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Evaluation and Demonstration Boards and Kits

EV-ADF4108EB2Z application field and working principle

The highly integrated, low cost EV-ADF4108EB2Z is an evaluation and demonstration board and kit designed for the PLL-based ADF4108, RF synthesizer IC from Analog Devices, Inc. It evaluates the features and performance of the ADF4108 and its application circuits, as well as provides a basic RF functional demonstrator.

The ADF4108, RF synthesizer IC which is integrated on EV-ADF4108EB2Z, integrates high-performance, low-power fractional-N PLL synthesizers with VCO and selectable linear or logarithmic dividers on chip. It contains a high-performance 3rd order loop filter, absolute phase detector, and dual modulus prescaler. It also incorporates features such as ultralow phase noise and very high power saving.

Application field

The EV-ADF4108EB2Z evaluation and demonstration board and kit is suitable for a wide range of applications including:

• Communication systems
• Radar Systems
• Test & Measurement
• Portable radios
• Tuners

Working principle

The basic operating principles of EV-ADF4108EB2Z are explained as follows.

First, the ADF4108 integrated on the board separates the loop filter frequency range into 12 sections, each of which contains its own independent loop filter bandwidth and VCO tune voltage versus frequency curve. This allow the loop filter characteristics to be adjusted for optimal performance. The maximum loop bandwidth of the ADF4108 is 4KHz.

Second, an externally provided reference frequency is sent to the board. The ADF4108 low-phase-noise clock generator frequency is digitally programmable and provides the reference frequency. An external 10 MHz oscillator can also be used as a reference. Using the low-frequency crystal oscillator, the board then generates the loop filter clock frequency.

Finally, the synthesizer IC on EV-ADF4108EB2Z uses the phase difference between the reference signal and the internal VCO to generate a loop error signal. This loop error signal is then fed back to the PLL loop filter for further control of the VCO tuning voltage. Thus, the EV-ADF4108EB2Z board locks on to the phase error and the reference frequency to generate the output signal.

Conclusion

The EV-ADF4108EB2Z evaluation and demonstration board and kit is a low-cost, feature-rich design that enables evaluation and demonstration of the PLL-based ADF4108 RF synthesizer IC from Analog Devices. It supports a wide range of applications such as communication systems, radar systems, test & measurement, portable radios, and tuners. The operating principles of EV-ADF4108EB2Z are based on separating the loop filter frequency range into 12 sections and externally providing a reference frequency. This reference frequency is combined with the internal VCO and a loop error signal is fed back to the PLL loop filter for further control of the VCO tuning voltage.

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