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http://dx.doi.org/10.7471/ikeee.2020.24.4.975

10 GHz LC Voltage-controlled Oscillator with Amplitude Control Circuit for Output Signal  

Song, Changmin (Department of Electronic Engineering, Graduate School, Kumoh National Institute of Technology)
Jang, Young-Chan (Department of Electronic Engineering, Graduate School, Kumoh National Institute of Technology)
Publication Information
Journal of IKEEE / v.24, no.4, 2020 , pp. 975-981 More about this Journal
Abstract
A 10 GHz LC voltage-controlled oscillator (VCO), which controls an amplitude of output signal, is proposed to improve the phase noise. The proposed amplitude control circuit for the LC VCO consists of a peak detector, an amplifier, and a current source. The peak detector is performed detecting the lowest voltage of the output signal by using two diode-connected NMOSFET and a capacitor. The proposed 10 GHz LC VCO with an amplitude control circuit for output signal is designed using a 55 nm CMOS process with a supply voltage of 1.2 V. Its area is 0.0785 ㎟. The amplitude control circuit used in the proposed LC VCO reduces the amplitude variation 242 mV generated in the output signal of the conventional LC VCO to 47 mV. Furthermore, it improves the peak-to-peak time jitter from 8.71 ps to 931 fs.
Keywords
CMOS LC VCO; amplitude control; peak detector; phase noise; diode connected NMOSFET;
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