Title :
Low phase noise 18 kHz frequency tuning step 5 GHz DCO using tiny capacitors based on transmissi on lines
Author :
Pokharel, R.K. ; Uchida, K. ; Tomar, A. ; Kanaya, H. ; Yoshida, K.
Author_Institution :
Grad. Sch. of Inf. Sci. & Electr. Eng., Kyushu Univ., Fukuoka, Japan
Abstract :
We proposed a method to realize the fine frequency-tuning step using tiny capacitors instead of MIM capacitors for a digitally controlled oscillator (DCO). The tiny capacitors are realized by the coplanar transmission lines in a 6 metal layers (M6) foundry of 0.18 um CMOS technology. These transmission line based capacitors are designed by using electro-magnetic field simulator, and co-designed by using SPICE simulator. Finally, we fabricated the proposed DCO in 0.18 um CMOS technology, and tested. The measured phase noise of DCO was -118.3 dBc/Hz (@1MHz offset frequency), and the oscillating frequency tuned from 4.86 GHz to 5.36 GHz in the minimum frequency-tuning step of 18 kHz.
Keywords :
CMOS integrated circuits; MMIC oscillators; capacitors; circuit simulation; coplanar transmission lines; electronic engineering computing; field effect MMIC; CMOS technology; DCO; SPICE simulator; coplanar transmission lines; digitally controlled oscillator; electromagnetic field simulator; frequency 18 kHz; frequency 4.86 GHz to 5.36 GHz; frequency tuning; low phase noise; size 0.18 mum; tiny capacitors; transmission line based capacitors; CMOS technology; Coplanar transmission lines; Digital control; Foundries; Frequency; MIM capacitors; Oscillators; Phase noise; SPICE; Tuning; 0.18 UM CMOS; DIGITALLY-CONTROLLED OSCILLATOR; FINE TUNING STEP;
Conference_Titel :
Silicon Monolithic Integrated Circuits in RF Systems (SiRF), 2010 Topical Meeting on
Conference_Location :
New Orleans, LA
Print_ISBN :
978-1-4244-5456-3
DOI :
10.1109/SMIC.2010.5422841
