Title :
A Process and Temperature Compensated Two-Stage Ring Oscillator
Author :
Lakshmikumar, K.R. ; Mukundagiri, V. ; Gierkink, S.L.J.
Author_Institution :
Conexant Syst., Red Bank
Abstract :
Local positive feedback in a delay element enables a ring oscillator with only two stages to oscillate and produce quadrature clocks. Routh-Hurwitz´s criterion is applied to prove that such a structure can oscillate. An internally generated power supply from a constant-gm bias keeps the free running frequency to within plusmn 5% from -40 to 125degC over process variations. The 1.25 GHz oscillator in 0.13 mum CMOS draws 3.4 mA and has a phase noise of -88 dBc/Hz at 1MHz offset.
Keywords :
UHF oscillators; circuit feedback; compensation; low-power electronics; synchronisation; current 3.4 mA; delay element; frequency 1.25 GHz; local positive feedback; quadrature clocks; size 0.13 mum; temperature -40 C to 125 C; temperature compensation; two-stage ring oscillator; Circuits; Clocks; Delay; Frequency; Latches; Phase locked loops; Ring oscillators; Temperature; Transfer functions; Tuning;
Conference_Titel :
Custom Integrated Circuits Conference, 2007. CICC '07. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-1623-3
Electronic_ISBN :
978-1-4244-1623-3
DOI :
10.1109/CICC.2007.4405826
