Title :
The design and simulation of an optimized MEMS varactor with high q factor for RF circuits
Author :
Rahimi, M. ; Jamuar, S.S. ; Hamidon, M.N. ; Ahmad, M.R. ; Mousavi, S.A.
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. Putra Malaysia, Serdang
Abstract :
This research concerns on design of high-performance MEMS tuning variable varactor. Varactors can be used as a part of LC-tank of an oscillator. Using MEMS technology causes an improvement in Q factor of varactor to achieve less phase noise and lower power consumption in an oscillator. In this work a two different gap varactor has been used to avoid the pull-in voltage at 2.4 GHz. The expected capacitance is 3 pF. The area and the gaps between the plates achieved based on a basic formula of the capacitor. The design of layout has been done by CoventorWare software 2006. The DC voltage is 2.5 V which is applied to the plates and the results of 3.02 pF could be gained after analyzing. The Q factor of varactor calculated based on a distributed RC line and computed about 376.43 using MATLAB programming. The result is good enough to make low phase noise in VCO.
Keywords :
Q-factor; UHF devices; circuit tuning; micromechanical devices; phase noise; varactors; voltage-controlled oscillators; CoventorWare software 2006; MATLAB programming; MEMS varactor design; Q factor; RF circuits; VCO; capacitance 3 pF; capacitance 3.02 pF; capacitor plates; distributed RC line; frequency 2.4 GHz; oscillator LC-tank circuits; phase noise; power consumption; tuning variable varactor simulation; voltage 2.5 V; voltage-controlled oscillators; Circuit optimization; Circuit simulation; Design optimization; Micromechanical devices; Oscillators; Phase noise; Q factor; Radio frequency; Varactors; Voltage;
Conference_Titel :
Semiconductor Electronics, 2008. ICSE 2008. IEEE International Conference on
Conference_Location :
Johor Bahru
Print_ISBN :
978-1-4244-3873-0
Electronic_ISBN :
978-1-4244-2561-7
DOI :
10.1109/SMELEC.2008.4770299
