Title :
A highly stable CMOS Self-Compensated Oscillator (SCO) based on an LC tank temperature Null concept
Author :
Ahmed, A. ; Hanafi, B. ; Hosny, S. ; Sinoussi, N. ; Hamed, A. ; Samir, M. ; Essam, M. ; El-Kholy, A. ; Weheiba, M. ; Helmy, A.
Author_Institution :
Timing Products Div., Si-Ware Syst., Cairo, Egypt
Abstract :
A highly stable all silicon Self-Compensated Oscillator (SCO) reference source is presented. Self compensation across temperature is achieved using a newly discovered phenomenon in LC-tanks named the Temperature Null (TNULL) which has been described and briefly analyzed. A quadrature oscillator architecture has been used to implement the SCO in a 0.18μm CMOS technology. The SCO has on-chip infrastructure facilitating low cost trimming and frequency calibration at room temperature. Excellent frequency stability of ±50ppm has been measured across temperature (0 - 70°C), 3.0 - 3.6V supply and 1 - 15pF load. The SCO has a programmable frequency range of 1 - 133MHz, consumes 7.1mA at 25MHz and has an RMS period jitter of 2ps at 125MHz.
Keywords :
CMOS analogue integrated circuits; VHF oscillators; frequency stability; CMOS self compensated oscillator; LC tank temperature null concept; capacitance 1 pF to 15 pF; current 7.1 mA; frequency stability; programmable frequency; quadrature oscillator; size 0.18 mum; temperature 0 C to 70 C; voltage 3 V to 3.6 V; CMOS integrated circuits; Frequency measurement; Oscillators; Stability analysis; Temperature measurement; Temperature sensors; Thermal stability;
Conference_Titel :
Frequency Control and the European Frequency and Time Forum (FCS), 2011 Joint Conference of the IEEE International
Conference_Location :
San Fransisco, CA
Print_ISBN :
978-1-61284-111-3
DOI :
10.1109/FCS.2011.5977850
