SEMICONDUCTOR INTEGRATED CIRCUITS

Wide band low phase noise QVCO based on superharmonic injection locking

Yalan Xu1, 2, Jinguang Jiang1, and Jianghua Liu1

+ Author Affiliations

 Corresponding author: Jiang Jinguang,Email:jgjiang09@aliyun.com

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Abstract: A wide band, injection-coupled LC quadrature voltage control oscillator is presented. In the proposed circuit, two oscillators are injection locked by coupling their second-order harmonics in anti-phase, forcing the outputs of two oscillators into a quadrature phase state. As the common-mode point sampling the second harmonic frequency, flicker noise of the tail current is suppressed, the phase noise is reduced.The proposed design accomplishes a wide tuning frequency range by a combination of using a 5-bit switch capacitor array (SCA) for discrete tuning in addition to linearly varying AMOS varactors for continuous tuning. The proposed design has been fabricated and verified in a 0.18 μ m TSMC CMOS technology process. The measurement indicates that the quadrature voltage controlled oscillator has a 41.7% tuning range from 3.53 to 5.39 GHz. The measured phase noise is 127.98 dBc/Hz at 1 MHz offset at a 1.8 V supply voltage with a power consumption of 12 mW at a carrier frequency of 4.85 GHz.

Key words: QVCOinjection lockingswitch capacitor array (SCA)phase noisewideband



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Fig. 1.  .Theory illustration of injection locking. (a) Conceptual oscillator. (b) Frequency shift due to injection. (c) Vector diagram. (d) Reduction of phase noise due to injection locking.

Fig. 2.  Schematic of the conventional cross coupled QVCO.

Fig. 3.  Schematic of designed circuit. (a) QVCO based on super-harmonic injection locking. (b) Schematic of frequency doubler.

Fig. 4.  Block diagram of circuit in Figure 3.

Fig. 5.  Schematic of MOS capacitor SCA.

Fig. 6.  Physical layout of capacitor array.

Fig. 7.  Frequency tuning curves of proposed QVCO.

Fig. 8.  Four phase signal.

Fig. 9.  Simulated and measured result of designed QVCO under superharmonic injection locking. (a) Simulated result of phase noise. (b) Measured result of phase noise. (c) Measured output Spectrum of the QVCO.

Fig. 10.  Die photograph of QVCO.

Table 1.   Comparison of QVCO performance, recently published and this work.

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    Received: 24 March 2015 Revised: Online: Published: 01 January 2016

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      Yalan Xu, Jinguang Jiang, Jianghua Liu. Wide band low phase noise QVCO based on superharmonic injection locking[J]. Journal of Semiconductors, 2016, 37(1): 015002. doi: 10.1088/1674-4926/37/1/015002 Y L Xu, J G Jiang, J H Liu. Wide band low phase noise QVCO based on superharmonic injection locking[J]. J. Semicond., 2016, 37(1): 015002. doi: 10.1088/1674-4926/37/1/015002.Export: BibTex EndNote
      Citation:
      Yalan Xu, Jinguang Jiang, Jianghua Liu. Wide band low phase noise QVCO based on superharmonic injection locking[J]. Journal of Semiconductors, 2016, 37(1): 015002. doi: 10.1088/1674-4926/37/1/015002

      Y L Xu, J G Jiang, J H Liu. Wide band low phase noise QVCO based on superharmonic injection locking[J]. J. Semicond., 2016, 37(1): 015002. doi: 10.1088/1674-4926/37/1/015002.
      Export: BibTex EndNote

      Wide band low phase noise QVCO based on superharmonic injection locking

      doi: 10.1088/1674-4926/37/1/015002
      More Information
      • Corresponding author: Jiang Jinguang,Email:jgjiang09@aliyun.com
      • Received Date: 2015-03-24
      • Accepted Date: 2015-08-24
      • Published Date: 2016-01-25

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