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- W2110153318 abstract "Ring oscillators are the traditional on-chip clock source for RSFQ mixed-signal and digital circuits. Their long-term frequency stability is essential for certain signal processing applications such as the sampling clock for an A/D converter or the output clock of a D/A converter. However conventional bias schemes lead to excessive drift in the frequency. Embedding the ring oscillator in a phase-locked loop (PLL) circuit allows it to inherit the frequency stability of an external reference source. An RSFQ circuit comprised of a ring oscillator, a divide-by-220 prescaler and a resynchronizer D flip-flop was fabricated using the standard 1 kA cm-2 niobium foundry service from Hypres. The circuit was stabilized using a low-frequency PLL with a bandwidth of 6 Hz. The output of the phase detector in the PLL was used to produce a feedback current that stabilized the frequency of the ring oscillator at around 8 GHz. The frequency spectrum of the RSFQ scaled oscillator output was measured in open- and closed-loop configurations. Compared to the open-loop phase noise spectrum the closed-loop spectrum showed a decrease of 30 dB of the oscillator phase noise at an offset of 1 Hz from the divided-down carrier frequency of 4.1 kHz. This agreed with the classical phase-locked loop model for the system. The long-term frequency drift of the RSFQ clock was determined by the stability of the oven-controlled quartz oscillator used as the reference in the PLL." @default.
- W2110153318 created "2016-06-24" @default.
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- W2110153318 date "1999-11-01" @default.
- W2110153318 modified "2023-09-25" @default.
- W2110153318 title "Phase-locked operation of RSFQ ring oscillators" @default.
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- W2110153318 doi "https://doi.org/10.1088/0953-2048/12/11/329" @default.
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