A 100 MHz 6th Order Continuous Time Band-Pass Sigma Delta Modulator with Active Inductor based Resonators

  • Kevin Dobson 3Department of Electrical and Computer Engineering, George Washington University, Washington DC, USA
  • Shahrokh Ahmadi Department of Electrical and Computer Engineering, George Washington University
  • Mona Zaghloul Department of Electrical and Computer Engineering, George Washington University
Keywords: Sigma Delta, Active Inductor, Negative Impedance circuit.

Abstract

This paper presents a 6th order, continuous time band-pass Sigma Delta modulator in IBM 0.18 um CMOS technology. We replace traditional RLC circuits, containing low quality factor spiral inductors with high quality factor, active inductor based resonators utilizing negative impedance circuits. Pad to pad simulation of the extracted layout in Cadence yields an enhanced SNDR of 78 dB with a noise bandwidth of 18 kHz and a power consumption of 12 mW. Our modulator occupies 7.5 mm2 of chip area with pads.

 

References

C. Lelandais-Perrault, P. Benabes, J. De Gouy, R. Kielbasa, A parallel structure of a continuous-time filter for bandpass sigma-delta A/D Converters, 10th IEEE International Conference on Electronics, Sharjah (Emirates Arabes Unis), DEC. 2003.

S. Benabid, P. Benabes, High linear integrated LC filter for a continuous-time bandpass sigma-delta ADC Circuits and Systems, 2003 IEEE 46th Midwest Symposium on, pp. 291 - 294 Vol. 1, 30 Dec. 2003

Fei Yuan, CMOS Active Inductors and Transformers, Principle, Implementation, and Applications, Springer 2008

Byunghoo Jung, Harjani, R., A wide tuning range VCO using capacitive source degeneration, Circuits and Systems, 2004. ISCAS ‘04. Proceedings of the 2004 International Symposium on, Volume 4, 23-26 May 2004, Page(s): IV - 145-8 Vol.4.

Yue Wu, Xiaohui Ding, Mohammed Ismail, and Håkan Olsson, RF bandpass filter design based on CMOS active inductors, IEEE Transactions on circuits and systems—II: Analog and Digital Signal Processing, vol 50, no.12, Dec. 2003.

Richard Schreier and Gabor C. Temes, Understanding Delta-Sigma Data Converters, IEEE Press

A. P. Ryan, O. McCarthy, A novel pole-zero compensation scheme using unbalanced differential pairs, IEEE transactions on circuits and systems—I: Regular papers, vol. 51, no. 2, Feb. 2004.

R. Jacob Baker, CMOS, Circuit Design, Layout, and Simulation, IEEE Press Series on Microelectronic Systems.

P. Benabes, M. Keramat and R. Kielbasa, Synthesis and Analysis of Sigma-Delta Modulators Employing Continuous-Time Filters, Analog Integrated Circuits and Signal Processing, no. 23, pp. 141-152, Jul. 1998.

Kevin Dobson, Shahrokh Ahmadi and Mona Zaghloul, A 1.2 GHz Band-Pass Sigma Delta Analog to Digital Modulator with Active Inductor based Resonators, Lecture Notes in Engineering and Computer Science: Proceedings of The World Congress on Engineering and Computer Science 2012, WCECS 2012, 24-26 October, 2012, San Francisco, USA, pp 875-879

Haitao Dai, Differential Sensing of Substrate Noise in Mixed-Signal 0.18- um BiCMOS Technology, Electron Device Letters, IEEE, Aug. 2008, Volume 29: Issue 8, pp 898-901

Cho-Ying Lu, Silva-Rivas, J.F.; Kode, P.; Silva-Martinez, J.; Hoyos, S., A Sixth-Order 200 MHz IF Bandpass Sigma-Delta Modulator With Over 68 dB SNDR in 10 MHz Bandwidth, Solid-State Circuits, IEEE Journal of, Volume: 45, Issue: 6, 2010 , Page(s): 1122 – 1136

Quining Chen, Kamal El-Sankary and Ezz El-Masry, A UHF continuous-time current-mode band-pass delta sigma modulator based on active inductor, Circuits and Systems, 2008. MWSCAS 2008. 51st Midwest Symposium on

Published
2015-02-28
How to Cite
Dobson, K., Ahmadi, S., & Zaghloul, M. (2015). A 100 MHz 6th Order Continuous Time Band-Pass Sigma Delta Modulator with Active Inductor based Resonators. European Journal of Applied Sciences, 3(1), 10. https://doi.org/10.14738/aivp.31.999