• 沒有找到結果。

於本篇論文所談到的關於 CT ΣΔ modulator 設計的過程中,從一開始係數 上的決定,已將 CT excess loop delay 的影響計算在其內而做了修正。接著在 MATLAB 的模擬環境中,我們建立了有關有限增益頻寬,jitter,RC 時間常數和 各路徑係數的變動,以及考慮到電阻電容匹配性影響的 behavioral model。另 外 也 對 於 MATLAB single-ended 的 模 擬 環 境 , 對 應 到 電 路 上 以 fully- differential 的方式來實現所得到的模擬結果(主要在於 mismatch 上的模擬)做 了分析。最後根據 MATLAB 模擬所訂定的規格,在 HSPICE 上設計的電路,對於探 討到的各項非理想效應所得到的模擬結果,也有良好的對應性。

除了非理想效應的探討,針對不同的架構也做了比較。在我們所使用的 half-delay 架構上來看,無論是二階或是三階的系統,除了所需要的元件規格 較 unit-delay 的架構來得低之外。在對於 RC variation 的容忍度也有較大的範 圍。而係數上的 variation,我們則使用電容式的加法電路,利用其製程上的優 勢,即可做到在比例上的精準度,將其影響減到最低。省去了在電阻加法電路的 做法中所需要的運算放大器,同時也減低了功率的消耗。

而所討論到的 feed-forward 以及 feed-back 的差異性,即 CRFF 和 CRFB。

而無論兩者之間選擇何架構在設計上,都可以達到所預期的規格。但是由於抗 variation 以及消耗功率上,較偏好使用 CRFF 的架構。

最後本篇論文中在 HSPICE 上模擬得到的 CT SDM 為:

(1)250 kHz, 4mW, 83dB SNDR 3rd-order in CRFF form (2)250 kHz, 6mW, 76dB SNDR 3rd-order in CRFB form

參考文獻:

[1] S.R. Norsworthy, R. Schreier and G.C. Temes, Delta-Sigma Data Converters:

Theory, Design, and Simulation, 1996

[2] P. Benabes, M. Keramat and R. Kielbasa, “A Methodology for designing continuous-time sigma- delta modulators,” European Design and Test Conference (ED&TC 97), pp. 46-50, Paris, 1997

[3] M.S. Kappes, “A 2.2-mW CMOS Bandpass Continuous-Time Multibit Δ-Σ ADC with 68 dB of Dynamic Range and 1-MHz Bandwidth for Wireless Applications,” IEEE Journal of Solid-State Circuits, Vol. 38, pp. 1098-1104, July 2003.

[4] J.A. Cherry and W.M. Snelgrove, Continuous-Time Delta-Sigma Modulators for

High-Speed A/D Conversion, 2000.

[5] L. Breems and J.H. Huising, Continuous-Time Sigma-Delta Modulation for A/D

Conversion in Radio Receivers, 2001.

[6] K. Philips, “A 4.4mW 76dB Complex ΣΔ ADC for Bluetooth Receivers,”IEEE ISSCC, Vol. 1, pp. 64- 478, 2003.

[7] J. Arias and etc, “A 32-mW 320-MHz Continuous-Time Complex Delta-Sigma ADC for Multi-Mode Wireless-LAN Receivers,” IEEE JSSC, Vol. 41, No. 2, pp.

339-351, Feb. 2006.

[8] G. Mitteregger and etc, “A 14b 20mW 640MHz CMOS CT ΔΣ ADC with 20MHz Signal Bandwidth and 12b ENOB,” IEEE ISSCC, 2006.

[9] S. Brigati, F. Francesconi, P. Malcovati, D. Tonietto, A. Baschirotto and F.

Maloberti, “Modeling Sigma Delta modulator Non-Idealities in SIMULINK®,”IEEE ISCAS, Vol. 2, pp. 384-387, July 1999.

[10] R. Schreier,The Delta-Sigma Toolbox for MATLAB.

[11] P. Malcovati, S. Brigati, F. Francesconi, F. Maloberti, P. Cusinato and A.

Baschirotto, “Behavioral Modeling of Switched-Capacitor Sigma-Delta Modulators,”IEEE Transactions on Circuits and Systems, Vol. 50, No. 3, pp.352-364, March 2003.

[12] J.A. Cherry and W.M. Snelgrove, “Excess Loop Delay in Continuous-Time Delta-Sigma Modulators,”IEEE Transactions on Circuit and System, Vol. 46, No. 4, pp. 376-389, April 1999.

[13] J.A. Cherry and W.M. Snelgrove, “Clock Jitter and Quantizer Metastability in Contiuous-Time Delta-Sigma Modulators,”IEEE Transactions on Circuit and System, Vol. 46, No. 6, pp. 661-676, June 1999.

[14] A. Leuciuc and C. Mitrea, “On the Effect of OP-AMP Finite-Gain in Delta-Sigma modulators,”IEEE International Symposium on Circuits and Systems, Vol. 3, pp. 754-757, May 2000.

