CVCO55CC-2400-2400

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Introduction to VCOs

Voltage controlled oscillators (VCOs) are circuit designs that use an input voltage to adjust the frequency of output signal. They are widely used in various electronic applications and play a pivotal role in signal processing. A voltage-controlled oscillator (VCO) is an electronic, voltage-controlled oscillator designed around a tuned circuit consisting of an inductor and a capacitor. By varying the bias voltage of the oscillator, the frequency of the signal can be precisely controlled.

CVCO55CC-2400-2400 Applications and Working Principle

The CVCO55CC-2400-2400 is a low-cost, phase-locked loop voltage-controlled oscillator (PLVCO) that delivers an output signal of 2400 MHz over an operating temperature range of -40° to 85°C. It has a center frequency of 2400 MHz and an operating voltage range of 3.1 V to 3.6 V. Set by on-chip trim pads, the control voltage adjusts the frequency between 2200 MHz and 2600 MHz. The CVCO55CC-2400-2400 possesses a fast switching time of just 0.1 μs, making it ideal for applications such as data communications and wireless LAN systems. In addition, its small footprint and low-power consumption make it ideal for hand-held devices.

The CVCO55CC-2400-2400 uses a wide-range voltage-controlled oscillator (VCXO) that is designed to stay within 1 ppm (part per million) of its original frequency over the course of its life. The VCXO has an accuracy of 0.5 ppm, a tuning range of 0.25% of the center frequency, and an aging rate of 1 ppm per year over the operating temperature range. This level of accuracy is achieved by using highly stable ceramic dielectric materials and low-noise components.

The CVCO55CC-2400-2400 employs two phase-locked loops that work together to deliver the output signal and maintain its frequency accuracy. The first PLL is used to set the center frequency of the output signal. This PLL uses a reference crystal oscillator and a voltage-controlled crystal oscillator (VCXO). The VCXO is the heart of the PLL and generates the signal that is then applied to the second PLL.

The second PLL generates the output signal by combining the output of the VCXO with the input voltage. This combination of signals is then processed through the loop filter and fed back to the VCXO. With this feedback loop in place, the output frequency is held at the value set by the voltage. Thus, by adjusting the input voltage, the frequency of the output signal can be controlled with precision.

Conclusion

The CVCO55CC-2400-2400 is a highly reliable and accurate voltage-controlled oscillator. Its fast switching time of 0.1 μs makes it ideal for applications such as data communications and wireless LAN systems. The two phase-locked loops used in the circuit enable accurate frequency control of the output signal over a wide range of input voltages. This level of accuracy is achieved by using highly stable ceramic dielectric materials and low-noise components.

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