay-based phase shifter in 0.025 mm(2)},
  url          = {http://dx.doi.org/10.1109/JSSC.2011.2151430},
  volume       = {46},
  year         = {2011},
}

Altmetric
View in Altmetric
Web of Science
Times cited: