J. Semicond. > 2012, Volume 33 > Issue 2 > 025008

SEMICONDUCTOR INTEGRATED CIRCUITS

A wide-band low phase noise LC-tuned VCO with constant KVCOosc for LTE PLL

Huang Jiwei, Wang Zhigong, Li Kuili, Li Zhengping and Wang Yongping

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DOI: 10.1088/1674-4926/33/2/025008

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Abstract: A wideband LC-tuned voltage-controlled oscillator (LC-VCO) applied in LTE PLL frequency synthesizers with constant KVCOosc is described. In order to minimize the loop bandwidth variations of PLL, a varactor array is proposed, which consists of a series of differential variable capacitor pairs and a series of single-pole double-throw (SPDT) switches to connect Vtune or VDD. The switches are controlled by switching bits. With this scheme, the ratio of KV= ∂ Cvar/∂ Vtune and the capacitance value of the capacitor array maintains relatively constant; furthermore, the loop bandwidth of the PLL fluctuation is suppressed. The 3.2-4.6-GHz VCO for multi-band LTE PLL is fabricated in a 0.13-μ m RF-CMOS process. The VCO exhibits a maximum variation of KVCOosc of only ±4%. The VCO also exhibits a low phase-noise of -124 dBc/Hz at a 1-MHz offset frequency and a low current consumption of 18.0 mA with a 1.2-V power supply.

Key words: voltage-controlled oscillatorloop bandwidthLTEKVCOlow phase noise

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    Received: 20 August 2015 Revised: 10 October 2011 Online: Published: 01 February 2012

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      Huang Jiwei, Wang Zhigong, Li Kuili, Li Zhengping, Wang Yongping. A wide-band low phase noise LC-tuned VCO with constant KVCO/ωosc for LTE PLL[J]. Journal of Semiconductors, 2012, 33(2): 025008. doi: 10.1088/1674-4926/33/2/025008 ****Huang J W, Wang Z G, Li K L, Li Z P, Wang Y P. A wide-band low phase noise LC-tuned VCO with constant KVCO/ωosc for LTE PLL[J]. J. Semicond., 2012, 33(2): 025008. doi: 10.1088/1674-4926/33/2/025008.
      Citation:
      Huang Jiwei, Wang Zhigong, Li Kuili, Li Zhengping, Wang Yongping. A wide-band low phase noise LC-tuned VCO with constant KVCOosc for LTE PLL[J]. Journal of Semiconductors, 2012, 33(2): 025008. doi: 10.1088/1674-4926/33/2/025008 ****
      Huang J W, Wang Z G, Li K L, Li Z P, Wang Y P. A wide-band low phase noise LC-tuned VCO with constant KVCO/ωosc for LTE PLL[J]. J. Semicond., 2012, 33(2): 025008. doi: 10.1088/1674-4926/33/2/025008.

      A wide-band low phase noise LC-tuned VCO with constant KVCOosc for LTE PLL

      DOI: 10.1088/1674-4926/33/2/025008
      Funds:

      The National High Technology Research and Development Program of China (863 Program)

      • Received Date: 2015-08-20
      • Accepted Date: 2011-07-06
      • Revised Date: 2011-10-10
      • Published Date: 2012-01-20

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