637L156H6C3T

Oscillators are electrical components used in many applications to produce a periodic signal or wave. Among the most recognized oscillators are frequency generators, voltage-controlled oscillators (VCOs) and phase-locked loops (PLLs). 637L156H6C3T, or Frequency Jittering Oscillator, is an oscillator designed for use in applications where frequency jitter, phase jitter and spectral purity are critical design parameters. It is an optimized solution for high volume applications such as networking equipment, telecom and fiber networks, wireless communication, audio and video equipment, base station controllers and more.

Application Field

The 637L156H6C3T is a frequency jittering oscillator designed for a wide range of applications where frequency jitter, phase jitter and spectral purity are important. This device is used in many different industries including communications, aerospace, defense, telecommunications, industrial, audio/video, automotive, medical, consumer and instrumentation. In these fields, performance, reliability and accuracy of the oscillator are essential.

The 637L156H6C3T is used in many applications where ultra-low phase noise, high accuracy and reliability are required. The most common uses include:

• High purity (ultra-low jitter) frequency synthesisers
• High precision frequency sources
• Test and measurement instrumentation
• Communication systems
• Programmable frequency dividers
• Phase locked loops
• Wireless communication systems
• Satellite navigation systems

Working Principle

The 637L156H6C3T is a frequency jittering oscillator that uses a combination of voltage-controlled oscillators (VCOs) to achieve extremely low phase noise performance, high accuracy and reliability. The oscillator is designed to be able to operate from 20kHz to 10MHz with a wide variety of control input signals, including sinusoidal, triangular and square waves. It consists of two identical VCOs connected in a differential configuration, with one VCO producing an output frequency that is a fixed amount higher than the other. The output frequencies are then mixed together to produce a frequency-jittered signal.

The frequency of the signal is determined by the control input signal, which can be either a continuous wave (CW) signal or a pulse-width modulation (PWM) signal. The CW signal controls the overall frequency, while the PWM signal allows for finer frequency adjustment. The output frequency is also influenced by the internal switching rate of the oscillator, which is set by an external resistor. The internal switching rate affects the frequency jitter, which is the difference between the higher and lower VCO output frequencies.

The oscillator is voltage-controlled, so the control input signal must be a voltage that is proportional to the desired output frequency. Additionally, the 637L156H6C3T is capable of operating in an open-loop or closed-loop operation mode. In an open-loop configuration, the output frequency is determined solely by the control input signal, while in a closed-loop configuration, the output frequency is adjusted to maintain a constant frequency difference between the two VCOs. This ensures that the overall output frequency remains stable.

Conclusion

The 637L156H6C3T is an optimized oscillator designed for applications where ultra-low phase noise, high accuracy and reliability are required. The device is capable of producing a frequency-jittered signal with a wide range of control input signals. It is used in many industries, including communications, aerospace, defense, telecommunications, industrial, audio/video, automotive, medical, consumer and instrumentation. The 637L156H6C3T is an ideal solution for high volume applications where an oscillator with excellent performance is needed.