Oscillators

In electronics, oscillators are circuits that generate periodic electrical signals with a variety of wave shapes. Oscillators play an important role in modern telecommunications and consumer electronics, as they are used for various tasks such as frequency synthesizers, clock circuits, signal generators, signal processing circuitry, and various other applications.

The 637L18436C3T oscillator is a high performance, low power, dual-mode voltage-controlled oscillator (VCO) from Avago Technologies. It is used in a variety of applications where low frequency radio noise might be present, such as mobile phones, mobile radio networks, and wireless audio systems. The 637L18436C3T oscillator is capable of providing highly accurate, low frequency stability with ultra-low power consumption. It is designed to generate two independent outputs that are based on a Common Clock VCO (CCVCO) architecture which allows for flexible programmability.

Application Field of 637L18436C3T Oscillator

The 637L18436C3T oscillator is designed for use in modern communication systems. It is optimised to meet the growing need for increasing frequencies and capacitive loads in wireless communication systems. It can be used in cellular base stations, Wi-Fi/Bluetooth transceivers, satellite television, radar systems, and other high-speed, low-power applications.

The 637L18436C3T oscillator is well suited for use in applications where low-noise operation and high signal quality is important. It is also suitable for automotive, military, and industrial applications due to its low power design and robust performance. The oscillator provides a wide tuning range that supports frequencies up to 2.5GHz.

Working Principle of 637L18436C3T Oscillator

The 637L18436C3T oscillator is based on the common clock VCO architecture that allows for flexible programming options. The oscillator’s signal path contains a charge pump, loop filter, voltage-controlled oscillator, current-controlled oscillator, and one or two phase-locked loops. The loop filter contains elements such as resistor, capacitor, and inductor which determine the oscillator’s frequency and stability of the signal.

The 637L18436C3T oscillator has an output amplitude stabilization loop which ensures the waveform stability over temperature and supply voltage fluctuations. The current-controlled oscillator is connected to a digital input, which allows for programming of the oscillator’s output frequency in an integer division ratio. This allows for a wide tuning range of frequencies with an accuracy of up to 0.1%.

In addition, the 637L18436C3T oscillator has a voltage-controlled baseband generator that enables a wide range of modulation techniques. The temperature-compensated auto-calibration feature ensures that the oscillator is optimally tuned over extended temperature and supply voltage conditions.

Conclusion

The 637L18436C3T oscillator from Avago Technologies is a high-performance, low-power voltage-controlled oscillator designed for modern communication systems. It features an intuitive CCVCO architecture that provides flexibility for programming. The oscillator offers a wide range of frequencies with high accuracy and low phase noise. It is suitable for applications where low-noise operation and signal quality are important, such as mobile phones, mobile radio networks, and wireless audio systems.