Title :
A low power current reused quadrature VCO for biomedical applications
Author :
Khan, T. ; Raahemifar, K.
Author_Institution :
Dept. of Electr. & Comput. Eng., Ryerson Univ., Toronto, ON, Canada
Abstract :
This paper presents a low power current reusing quadrature voltage controlled oscillator for use in implantable electronics operating in the 402 MHz to 405 MHz medical implant communication service (MICS) frequency band. The oscillator was designed in IBM CMOS8RF 0.13 mum CMOS technology and simulated using Cadence IC5.141. The current reuse structure draws half the bias current as a conventional quadrature voltage controlled oscillator while exhibiting performance comparable to or exceeding that of previously published designs. Simulation results show that the oscillator phase noise is -127 dBc/Hz and consumes 1 mW of power from a 1 V supply. When the supply voltage is scaled to 0.65 V and biased for the same current consumption, the power consumption is reduced to 650 muW with phase noise of -111 dBc/Hz, which is almost 50% less power consumption when compared to oscillators in the same frequency band. The tuning range of the oscillator is 401.25 MHz to 407.5 MHz, enough to cover the MICS frequency band.
Keywords :
CMOS integrated circuits; UHF integrated circuits; UHF oscillators; biomedical electronics; low-power electronics; phase noise; prosthetics; voltage-controlled oscillators; Cadence IC5.141; IBM CMOS8RF CMOS technology; MICS frequency band; biomedical applications; frequency 401.25 MHz to 407.5 MHz; frequency 402 MHz to 405 MHz; implantable electronics; low power current reusing quadrature voltage controlled oscillator; medical implant communication service; oscillator phase noise; power 1 mW; power consumption reduction; size 0.13 mum; voltage 0.65 V; voltage 1 V; CMOS technology; Energy consumption; Implants; Medical diagnostic imaging; Microwave integrated circuits; Phase noise; Radio frequency; Radio spectrum management; Transceivers; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2009. ISCAS 2009. IEEE International Symposium on
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-3827-3
Electronic_ISBN :
978-1-4244-3828-0
DOI :
10.1109/ISCAS.2009.5117837