[15] A. Leuciuc, “On the Nonlinearity of Integrators in Continuous-Time Delta-Sigma Modulators,” MWSCAS, Vol. 2, pp. 862-865, 2001.

[16] M. Ortmanns, F. Gerfers and Y. Manoli, “Compensation of Finite Gain-Bandwidth Induced Errors in Continuous-Time Sigma-Delta Modulators,”

IEEE Transaction on Circuits and System, Vol. 51, No. 6, pp. 1088-1099, June 2004.

[17] O. Oliaei, “Design of Continuous-Time Sigma-Delta Modulators with Arbitrary Feedback Waveform,” IEEE Transaction on Circuit and Systems-II, Vol. 50, No.8, pp.437-444, August 2003.

[18] A. Latiri, H. Aboushady and N. Beilleau, “Design of Continuous-Time ΣΔ Modulators with Sine-Shaped Feedback DACs,” IEEE International Symposium on Circuits and Systems, Vol. 4, pp. 3672-3675, May 2005.

[19] F. Gerfers, M. Ortmanns, L. Samid and Y. Manoli, “Implementation of a 1.5V Low-Power Clock-Jitter Insensitive Continuous-Time ΣΔ Modulator,” IEEE

International Symposium on Circuits and Systems, Vol. 2, pp. II-652- II-655, 2002.

[20] M. Ortmanns, F. Gerfers and Y. Manoli, “A Continuous-Time Sigma- Delta Modulator with Switched Capacitor Controlled Current Mode Feedback,” IEEE ESSCIRC, pp. 249-252, Sept. 2003.

[21] S. Paton, and etc, “A 70-mW 300-MHz CMOS Continuous-Time ΣΔ ADC with 15-MHz Bandwidth and 11 Bits of Resolution,” IEEE JSSC, Vol. 39, No. 7, pp.

1056-1063, July 2004.

[22] J. Ruiz-Amaya and etc, “MATLAB/SIMULINK-Based High-Level Synthesis of Discrete-Time and Continuous-Time ΣΔ Modulators,”IEEE Automation and Test in Europe Conference and Exhibition Designers’ Forum, pp. 1530-1591, 2004.

[23] L. Hernandez, A. Wiesbauer, S. Paton and A. Di Giandomenico, “Modelling and Optimization of Low Pass Continuous-Time Sigma-Delta Modulators for Clock Jitter Noise Reduction,” IEEE ISCAS, Vol. 1, pp. I-1072-5, May 2004.

[24] H. Aboushady and Marie-Minerve Louerat, “Systematic approach for discrete- time to continuous-time transformation of /spl Sigma//spl Delta/ modulators,”

IEEE ISCAS, vol. 4 pp. IV-229- IV-232, May 2002

[25] O. Oliaei, “Design of Continuous-Time Sigma-Delta Modulators with Arbitrary Feedback Waveform,” IEEE TCAS-II, Vol. 50, No. 8, pp. 437-444, August 2003.

[26] A. Latiri, H. Aboushady and N. Beilleau, “Design of Continuous-Time ΣΔ Modulators with Sine-Shaped Feedback DACs,”IEEE ISCAS, pp.3672-3675, May 2005.

[27] S. Yan and E. Sanchez-Sinencio, “A Continuous-Time ΣΔ with 88-dB Dynamic Range and 1.1-MHz Signal Bandwidth,” IEEE JSSC, Vol. 39, No. 1, Jan. 2004.

[28] N. Beilleau, H Aboushady and M.M. Louerat, “Filtering Adjacent Channel Blockers using Signal-Transfer-Function of Continuous-Time ΣΔ Modulators,”

IEEE MWSCA, Vol. 1, pp. I- 329-32, July 2004.

[29] F, Munoz, K. Philips and A. Torralba, “ A 4.7mW 89.5dB DR CT Complex ΔΣ ADC with Built-In LPF,” IEEE ISSCC, Vol.1, pp. 500-613, Feb. 2005.

[30] F. Gerfers, M. Ortmanns and Y. Manoli, “A 1.5-V 12-bit Power-Efficient Continuous-Time Third-Order ΣΔ Modulator,” IEEE JSSC, Vol. 38, No. 8, pp.

1343-1352, August 2003.

[31] J.H. Nielsen and E. Bruun, “A Low-Power 10-bit Continuous-Time CMOS ΣΔ A/D Converter,” IEEE ISCAS, Vol. 1, pp. I- 417-20, May 2004

[32] L. Samid and Y. Manoli, “A Micro Power Continuous-Time ΣΔ Modulator,”

IEEE ESSCIRC, pp. 165-168, Sept. 2003.

[33] M. Schimper, L. Dorrer, E. Riccio and G. Panov, “A 3mW Continous-Time ΣΔ-Modulator for EDGE/GSM with High Adjacent Channel Tolerance,” IEEE ESSCIRC, pp.183-186, Sept. 2004.

