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Применения > > Low Noise, 12 GHz, Microwave Fractional-N Phase-Locked Loop (PLL) Using an Active Loop Filter and RF Prescaler

Low Noise, 12 GHz, Microwave Fractional-N Phase-Locked Loop (PLL) Using an Active Loop Filter and RF Prescaler (cn0174)

This circuit is a complete implementation of a low noise microwave fractional-N PLL using the ADF4156 as the core fractional-N PLL device. The ADF5001 external prescaler is used to extend the frequency range of the PLL up to 18 GHz. An ultralow noise OP184 op amp with appropriate biasing and filtering is used to drive a microwave VCO to implement a complete low noise PLL at 12 GHz with a measured integrated phase noise of 0.35 ps rms. This function is typically used to generate the local oscillator frequency (LO) for applications such as microwave point-to-point systems, test and measurement equipment, automotive radar, and military applications.



Figure 1. Low Noise Microwave Fractional-N PLL (Simplified Schematic: All Connections and Decoupling Not Shown)

Возможности

  • Fractional-N PLL up to 18GHz
  • Low system phase noise of 0.35 ps rms @ 12GHz

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Схемы и диаграммы

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