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Switched-Biasing Techniques for CMOS Voltage-Controlled Oscillator

1
Department of Electronic Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Korea
2
Department of Electronic Engineering, Daegu University, Gyeongsan, Gyeongbuk 38453, Korea
*
Authors to whom correspondence should be addressed.
Sensors 2021, 21(1), 316; https://doi.org/10.3390/s21010316
Received: 19 November 2020 / Revised: 19 December 2020 / Accepted: 2 January 2021 / Published: 5 January 2021
(This article belongs to the Special Issue Advanced CMOS Integrated Circuit Design and Application)
A voltage-controlled oscillator (VCO) is a key component to generate high-speed clock of mixed-mode circuits and local oscillation signals of the frequency conversion in wired and wireless application systems. In particular, the recent evolution of new high-speed wireless systems in the millimeter-wave frequency band calls for the implementation of the VCO with high oscillation frequency and low close-in phase noise. The effect of the flicker noise on the phase noise of the VCO should be minimized because the flicker noise dramatically increases as the deep-submicron complementary metal-oxide-semiconductor (CMOS) process is scaled down, and the flicker corner frequency also increases, up to several MHz, in the up-to-date CMOS process. The flicker noise induced by the current source is a major factor affecting the phase noise of the VCO. Switched-biasing techniques have been proposed to minimize the effect of the flicker noise at the output of the VCO with biasing AC-coupled signals at the current source of the VCO. Reviewing the advantages and disadvantages reported in the previous studies, it is analyzed which topology to implement the switched-biasing technique is advantageous for improving the performance of the CMOS VCOs. View Full-Text
Keywords: CMOS; voltage-controlled oscillator; switched-biasing; flicker noise; phase noise; current source; figure-of-merit CMOS; voltage-controlled oscillator; switched-biasing; flicker noise; phase noise; current source; figure-of-merit
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MDPI and ACS Style

Kang, C.-W.; Moon, H.; Yang, J.-R. Switched-Biasing Techniques for CMOS Voltage-Controlled Oscillator. Sensors 2021, 21, 316. https://doi.org/10.3390/s21010316

AMA Style

Kang C-W, Moon H, Yang J-R. Switched-Biasing Techniques for CMOS Voltage-Controlled Oscillator. Sensors. 2021; 21(1):316. https://doi.org/10.3390/s21010316

Chicago/Turabian Style

Kang, Cheol-Woo; Moon, Hyunwon; Yang, Jong-Ryul. 2021. "Switched-Biasing Techniques for CMOS Voltage-Controlled Oscillator" Sensors 21, no. 1: 316. https://doi.org/10.3390/s21010316

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