Title :
A high frequency resolution digitally controlled oscillator with differential tapped inductor
Author :
Fan Yang ; Runhua Wang ; Xiaozhe Liu ; Junhua Liu ; Huailin Liao
Author_Institution :
Key Lab. of Microelectron. Devices & Circuits (MOE), Peking Univ., Beijing, China
Abstract :
A novel architecture of high frequency resolution LC-tank based digitally controlled oscillator (DCO) is presented in this paper. The proposed architecture utilizes a differential tapped inductor and a capacitor array within the taps for fine frequency tuning. A prototype of 1.6 GHz DCO integrated in 0.18-μm CMOS technology exhibits a tuning range of 40.2% and a phase noise of -123.6 dBc/Hz@1MHz. With a minimal capacitance step of 7.5 fF, the frequency resolution is improved to 7.6 kHz/LSB. The DCO dissipates 3.2 mA from a 1.8 V supply and occupies an area of 0.46 mm2.
Keywords :
CMOS integrated circuits; LC circuits; MMIC oscillators; UHF oscillators; circuit tuning; field effect MMIC; CMOS technology; DCO; LC-tank oscillator; capacitor array; current 3.2 mA; differential tapped inductor; digitally controlled oscillator; fine frequency tuning; frequency 1.6 GHz; high frequency resolution oscillator; size 0.18 mum; voltage 1.8 V; Arrays; Capacitance; Capacitors; Inductors; Phase noise; Tuning; Digitally Controlled Oscillator (DCO); differential tapped inductor; high frequency resolution;
Conference_Titel :
Circuits and Systems (ISCAS), 2015 IEEE International Symposium on
Conference_Location :
Lisbon
DOI :
10.1109/ISCAS.2015.7168596
