A wide-band low phase noise LC-tuned VCO with constant KVCO/ωosc for LTE PLL

Huang Jiwei; Wang Zhigong; Li Kuili; Li Zhengping; Wang Yongping

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

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

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A wide-band low phase noise LC-tuned VCO with constant K_VCO/ω_osc for LTE PLL

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

+ Author Affiliations

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

Abstract: A wideband LC-tuned voltage-controlled oscillator (LC-VCO) applied in LTE PLL frequency synthesizers with constant K_VCO/ω_osc 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 V_tune or V_DD. The switches are controlled by switching bits. With this scheme, the ratio of K_V= ∂ C_var/∂ V_tune 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 K_VCO/ω_osc 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 oscillator, loop bandwidth, LTE, K_VCO, low phase noise

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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 K_VCO/ω_osc 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.

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

A wideband LC-tuned voltage-controlled oscillator (LC-VCO) applied in LTE PLL frequency synthesizers with constant K_VCO/ω_osc 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 V_tune or V_DD. The switches are controlled by switching bits. With this scheme, the ratio of K_V= ∂ C_var/∂ V_tune 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 K_VCO/ω_osc 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.

A wide-band low phase noise LC-tuned VCO with constant K_VCO/ω_osc for LTE PLL

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A wide-band low phase noise LC-tuned VCO with constant K_VCO/ω_osc for LTE PLL

A wide-band low phase noise LC-tuned VCO with constant K_VCO/ω_osc for LTE PLL