Introduction

Oscillators are electronic circuits used to generate electrical signals at a distinct frequency or frequency range. Types of oscillators include voltage-controlled oscillators (VCOs), crystal oscillators, phase-locked loops (PLLs) and temperature-compensated crystal oscillators (TCXOs). Each type of oscillator is used in a variety of applications and can be implemented in different combinations. In this article, we will focus specifically on SIT8208AI-3F-18S-26.000000T oscillator, its application field and working principle.

SIT8208AI-3F-18S-26.000000T Oscillator

The SIT8208AI-3F-18S-26.000000T oscillator belongs to the SIT8200 family of voltage controlled crystal oscillators (VCXOs). The SIT8200 series provides extremely low jitter performance while maintaining excellent current savings by optimizing the combination of phase-lock loop (PLL) and digital with its analog architecture. This oscillator is specifically designed to provide extremely low additive jitter below 5 ps, making it an ideal candidate for high-frequency, sensitive components.

Application Field

The SIT8208AI-3F-18S-26.000000T oscillator has applications in a variety of high-speed high-frequency fields such as Ethernet, 10Gigabit Ethernet, optical transceivers, symbol synchronization and signal processing for fiber optics. Its low jitter performance makes it ideally suited for components requiring precise timing such as digital logic, counters, timing exchanges and serial communication interfaces.

More specifically, this oscillator is well-suited for use in cellular infrastructures requiring precision timing, such as base stations and macrocells, as it is designed for use in a wide range of frequencies between 0.5GHz and 2.6GHz for critical applications. It has been certified to provide reliable operation for a variety of purposes, including the deployment of 5G infrastructure. Additionally, it can be used to provide precise and reliable time frequency reference for IEEE 1588 networks, providing a distributed clock source for telecom applications.

Working Principle

The SIT8208AI-3F-18S-26.000000T oscillator works by using a voltage controlled oscillator (VCO) and voltage controlled crystal oscillator (VCXO). This combination allows it to generate a stable, precise, and low jitter signal under control of a digital signal processor (DSP).

The VCO is the heart of the oscillator. It is comprised of a tunable tank circuit and buffer amplifier. The tank circuit consists of resistors, capacitors, and an inductor, which creates a resonant circuit that produces an oscillating voltage. The buffer amplifier amplifies this voltage to a level that is suitable for driving other circuits.

The VCXO works in conjunction with the VCO by providing a crystal-controlled reference signal. This reference signal is used as a reference point by the oscillator and helps to ensure that the generated signal is stable and low in jitter. In order to maintain stable and precise oscillations, the VCO\'s tuning voltage must be constantly monitored and adjusted.

The oscillator\'s DSP monitors and adjusts the tuning voltage to ensure stable and low jitter output. The DSP also measures phase noise, which helps to ensure that the signal is within accurate range and phase. Lastly, the DSP is responsible for monitoring temperature and providing temperature compensation in order to maintain accuracy.

Conclusion

In conclusion, the SIT8208AI-3F-18S-26.000000T oscillator is an extremely reliable and accurate oscillator designed to generate low jitter signals for high-speed and high-frequency applications. It is well-suited for components requiring precise timing, such as digital logic, counters, timing exchanges, and serial communication interfaces. It is also ideal for deployment in 5G infrastructure, as it is certified to provide reliable operation. By combining a VCO and VCXO with a digital signal processor, the SIT8208AI-3F-18S-26.000000T is able to generate an extremely stable and low-jitter signal.