Title :
A low phase-noise class-C VCO using novel 8-shaped transformer
Author :
Ping-Yi Wang ; Te-Lin Wu ; Ming-Yu Chen ; Yun-Chun Shen ; Yin-Cheng Chang ; Da-Chiang Chang ; Hsu, Shawn S. H.
Author_Institution :
Inst. of Electron. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
Abstract :
A 9 GHz low phase noise class-C voltage controlled oscillator (VCOs) with an 8-shaped transformer configuration using 0.18-μm CMOS technology is presented. By utilizing the 8-shaped transformer, the proposed class-C VCO can be operated at reduced dc power consumption while maintaining circuit performance in terms of phase noise and limiting EMC (Electro-Magnetic Compatibility) issues when the symmetrical structures are considered. Consuming a dc current of 5.5 mA with the supply voltage of 1.8 V, the class-C VCO exhibits a frequency tuning range of 1.4 GHz, a phase noise of -117.4 dBc/Hz at 1 MHz offset frequency away from the 8.94 GHz carrier, and a figure of merit up to 186.4 dBc/Hz.
Keywords :
CMOS integrated circuits; electromagnetic compatibility; phase noise; transformers; voltage-controlled oscillators; CMOS technology; EMC; current 5.5 mA; electromagnetic compatibility; frequency 1 MHz; frequency 1.4 GHz; frequency 8.94 GHz; frequency 9 GHz; low phase noise class-C VCO; size 0.18 mum; transformer; voltage 1.8 V; voltage controlled oscillator; Circuit faults; Frequency measurement; Inductors; Phase noise; Tuning; Voltage-controlled oscillators; 8-shaped transformer; class-C VCO; voltage controlled oscillators (VCOs);
Conference_Titel :
Circuits and Systems (ISCAS), 2015 IEEE International Symposium on
Conference_Location :
Lisbon
DOI :
10.1109/ISCAS.2015.7168776
