NB2779ASNR2

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    Clock/Timing covers the infrastructure, components, and associated technologies in the electronics industry. It mainly covers the timing parameters and circuits which are used to generate and modify signals in order to accurately control digital systems, communications networks, and computer systems. Among all the types of clock/timing devices, NB2779ASNR2 is a new series of Clock Generator and Frequency Synthesizer which belongs to the high performance, low power consumption and low jitter. NB2779ASNR2 is highly integrated into one chip and is ideal for high frequency applications.

    NB2779ASNR2 can provide reference signal for semiconductor. The main application fields of NB2779ASNR2 are optical communication, base station communication and local area network. In these application fields, NB2779ASNR2 can provide crystal free, low power and low jitter reference signals for high frequency applications. It also can be used for fibre-to-the-home network synchronization network, Gigabit passive optical network (GPON) optical line terminators (OLT) and EPON optical line terminals (EPON).

    The working principle of NB2779ASNR2 is the use of phase locked loops (PLLs) to control the frequency of clock generator. The PLL is a technique used to generate a stable clock or an audio signal by synchronizing an input signal to a reference frequency. It can be combined with a few components like a voltage-controlled oscillator (VCO), frequency divider, phase/frequency detector and a low-pass filter to form a closed-loop system. Inside the NB2779ASNR2 chip,an exclusive phase-locked loop frequency synthesizer is applied. The frequency synthesizer can precisely track the phase of the frequency reference signal to ensure that it is always in phase with the reference signal.

    The NB2779ASNR2 chip combines a wideband voltage-controlled oscillator with differential output buffer and features a low phase noise and low jitter of 0.15ps RMS. It also contains a phase frequency detector, a feedback divider and an LC-based low-pass filter. Traditionally, a phase detector would compare the input signal phase with the phase from the oscillator and adjust the frequency of the oscillator according to the phase difference. NB2779ASNR2 uses a modified PLL architecture to implement the frequency synthesizing process. The phase/frequency detector in this PLL architecture has a wide frequency comparison range and provides a fast lock time. The extra advantage of NB2779ASNR2 is that it allows for programmable wideband tuning of the VCO frequency.

    In conclusion, NB2779ASNR2 is a high performance, low power consumption and low jitter clock generator and frequency synthesizer designed for high frequency applications. It is suitable for use in optical communication, base station communication and local area network applications. This chip is ideally suited for applications such as fibre-to-the-home network synchronization, GPON and EPON. The working principle of NB2779ASNR2 is based on the use of PLLs to track the reference frequency, and a modified PLL architecture is used to implement the frequency synthesizing process. This chip features a wideband tuning of VCO and low jitter of 0.15ps RMS, which make it highly competitive in the clock/timing market.

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