Reference spur suppression in the Integer-N frequency synthesizers by reducing periodic ripples amplitude on the VCO control voltage

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Jahangirzadeh S.; AMIRABADI A.; FARROKHI A.

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Journal Paper

Paper Information

Journal: TABRIZ JOURNAL OF ELECTRICAL ENGINEERING Year:2021 | Volume:51 | Issue:1 (95) Page(s): 61-69

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Information Journal Paper

Title

Reference spur suppression in the Integer-N frequency synthesizers by reducing periodic ripples amplitude on the VCO control voltage

Author(s)

Jahangirzadeh S. | AMIRABADI A. | FARROKHI A. | Issue Writer Certificate

Keywords

Spur suppression

reference spur

voltage controlled oscillator (VCO)

and integer-N frequency synthesizer

Abstract

To achieve a low reference spur for an Integer-N frequency synthesizer, a new spur reducing technique was proposed. To reduce the size of periodic ripples on the VCO control voltage, the low pass filter, and the charge pump were added with a spur reduction system. By lowering the amplitude of the periodic ripple on the VCO control voltage, we managed to lower the reference spur. The introduced technique removes the necessity to decrease bandwidth and CVO gain reference spur suppressing. To demonstrate the effectiveness of the proposed structure, a 2. 06 – 2. 22 GHz frequency synthesizer was used and the 180-nm CMOS technology was used for post-layout simulation. The proposed frequency synthesizer represents the reference spur of-85. 84 dBc at 20 MHz offset and phase noise of-108dBc/Hz at 200 kHz offset frequency also it is locked after 2. 8us while occupied 0. 35 mm2 of the chip area.

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APA: Copy

Jahangirzadeh, S., AMIRABADI, A., & FARROKHI, A.. (2021). Reference spur suppression in the Integer-N frequency synthesizers by reducing periodic ripples amplitude on the VCO control voltage. TABRIZ JOURNAL OF ELECTRICAL ENGINEERING, 51(1 (95)), 61-69. SID. https://sid.ir/paper/978152/en

Vancouver: Copy

Jahangirzadeh S., AMIRABADI A., FARROKHI A.. Reference spur suppression in the Integer-N frequency synthesizers by reducing periodic ripples amplitude on the VCO control voltage. TABRIZ JOURNAL OF ELECTRICAL ENGINEERING[Internet]. 2021;51(1 (95)):61-69. Available from: https://sid.ir/paper/978152/en

IEEE: Copy

S. Jahangirzadeh, A. AMIRABADI, and A. FARROKHI, “Reference spur suppression in the Integer-N frequency synthesizers by reducing periodic ripples amplitude on the VCO control voltage,” TABRIZ JOURNAL OF ELECTRICAL ENGINEERING, vol. 51, no. 1 (95), pp. 61–69, 2021, [Online]. Available: https://sid.ir/paper/978152/en

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