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This paper presents a 14-bit digitally controlled ring oscillator (DCO) with operating frequency up to 3.4 GHz in 0.18 µm CMOS technology. Digital control is employed to control the transistor operation to obtain higher voltage swing and lower flicker (1/f) noise that in turn results in the lowest phase noise in a ring oscillator. Furthermore, sub-feedback topology is used to obtain the stable quadrature...
Design and implementation of a CMOS multiphase 10b digitally controlled oscillator (DCO) in ring topology that employs fraction-based series to optimize the transistors size, are presented. One of the advantages of using fraction-based series is that it can reduce the power consumption compared to the binary series without any cost of tuning range and phase noise. The proposed DCO, which was implemented...
A 14-bit digitally controlled ring oscillator (DCO) with operating frequency up to 1 GHz in 0.18 µm CMOS technology is designed. The design used digital control to obtain higher output voltage swing and to get lower flicker noise compared to the analog counterpart. To make the oscillator oscillate and to get stable quadrature output in the even number of stages, feed-forward technique is used. Designed...
This paper presents a simple architecture for 8-bit digital controlled oscillator (DCO) on 3-stages ring topology in TSMC 0.18 um CMOS technology. A new schematic of tristate inverter is also proposed. The proposed tristate inverter has higher switching speed and low power consumption as compared to conventional one. The control digit changes the driving current that provides large tuning range from...
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