SEMICONDUCTOR INTEGRATED CIRCUITS

A fully integrated CMOS VCXO-IC with low phase noise, wide tuning range and high tuning linearity

Yanjun Yang and Yun Zeng

+ Author Affiliations

 Corresponding author: Yanjun Yang, Email: leo.yyj@gmail.com

PDF

Abstract: This paper describes a low phase noise, wide tuning range and high tuning linearity CMOS voltage controlled crystal oscillator IC (VCXO-IC) with LVCMOS or LVPECL output. A differential coupled frequency doubling Colpitts oscillator is adopted to obtain low noise 2 × frequency output. A wide tuning range and high linearity are simultaneously achieved by using MOS varactor arrays. The measurement results show that the designed VCXO-IC achieves-134 dBc/Hz phase noise at 1 kHz offset frequency and ± 135 ppm output frequency tuning range within 3% linearity by using 40 MHz fundamental AT-cut crystal. The VCXO-IC is fabricated in the chartered 0.35 μm standard CMOS process and occupies a total silicon area of 2.4 mm2.

Key words: VCXOvaractorlinear frequency tuninglow phase noise



[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
Fig. 1.  Proposed VCXO block diagram.

Fig. 2.  Crystal model.

Fig. 3.  Differential frequency doubling VCXO core. (a) Control voltage $V_{\rm C}$ level shifter. (b) Frequency doubling $g_{\rm m}$-boosting differential GS-Colpitts. (c) Output buffer.

Fig. 4.  (a) Simulated $C$-$V$ curves of $C_{\rm 1L}$, $C_{\rm 2L}$, and $C_{\rm 3L}$. (b) Simulated overall $C$-$V$ curve at the Xtalp node.

Fig. 5.  (a) Simplified topology to calculate negative input impedance and (b) small signal equivalent circuit.

Fig. 6.  Amplitude regulator.

Fig. 7.  Buffer with rail-to-rail input and output.

Fig. 8.  VCXO IC operates in (a) LVCMOS mode and (b) LVPECL mode.

Fig. 9.  LVCMOS output driver.

Fig. 10.  LVPECL output driver.

Fig. 11.  Timing diagram of LVPECL output driver.

Fig. 12.  Chip die microphotograph.

Fig. 13.  PCB test board.

Fig. 14.  Measured waveform of LVCMOS output with 15 pF capacitor load.

Fig. 15.  Measured waveform of LVPECL output.

Fig. 16.  Measured output spectrum.

Fig. 17.  Measured frequency-voltage curve (solid line) and fitting curve (dashed line).

Fig. 18.  Measured phase noise of LVPECL output.

DownLoad: CSV
DownLoad: CSV
DownLoad: CSV
DownLoad: CSV
DownLoad: CSV

Table 1.   Simulated performance summary

DownLoad: CSV
DownLoad: CSV

Table 2.   Measured performance summary.

DownLoad: CSV

Table 3.   Performance comparison between that in Reference [17] and the present work.

DownLoad: CSV
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
  • Search

    Advanced Search >>

    GET CITATION

    shu

    Export: BibTex EndNote

    Article Metrics

    Article views: 2540 Times PDF downloads: 23 Times Cited by: 0 Times

    History

    Received: 02 November 2014 Revised: Online: Published: 01 June 2015

    Catalog

      Email This Article

      User name:
      Email:*请输入正确邮箱
      Code:*验证码错误
      Yanjun Yang, Yun Zeng. A fully integrated CMOS VCXO-IC with low phase noise, wide tuning range and high tuning linearity[J]. Journal of Semiconductors, 2015, 36(6): 065009. doi: 10.1088/1674-4926/36/6/065009 Y J Yang, Y Zeng. A fully integrated CMOS VCXO-IC with low phase noise, wide tuning range and high tuning linearity[J]. J. Semicond., 2015, 36(6): 065009. doi: 10.1088/1674-4926/36/6/065009.Export: BibTex EndNote
      Citation:
      Yanjun Yang, Yun Zeng. A fully integrated CMOS VCXO-IC with low phase noise, wide tuning range and high tuning linearity[J]. Journal of Semiconductors, 2015, 36(6): 065009. doi: 10.1088/1674-4926/36/6/065009

      Y J Yang, Y Zeng. A fully integrated CMOS VCXO-IC with low phase noise, wide tuning range and high tuning linearity[J]. J. Semicond., 2015, 36(6): 065009. doi: 10.1088/1674-4926/36/6/065009.
      Export: BibTex EndNote

      A fully integrated CMOS VCXO-IC with low phase noise, wide tuning range and high tuning linearity

      doi: 10.1088/1674-4926/36/6/065009
      Funds:

      Project supported by the National Natural Science Foundation of China (No. 61350007).

      More Information
      • Corresponding author: Email: leo.yyj@gmail.com
      • Received Date: 2014-11-02
      • Accepted Date: 2014-12-11
      • Published Date: 2015-01-25

      Catalog

        /

        DownLoad:  Full-Size Img  PowerPoint
        Return
        Return