中国物理B ›› 2018, Vol. 27 ›› Issue (2): 27201-027201.doi: 10.1088/1674-1056/27/2/027201

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Observation of nonconservation characteristics of radio frequency noise mechanism of 40-nm n-MOSFET

Jun Wang(王军), Xiao-Mei Peng(彭小梅), Zhi-Jun Liu(刘志军), Lin Wang(王林), Zhen Luo(罗震), Dan-Dan Wang(王丹丹)   

  1. 1. School of Information Engineering, Southwest University of Science and Technology, Mianyang 621010, China;
    2. Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 收稿日期:2017-11-09 修回日期:2017-11-12 出版日期:2018-02-05 发布日期:2018-02-05
  • 通讯作者: Jun Wang E-mail:junwang@swust.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 69901003) and the Scientific Research Fund of Sichuan Provincial Education Department.

Observation of nonconservation characteristics of radio frequency noise mechanism of 40-nm n-MOSFET

Jun Wang(王军)1, Xiao-Mei Peng(彭小梅)1, Zhi-Jun Liu(刘志军)2, Lin Wang(王林)1, Zhen Luo(罗震)1, Dan-Dan Wang(王丹丹)1   

  1. 1. School of Information Engineering, Southwest University of Science and Technology, Mianyang 621010, China;
    2. Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • Received:2017-11-09 Revised:2017-11-12 Online:2018-02-05 Published:2018-02-05
  • Contact: Jun Wang E-mail:junwang@swust.edu.cn
  • About author:72.70.+m; 72.30.+q; 73.43.Fj
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 69901003) and the Scientific Research Fund of Sichuan Provincial Education Department.

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摘要： Bias non-conservation characteristics of radio-frequency noise mechanism of 40-nm n-MOSFET are observed by modeling and measuring its drain current noise. A compact model for the drain current noise of 40-nm MOSFET is proposed through the noise analysis. This model fully describes three kinds of main physical sources that determine the noise mechanism of 40-nm MOSFET, i.e., intrinsic drain current noise, thermal noise induced by the gate parasitic resistance, and coupling thermal noise induced by substrate parasitic effect. The accuracy of the proposed model is verified by noise measurements, and the intrinsic drain current noise is proved to be the suppressed shot noise, and with the decrease of the gate voltage, the suppressed degree gradually decreases until it vanishes. The most important findings of the bias non-conservative nature of noise mechanism of 40-nm n-MOSFET are as follows. (i) In the strong inversion region, the suppressed shot noise is weakly affected by the thermal noise of gate parasitic resistance. Therefore, one can empirically model the channel excess noise as being like the suppressed shot noise. (ii) In the middle inversion region, it is almost full of shot noise. (iii) In the weak inversion region, the thermal noise is strongly frequency-dependent, which is almost controlled by the capacitive coupling of substrate parasitic resistance. Measurement results over a wide temperature range demonstrate that the thermal noise of 40-nm n-MOSFET exists in a region from the weak to strong inversion, contrary to the predictions of suppressed shot noise model only suitable for the strong inversion and middle inversion region. These new findings of the noise mechanism of 40-nm n-MOSFET are very beneficial for its applications in ultra low-voltage and low-power RF, such as novel device electronic structure optimization, integrated circuit design and process technology evaluation.

关键词: nanoscale MOSFET, non-conservation characteristics, noise mechanism, radio frequency

Abstract: Bias non-conservation characteristics of radio-frequency noise mechanism of 40-nm n-MOSFET are observed by modeling and measuring its drain current noise. A compact model for the drain current noise of 40-nm MOSFET is proposed through the noise analysis. This model fully describes three kinds of main physical sources that determine the noise mechanism of 40-nm MOSFET, i.e., intrinsic drain current noise, thermal noise induced by the gate parasitic resistance, and coupling thermal noise induced by substrate parasitic effect. The accuracy of the proposed model is verified by noise measurements, and the intrinsic drain current noise is proved to be the suppressed shot noise, and with the decrease of the gate voltage, the suppressed degree gradually decreases until it vanishes. The most important findings of the bias non-conservative nature of noise mechanism of 40-nm n-MOSFET are as follows. (i) In the strong inversion region, the suppressed shot noise is weakly affected by the thermal noise of gate parasitic resistance. Therefore, one can empirically model the channel excess noise as being like the suppressed shot noise. (ii) In the middle inversion region, it is almost full of shot noise. (iii) In the weak inversion region, the thermal noise is strongly frequency-dependent, which is almost controlled by the capacitive coupling of substrate parasitic resistance. Measurement results over a wide temperature range demonstrate that the thermal noise of 40-nm n-MOSFET exists in a region from the weak to strong inversion, contrary to the predictions of suppressed shot noise model only suitable for the strong inversion and middle inversion region. These new findings of the noise mechanism of 40-nm n-MOSFET are very beneficial for its applications in ultra low-voltage and low-power RF, such as novel device electronic structure optimization, integrated circuit design and process technology evaluation.

Key words: nanoscale MOSFET, non-conservation characteristics, noise mechanism, radio frequency

中图分类号:  (Noise processes and phenomena)

  • 72.70.+m
72.30.+q (High-frequency effects; plasma effects) 73.43.Fj (Novel experimental methods; measurements)