[34] F. Esfahani, P. Basedau, R. Ryter and R. Becker, “An 82 dB CMOS Continuous-Time Complex Bandpass Sigma-Delta ADC for GSM/EDGE,”

IEEE ISCAS, Vol. 1, pp. I- 1049-52, May 2003.

[35] Robert H. M. van Veldhoven, “A Triple-Mode Continuous-Time ΣΔ Modulator with Switched-Capacitor Feedback DAC for a GSM-EDGE/

CDMA2000/UMTS Receiver,” IEEE JSSC, Vol. 38, No. 12, pp. 2069-2076, Dec. 2003.

[36] L.J. Breems, E.J. van der Zwan and J.H. Huijsing, “A 1.8-mW CMOS ΣΔ Modulator with Integrated Mixer for A/D Conversion of IF Signals,” IEEE JSSC, Vol. 35, No. 4, pp. 468-475, April 2000.

[37] L. Dorrer and etc, “10-Bit, 3 mW Continuous-Time Sigma-Delta ADC for

UMTS in a 0.12μm CMOS Process,” IEEE ESSCIRC, pp. 245-248, Sept. 2003.

[38] D.A. Jones and K. Martin, Analog Integrated Circuit Desing, John Wiley &

Sons, Inc., 1997.

[39] M. Ortmanns, F. Gerfers, L. Samid and Y. Manoli, “Successful Design of Cascaded Continuous-Time ΣΔ Modulators,” IEEE ICECS, Vol. 1, pp. 321-324, 2001.

[40] M. Ortmanns, F. Gerfers and Y. Manoli, “Influence of Finite Integrator Gain Bandwidth on Continuous-Time Sigma Delta Modulators,” IEEE ISCAS, Vol. 1, pp. I- 925-928, May 2003.

[41] M. Ortmanns, F. Gerfers and Y. Manoli, “Compensation of Finite Gain-Bandwidth Induced Errors in Continuous-Time Sigma-Delta Modulators,”

IEEE TCAS-I, Vol. 51, No. 6, pp. 1088-1099, June 2004.

[42] L. Hernandez, A. Wiesbauer, S. Paton and A. Di Giandomenico,” Modelling and Optimization of Low Pas Continuous-Time Sigma-Delta Modulators for Clock Jitter noise Reduction,” IEEE ISCAS, Vol. 1, pp. I- 1072-5, May 2004.

[43] W. Gao, O. Shoaei and W.M. Snelgrove, “Excess Loop Delay Effects in Continuous-Time Delta-Sigma Modulators and the Compensation Solution,”

IEEE ISCAS, Vol. 1,pp. 66-68, June 1997.

[44] L. Hernandez, “Continuous-Time Noise-Shaping Modulators with Delay Elements,” IEEE ISCAS, Vol. 5, pp. 565-568, May 2000.

[45] A. Marques, V. Peluso, M.S. Steyaert and W.M. Sansen, “Optimal Parameters for ΔΣ Modulator Topologies,” IEEE TCAS-II, Vol. 45, No. 9, pp. 1232-1241, Sept. 1998.

[46] G. Fischer and A.J. Davis, “Alternative Topologies for Sigma-Delta Modulators-A Comparative Study,” IEEE TCAS-II, Vol. 44, No.10, pp.789-797, Oct. 1997.

[47] L.J. Breems, R. Rutten and G. Wetzker, “A Cascaded Continuous-Time ΣΔ Modulator With 67-dB Dynamic Range in 10-MHz Bandwidth,” IEEE JSSC, Vol. 39, No. 12, pp. 2152-2160, Dec. 2004.

[48] M. Ortmanns, M. Kuderer and Y. Manoli, “A Cascaded Continuous-Time ΣΔ Modulator with 80 dB Dynamic Range,” IEEE ISCAS, pp. I- 405-408, 2004.

[49] M. Ortmanns, F. Gerfers and Y. Manoli, “A Case Study on a 2-1-1 Cascaded Continuous-Time Sigma-Delta Modulator,” IEEE TCAS-I, Vol. 52, No. 8, pp.

1515-1525, August 2005.

[50] R. Tortosa and etc, “A Direct Synthesis Method of Cascaded Continuous-Time Sigma-Delta Modulators,” IEEE ISCAS, Vol. 6, pp. 5585-5588, May 2005.

[51] M. Ortmanns, L. Samid and Y. Manoli, “Multirate Cascaded Continuous-Time ΣΔ Modulators,” IEEE ISCAS, Vol. 4, pp. IV- 225-228, 2002.

[52] M. Ortmanns, F. Gerfers and Y. Manoli, “On the Synthesis of Cascaded Continuous-Time ΣΔ Modulators,” IEEE ISCAS, Vol. 5, pp. 419-422, 2001.

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