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RTWO is a transmission line based technology for generation of near square or sine wave signals with multiple phases. Without a startup circuit for control of propagation, the direction of traveling wave is mostly nondeterministic. The direction is defined by the least resistance path of the transmission line. Startup circuits have been demonstrated to work for low frequencies of operation. The drawback...
The design of Rotary Traveling Wave Oscillator (RTWO) requires the optimization of phase noise, power and frequency tuning range. RTWO design is a multi-parameter multi-objective problem which requires simultaneous optimization of performance measures. In this paper we apply neural network modeling and genetic algorithm to obtain optimal values of design parameters for low power consumption and phase...
In this work, the design and implementation of a 70 GHz Rotary Traveling Wave Oscillator (RTWO) is reported. The gain stage of the oscillator is implemented using a cross-coupled NMOS-PMOS pair instead of the conventional cross-coupled all NMOS or inverter pair. The circuit is fabricated in a standard 65 nm CMOS process with an occupied chip area of 0.95 × 0.6 mm2. Power consumption and output power...
RTWO represents a transmission line based technology for clock generation providing low skew, low phase noise and multiphase signal. Compared to traditional LC oscillators, one major drawback in RTWO performance is high power consumption. To minimize power consumption, a half circuit implementation of gain stage is proposed. The concept is validated by X-band RTWOs using conventional and proposed...
An analysis of the behavior of coupled lines in the 100–200 GHz f requenc y range i s pre s ent ed. Characterization of lumped and electromagnetic elements are included as a preliminary work to predict the behavior of the line in a Rotary Traveling Wave Oscillator (RTWO) integrated circuit. Using Sonnet and Agilent ADS, the simulated behavior of a coupled transmission line implemented in 65 nanometer...
A novel rotary traveling wave oscillator (RTWO) is proposed to be an alternative architecture to generate THz signals for long distance high speed communication. As a preliminary work, the design of 110–152 GHz RTWO as the fundamental oscillators is reported in this paper. The transmission line ring, the n-transistor-only cross-coupled inverter pair (CCIP), and the bias-T for the oscillation have...
In this work, an explanation for the frequency limiting factor through analysis and board level implementation of Rotary Traveling Wave Oscillator (RTWO) is proposed. We also established and demonstrate the relation between frequency limit and the amplification stage. To utilize RTWO for high frequency application, it was realized that, varying the ring size to achieve high frequency signals is governed...
Rotary travelling wave oscillator (RTWO) represents a transmission line based technology for multigigahertz clock generation. RTWO design is a multi-parameter-multi-objective problem with tradeoffs of performance measures, power and phase noise. In this paper, non-dominated based genetic algorithm for multi-objective optimization is used to determine the Pareto optimal front of solutions for low power...
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