CVCO55CC-0787-0805

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Voltage Controlled Oscillator (VCO) is a type of oscillating circuit whose main purpose is to produce a frequency to a predetermined circuit by varying the voltage applied to it. The frequency of the generated signal can be a relatively constant frequency or a frequency which changes as per the applied voltage. CVCO55CC-0787-0805 is a VCO from Knowles Corp which is typically used in applications such as military, industrial, telecom and instrumentation. This article explores the CVCO55CC-0787-0805\'s application field and working principle.

Application Field

The CVCO55CC-0787-0805 is a wideband VCO that covers both the VHF and UHF frequencies. It is designed for general purpose usage, such as for wireless, communications, and automotive markets. This VCO has a temperature stability of 0.2-0.3ppm/°C over a temperature range of -40°C to +85°C, making it particularly suitable for applications that require high-temperature performance. The CVCO55CC-0787-0805 also has excellent linearity, a low phase noise floor, and wide pull range. These characteristics make the VCO suitable for a variety of applications, including radio transmitters and receivers, test and measurement, automation systems, and in some consumer applications.

Working Principle

In general, VCOs operate on an open loop principle. This implies that if an alternating voltage is applied to the circuit, the output of the VCO will oscillate at a frequency proportional to the applied voltage. Typically, when a voltage is applied, a varying current flows through a resonator, which is usually a quartz crystal. This current vibrates the crystal, in turn vibrating it at the frequency of the alternating voltage. The alternating current flows through the resonator and provides an output signal that is normally in the form of a sine wave. The frequency of the output wave will be determined by the applied voltage.

The CVCO55CC-0787-0805 features a well-tuned resonator that covers both the VHF and UHF frequencies. This resonator will excite the voltage-controlled oscillator and will produce a waveform that is a sine wave. This sine wave will have the same waveform as the applied voltage. The frequency of this waveform will be proportional to the magnitude of the voltage, with a higher voltage resulting in a higher frequency.

In addition, this particular VCO features a PLL (Phase Locked Loop) to ensure that the output frequency is obtained as per the applied voltage. The PLL consists of a loop filter, oscillator and a phase detector. The loop filter has a gain which determines the speed with which the PLL can lock onto the applied voltage. The phase detector compares the phase of the output of the oscillator to the phase of the input voltage, and the loop filter corrects the frequency if there is any discrepancy. The output of this entire circuit will be a waveform which is locked onto the frequency of the input voltage, and thus behaves in the same manner as a voltage-controlled oscillator.

Conclusion

The CVCO55CC-0787-0805 is a wideband VCO that covers both the VHF and UHF frequencies. It has excellent temperature, linearity and pull range characteristics, making it suitable for a variety of applications. This VCO works on an open loop principle, with an alternating voltage applied to the circuit. This voltage vibrates a quartz crystal and produces an alternating current output in the form of a sine wave, whose frequency is proportional to the magnitude of the applied voltage. The output frequency is controlled by a PLL which ensures that the output waveform is in line with the particular frequency of the applied voltage. Thus, this VCO function as an excellent Voltage Controlled Oscillator with superior characteristics.

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