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## **Project Specification:**
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## **Project Specification:**
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[document:RFFE-Specification-Document-v2.pdf](https://www.ohwr.org/project/document/wikis)
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[document:RFFE-Specification-Document-v2.pdf](https://www.ohwr.org/project/document/wikis)
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The RFFEv1 is an analog Front-End that has four RF inputs and provides
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The RFFEv1 is a four channel analog RF Front-End designed and optimized
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four calibration schemes with an improved performance in terms of
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for 500 MHz operation. Four calibration schemes were designed to
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linearity and long term stability.
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improved the performance in terms of linearity and long term stability.
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Calibration schemes:
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Resume of the calibration schemes:
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On-line pilot-tone: Couple a reference RF signal to the beam signal into
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On-line pilot-tone: Couple a reference RF signal to the beam signal into
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the four RF chains at the same time.
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the four RF chains at the same time.
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Off-line pilot-tone: Couple a reference signal to each of the RF
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Off-line pilot-tone: Couple a reference signal to each of the RF
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channels, one by one, turning off the beam signal.
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channels, one by one, turning off the beam signal.
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Temperature controller: The RFFEv1 has 14 RTD's and distributed heaters
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Temperature controller: The RFFEv1 has 14 RTD's and distributed heaters
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on the board.
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on the board in order to implement control loop outside the PCB.
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Crossbar switching: Provides a crossbar scheme to swap the channels 2x2.
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Crossbar switching: Provides a crossbar scheme to swap the channels 2x2.
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## **Measured Characteristics**
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## **RFFEv1 Characteristics**
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RFFE\_Measurements.png
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RFFE\_Measurements.png
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## **RF Chain of the four channels**
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## **Four channels RF Chain**
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RFFE\_Chain.png
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RFFE\_Chain.png
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RFFE\_Chain.png
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RFFE\_Chain.png
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