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operational-performance

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PT04 Advantages Of Implementing Digital Receivers In Field Programmable Gate Arrays (FPGA) controls, diagnostics, industrial-accelerators, instrumentation 175
 
  • S. Bremec, R. Uršič, U. Mavrič
    I-Tech, Instrumentation Technologies, Solkan, Slovenia
  Today’s state-of-the-art FPGA technology allows designers to satisfy almost any demand for high-speed data processing needed in DSP applications and fast data transfers. Dedicated FPGA resources are used in DSP applications to perform down conversion, filtering and data formatting. New trends in system architecture favor serial data transfer rather than parallel by using FPGA’s internal resources, BRAMs, high speed serial IOs and hard core processors.  
 
PT05 Experience With Sampling Of 500 MHz Rf Signal For Digital Receiver Applications controls, diagnostics, industrial-accelerators, instrumentation 178
 
  • U. Mavrič, S. Bremec, R. Uršič
    I-Tech, Instrumentation Technologies, Solkan, Slovenia
  This article will present test results of a prototype system that was built to evaluate feasibility of a direct sampling of a 500 MHz RF signal for use in digital receiver applications. The system consists of a variable gain RF front end, a fast analog to digital converter (ADC) and a field programmable gate array (FPGA) providing glue-logic between the ADC and a PC computer.  
 
PT06 Dynamic X-Y Crosstalk / Aliasing Errors of Multiplexing BPMs instrumentation, diagnostics, pick-up, monitoring, controls, feedback 181
 
  • T. Straumann
    SLAC, Stanford Linear Accelerator, Stanford, CA, USA
  Multiplexing Beam Position Monitors (BPM) are widely used for their simplicity and inherent drift cancellation property. These systems successively feed the signals of (typically four RF) pickups through one single detector channel. The beam position is calculated from the demultiplexed (base band) signal. However, as shown by this contribution, transverse beam motion results in positional aliasing errors due to the finite multiplexing frequency. Fast horizontal motion, for example, can alias into an apparent, slow vertical position change. A thorough analysis is presented and the impact of essential parameters such as the multiplexing rate and the scanning pattern/sequence of classical 4-button pickups is discussed.