Title :
Experimental Evaluation of Phase-Noise and Quadrature Error in a CMOS 2.4 GHz Relaxation Oscillator
Author :
Oliveira, Luis B. ; Fernandes, Jorge R. ; Silva, Manuel M. ; Filanovsky, I.M. ; Verhoeven, C.J.M.
Author_Institution :
I.S.Tecnico, INESC-ID, Lisboa
Abstract :
Contrary to what happens with LC oscillators, the increase of coupling in cross-coupled relaxation RC-oscillators leads to a lower quadrature error and lower phase-noise. We present a 2.4 GHz CMOS quadrature relaxation oscillator, and show the measurements confirming this property. Increasing the coupling block gain, the oscillator phase-noise is reduced from -97 dBc/Hz to -104 dBc/Hz @ 1 MHz. The quadrature error is reduced from 4.3deg to 0.8deg. These results show that RC quadrature oscillators may be a practical alternative for RF transceiver applications.
Keywords :
CMOS integrated circuits; UHF oscillators; phase noise; relaxation oscillators; 1 MHz; 2.4 GHz; CMOS; LC oscillators; RF transceiver; cross-coupled relaxation RC-oscillators; phase-noise; quadrature error; Capacitors; Image converters; Integrated circuit noise; Oscillators; Radio control; Radio frequency; Transceivers; Trigger circuits; Virtual colonoscopy; Voltage;
Conference_Titel :
Circuits and Systems, 2007. ISCAS 2007. IEEE International Symposium on
Conference_Location :
New Orleans, LA
Print_ISBN :
1-4244-0920-9
Electronic_ISBN :
1-4244-0921-7
DOI :
10.1109/ISCAS.2007.378578
