CVCO55CL-1100-1200

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Voltage controlled oscillators (VCOs) are, as the name suggests, oscillators that have an output frequency that is proportional to the applied control voltage. They are a class of signal generators which are used in a variety of applications, from radio frequency (RF) to audio and communication circuits. A VCO is typically a linear oscillator whose frequency is determined by a resistor-capacitor (RC) circuit, or sometimes a varactor diode, across which a control voltage is applied. The simplest form of VCO is the relaxation oscillator, where the output is a square wave, or sometimes a triangular or sawtooth wave, with a frequency that varies with the control voltage. However, more complex oscillators, such as phase-locked loops, can also use a VCO in which the frequency varies with the applied control voltage. The CVCO55CL-1100-1200 is a high performance voltage controlled oscillator (VCO) designed specifically for use in communications applications. It has an excellent frequency stability and phase noise performance, providing an ideal solution for modulation and demodulation of digital and analog signals. The VCO operates over the frequency range of 1100 to 1200 MHz, with a tuning voltage range of 0.5 to 4.5 V. It is capable of providing an output power of +4 dBm, and has a temperature stability of +/- 2 ppm over the operating temperature range of -40ºC to +85ºC.The CVCO55CL-1100-1200 is based on a voltage controlled oscillator (VCO) topology that consists of a frequency tuned inductor and a varactor diode. The varactor diode acts as a variable capacitor for controlling the frequency of oscillation and is typically biased with a constant current source. The frequency of oscillation is determined by the parallel KVCO and CPE tank circuit, which are connected in series with the varactor diode. The oscillation amplitude and phase noise performance of the VCO is determined by the capacitor (C2) and resistance (R1) values of the bias circuit, as well as by the capacitor CR1 and CR2 that control the amplitude. The frequency range of the VCO can be adjusted by modifying the values of the resistors R1 and R2, and the bias current can be adjusted with the resistor R3.The CPE (conceptual parallel element) tank circuit of the CVCO55CL-1100-1200 consists of a high-performance varactor diode, a series-tuned inductor, and two parallel-tuned capacitors. The series component of the tank circuit provides for the desired frequency range and the parallel-tuned capacitors provide for the frequency-to-voltage (F/V) transfer characteristic. The F/V curve provides for a linear frequency output over a wide input voltage range without large degeneration effects. The tank circuit is tuned to resonate at the intended frequency, and a varactor diode is used to vary the capacitance of the tank as the control voltage is varied.The CVCO55CL-1100-1200 also has an on-chip trimming function to optimize the F/V transfer characteristic. An on-chip resistor is used to adjust the amplitude and linearity of the transfer characteristic of the VCO, and to achieve a tighter frequency control over wide temperature variations. The CVCO55CL-1100-1200 is packaged in a 5mm x 6mm plastic QFN package and is suitable for use in high-volume applications.In conclusion, the CVCO55CL-1100-1200 voltage controlled oscillator is an excellent choice for communications applications. It features excellent frequency stability, phase noise performance and a wide control voltage range. It can also be trimmed to provide a precise frequency output over wide temperature variations. This makes it an ideal choice for applications such as Frequency Modulation/Demodulation (FM/DM) and Frequency Hopping Spread Spectrum (FHSS) applications.

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