SIT8008AI-7-18E

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Programmable Oscillators play an important role in a variety of applications, from signal conditioning and signal processing in communications systems to clock generation in programmable logic controllers. One of the most popular programmable oscillators on the market is the SIT8008AI-7-18E, a Voltage Controlled Oscillator (VCO) featuring frequency stability over temperature, wide frequency range starting at 5kHz and rising to beyond 40MHz, moderate power consumption and excellent phase noise performance. In this article, we will look at the typical application field and working principle of the SIT8008AI-7-18E oscillator.

Application Field

Thanks to its wide frequency range and excellent phase noise performance, the SIT8008AI-7-18E is an ideal choice for many applications. These include:

• Wireless telecommunication systems: Mobile base station, remote radio access points, mobile hotspots
• GPS applications: Timing, navigation, location-based services and remote monitoring
• Industrial applications: Variable speed drives, position and speed control
• Medical equipment: Ultrasonic imaging, diathermy
• Avionics applications: Navigation, communication and flight control

Working Principle

The SIT8008AI-7-18E is a monolithic Voltage Controlled Oscillator (VCO) that generates a sinusoidal output over a wide frequency range. The oscillator combines an inverting amplifier, output filter and sine wave generator in a single package. The VCO generates an output frequency, which is determined by an external control voltage. An input voltage of 0.1V corresponds to a frequency of 5kHz and an input voltage of 0.4V corresponds to a frequency of 40MHz. The output frequency is defined by the following formula:

F(output) = F(min) × e^{V(control)/V_t}

where F(min) is the minimum output frequency and V_t is the threshold voltage.

The control voltage V(control) is supplied to the VCO input and is varied to set the desired frequency. The control voltage is also referred to as the tuning voltage. The voltage is internally filtered to minimize noise and spurious signals. The frequency can be changed over a wide range with little tuning distortion. The VCO also includes a number of safety features such as a temperature controlled bias circuit, output limiter and voltage lock detector. These features are designed to prevent the VCO from being damaged or operating in an unstable state.

Conclusion

The SIT8008AI-7-18E Voltage Controlled Oscillator is an excellent choice for a variety of applications from wireless telecommunication systems to medical equipment. With its wide frequency range, excellent phase noise performance, moderate power consumption and features such as temperature controlled bias circuit and output limiter, the SIT8008AI-7-18E is a reliable and robust VCO. The working principle behind this oscillator is straightforward and easy to understand. By understanding the working principle of the SIT8008AI-7-18E, engineers can easily design and implement the oscillator into the most demanding applications.

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