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Programmable Oscillators – Introduction

Programmable oscillators are becoming increasingly popular in many applications, from communications and robotics to industrial automation and medical instruments. Programmable oscillators can control a wide range of frequency, period and pulsewidths more precisely than conventional fixed crystal oscillators, in certain cases they can also provide a more cost effective solution than conventional oscillators. This article will focus on the SG-9101CB-D05PHBCC Programmable Oscillator in particular and discuss its application field and working principle.

Application Field of the SG-9101CB-D05PHBCC Programmable Oscillator

The SG-9101CB-D05PHBCC Programmable Oscillator is an Ultra Low Jitter oscillator designed for phase locked loop (PLL) and clock-data recovery (CDR) circuits used in LTE and 4G modem applications. It has an output frequency of 100MHz ±50ppm with an ultra low phase jitter of 95fs, providing the stability and accuracy needed for these advanced communication applications. It is ideal for base-stations and mobile devices, such as handsets and tablet PCs. Furthermore, it is pin and package compatible with many of the commonly available programmable oscillators and can be used as a cost-effective replacement in many applications.

Working Principle of the SG-9101CB-D05PHBCC Programmable Oscillator

The SG-9101CB-D05PHBCC Programmable Oscillator is a Phase Locked Loop (PLL) with Charge Pump. It provides high stability to its output frequency even in a wide range of temperature and high output current of 25mA. The programmable oscillator itself is composed of five main components – a voltage-controlled oscillator (VCO), a loop filter, a phase-frequency detector (PFD), a charge pump, and a reference oscillator.

The VCO is responsible for generating the oscillations within the PLL and is sensitive to voltage or current changes. The output frequency of the VCO is dependent on the settings that are applied to it. The loop filter acts to filter any rapid changes in the output of the PFD, thus it allows the system to “settle” into a stable point. The PFD compares the input and output frequencies of the loop and its output is then used to adjust the VCO settings according to the results of such comparison. The charge pump is responsible of increasing and decreasing the voltage of the VCO in order to adjust the output frequency of VCO. Finally, the reference oscillator is the stable reference frequency against which the VCO frequency must be compared.

Conclusion

The SG-9101CB-D05PHBCC Programmable Oscillator provides a robust and cost effective solution for advanced communications applications. Its application field is mainly communication and data-transfer systems, and its working principle is based on a Phase Locked Loop (PLL) with an integrated voltage-controlled oscillator, loop filter, phase-frequency detector and charge pump. This programmable oscillator integrates all these components into one package, making it ideal for both commercial and industrial applications.

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