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LOW JITTER DIGITAL PHASE LOCK LOOP WITH A NUMERICALLY-CONTROLLED BULK ACOUSTIC WAVE OSCILLATOR
LOW JITTER DIGITAL PHASE LOCK LOOP WITH A NUMERICALLY-CONTROLLED BULK ACOUSTIC WAVE OSCILLATOR
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机译：具有数字控制的体声波振荡器的低抖动数字相位锁相环
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摘要
A digital phase-locked loop (DPLL) includes a time-to-digital converter (TDC) having a first clock input, a second clock input, and a TDC output. The DPLL includes a digital loop filter (DLF). The DLF output controls a numerically-controlled bulk acoustic wave oscillator (NCBO). The NCBO output is divided down a fractional-N divider and is fed back to the TDC. The NCBO includes a reference oscillator, a phase and/or frequency detector, a charge pump, a loop filter, a voltage-controlled bulk acoustic wave oscillator (VCBO) and a feedback fractional-N divider that has a numerical control input, which is controlled by DLF output of DPLL. The NCBO forms a stable feedback loop and have a loop bandwidth much wider than DPLL loop bandwidth. In steady state, the NCBO output frequency can be linearly numerically adjusted. An auxiliary PLL or a fractional output divider can be used to generate additional needed frequencies.
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