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?