Start-up analysis for differential ring oscillator with even number of stages

Zhang, Hui; Yang, Haigang; Liu, Fei; Yuanfeng, Wei; Zhang, Jia

doi:10.1109/apccas.2010.5774827

Cited by 9 publications

(1 citation statement)

References 4 publications

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“…Here, ω 0 indicates the angular frequency of the oscillator when the loop is completely closed and the conditions in (1) are satisfied. While the odd number of stage configuration always satisfies the oscillation condition [19], for an even number of stages, the loop establishes positive feedback rather than a negative one, which may result in latch-up [20]. Cross-coupled (and properly sized) latches can be attached between differential nodes to prevent latch-up as shown in Fig.…”

Section: A Oscillation Conditionmentioning

confidence: 99%

An Automated Design Methodology for Ring Voltage-Controlled Oscillators in Nanometer CMOS Technologies

et al. 2023

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This paper presents a design automation methodology for ring voltage-controlled oscillators (RVCOs) with their realistic and physical characteristics captured. With multiple sets of input constraints such as target frequency, phase noise, and control voltage range, the proposed algorithm automatically finds the design candidates that satisfy the target constraints, by running iterative post-layout simulations with auto-generated layouts and testbenches. The number of post-layout simulations is significantly reduced by the backtracking algorithm that observes the simulation results and determines the search direction. The proposed algorithm is applied to generate RVCOs in 40-nm planar and 7-nm FinFET technologies for DDR5 applications, and it turns out the proposed methodology produces sets of design parameters that meet the target specification in multiple technologies.

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Section: A Oscillation Conditionmentioning

confidence: 99%