The performance of analogue phase-locked loops (PLLs) has steadily improved with operating frequencies extending to 8GHz and beyond. Recently, digital PLLs based on direct digital synthesis (DDS) have ...

At the heart of a clocking device is the phased-locked loop (PLL). A key part of the PLL is the loop filter, which converts correction currents from the PLL charge pump into a control voltage for the ...

Digital PLLs outperform analog PLLs in jitter, phase noise, power, and die area. They also reduce migration risk and cost. They make integration and production test easy. Yet, they have not been ...

Phase-locked-loop (PLL) frequency synthesizers are signal sources often employed in many types of electronic equipment. They show up as clock sources in high-frequency instruments and as local ...

Clock signals provide reference timing to every integrated circuit and electrical system. While consumer applications typically use simple quartz crystals for reference-clock generation, other ...

同チャージ・ポンプは、既存のPLLチャージ・ポンプの中でも高電圧で、高いチューニング電圧の外付けVCOを直接駆動することが可能なため、アクティブ・ループ・フィルタが不要になり、システム設計の簡素化、性能の改善、部材費の低減などが可能となる。

One of the most challenging tasks in analog circuit design is to adapt a functional block to ever new CMOS process technology. For digital circuits the number of gates per square mm approx. doubles ...

In designing a simple spectroscopy setup, we needed to synchronize the speed of a small, inexpensive dc motor precisely to 6000 rpm (100 Hz). Our first idea was to take a phase-frequency detector type ...

Abstract: In this paper, a novel fractional-order charge-pump-phase-locked-loop (FO-CPPLL) using a fractional-order loop filter (FO-LF) is proposed to improve the overall system performance. The ...