Title :
Optimization of the Phase Noise of LC VCO in UHF RFID Reader
Author :
He, Wei ; Xu, Ping ; Lai, Zongsheng
Author_Institution :
Inst. of Microelectron. Circuit & Syst., East China Normal Univ., Shanghai, China
Abstract :
A low phase noise LC voltage controlled oscillator for UHF radio frequency identification reader is presented in this paper. Symmetrical LC resonators and a low-dropout-regulator are used to suppress the noise from tail current and power supply, respectively. 3-bit switched-capacitor array for coarse tuning followed by MOS varactors for fine tuning to ensure a Low voltage controlled oscillator gain (<48 MHz/V). The circuit is implemented in IBM 0.18 mum CMOS process, and the measured phase noise is -136.25 dBc/Hz at 1 MHz offset from the carrier while drawing 4.5 mA from a 3.3 V supply.
Keywords :
CMOS integrated circuits; radiofrequency identification; voltage-controlled oscillators; CMOS process; LC VCO; MOS varactors; UHF RFID reader; UHF radio frequency identification reader; current 4.5 mA; frequency 1 MHz; low phase noise LC voltage controlled oscillator; low-dropout-regulator; size 0.18 mum; symmetrical LC resonators; voltage 3.3 V; Circuit noise; Circuit optimization; Current supplies; Phase noise; Phased arrays; Power supplies; Radiofrequency identification; Switching circuits; Tail; Voltage-controlled oscillators;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing, 2009. WiCom '09. 5th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-3692-7
Electronic_ISBN :
978-1-4244-3693-4
DOI :
10.1109/WICOM.2009.5301279
