Development of 13 bit digitally controlled oscillator using fibonacci sequence in 0.18 um CMOS process.

This paper presents a digitally controlled oscillator (DCO) in Inductor-Capacitor (LC) topology with an enhanced frequency-steps and power consumption. Using special Fibonacci sequence method for optimizing capacitor sizes, this digitally-controlled oscillator (DCO) realizes frequency-tuning steps superior than a conventional DCO using binary sequence without increasing the power consumption. The proposed circuit is implemented in 0.18 um CMOS technology and tested. It has a center frequency of 7.9 GHz. The measured phase noise is −117.1 dBc/Hz(@1MHz offset) at carrier frequency of 7.7 GHz. [ABSTRACT FROM PUBLISHER]