Font 4 ReviewDigital Feedback System
BPMAnalogueProcessor
Digital Processor
Feather Kicker
Power Amplifier
Pick up Striplines Kicker StriplinesBeam
Hardware & Firmware
Study of the Digital Feedback System divided the design task into two sections
• Hardware DesignBPM Analogue ProcessorDigital board using high speed ADCs,
DACs and FPGAPower Amplifier for driving the Kicker
• Firmware DesignSampling, processing and outputting the results
Block Diagram of Digital Board
Digital Board
2 x Analog Input channels (single-ended)
2 x Analog Output channels (differential) 4 x General-purpose digital outputs
3 x external clock/trigger inputs
Xilinx FPGA Virtex4
Analog Devices ADC/DACs
40 MHz oscillator
RS232 comms
JTAG port PROM
GP I/O Header
Block Diagram of BPM Analogue Processor
BPM Analogue Processor Version 1
• New PCB front-end processors designed and built – based on FONT3 processor (connectorised components)
• Integrated 2-channel board (sum and difference), ease-of-use (less set-up), greater reliability, simplified phasing of the local oscillator, optional amplifier mounting.
Stripline Inputs
Raw sum loopback
LO input
Difference output
Sum (I) output
Sum Q output
BPM Analogue Processor Version 2
TMD Power Amplifier
Power Amplifier and Kicker
Future Work• Modify Digital Board for minor errors or redesign its layout which
needs more investigation of the board and finding its shortcomings• Design a new board for FONT5 considering the experiences
obtained from Digital Board, newer ADCs, DACs and FPGA• Modify the layout of the BPM Analogue Processor considering the
necessity of the output amplifiers or redesigning the board considering higher resolution
• Designing an FPGA board for signal simulation• Is the design of the Kicker Amplifier final or some improvements or
redesign are needed? • The need of integrating the MiniCircuits Amplifier in our boards?
• Other considerations?
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