Title :
A Low-Phase-Noise CMOS Quadrature Voltage-Controlled Oscillator Using a Self-Injection-Coupled Technique
Author :
Lin, Chi-Hsien ; Chang, Hong-Yeh
Author_Institution :
Dept. of Electr. Eng., Nat. Central Univ., Jhongli, Taiwan
Abstract :
A modified coupled method for multiphase oscillator is proposed and demonstrated in a standard 0.18-μm CMOS technology. A self-injection-coupled (SIC) technique is used to couple two current-reused differential voltage-controlled oscillators (VCOs). Compared with the conventional parallel-coupled quadrature VCO (QVCO), the proposed QVCO using the SIC technique presents low phase noise without increasing dc power consumption. The proposed SIC-QVCO at 16.28 GHz demonstrated a low phase noise of -125 dBc/Hz at 1-MHz offset frequency and a tuning range of 290 MHz. The dc supply voltage and current consumption are 1.8 V and 6 mA, respectively. The chip size of the proposed SIC-QVCO is 0.75 × 0.6 mm2.
Keywords :
CMOS analogue integrated circuits; microwave integrated circuits; microwave oscillators; voltage-controlled oscillators; QVCO; SIC technique; current 6 mA; current-reused differential voltage-controlled oscillators; frequency 1 MHz; frequency 16.28 GHz; frequency 290 MHz; low-phase-noise oscillator; modified coupled method; multiphase oscillator; parallel-coupled quadrature VCO; self-injection-coupled technique; size 0.18 mum; standard CMOS technology; voltage 1.8 V; CMOS integrated circuits; Frequency measurement; Phase noise; Silicon carbide; Transistors; Voltage measurement; Voltage-controlled oscillators; CMOS; parallel-coupled quadrature voltage-controlled oscillator (QVCO) (P-QVCO); phase noise; self-injection-coupled (SIC) QVCO (SIC-QVCO);
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2012.2213364
