Title :
A digital phase and amplitude feedforward correction system
Author :
Yu, David ; Conway, Pat
Author_Institution :
DULY Res. Inc., Rancho Palos Verdes, CA, USA
Abstract :
We have designed and fabricated a phase and amplitude correction system (PACS) using digital microelectronic circuitries and microstrip RF components with subnanosecond switching and response time. The control system uses a feedforward scheme to correct unwanted variations in phase and amplitude of a short (<100 ns) RF pulse which is generated repeatedly by an external RF source (e.g. relativistic klystron, FEL). Programmable or constant phase and amplitude (to within 0.5° and 0.1 dB, respectively) are achievable with the PACS. The system features a digitally programmable phase shifter and attenuator based on a direct RF digital-to-analog converter (RFDAC)
Keywords :
beam handling techniques; particle beam diagnostics; FEL; PACS; RF pulse; RFDAC; amplitude feedforward correction system; attenuator; control system; digital microelectronic circuitries; digital phase system; digitally programmable phase shifter; direct RF digital-to-analog converter; external RF source; microstrip RF components; relativistic klystron; response time; subnanosecond switching; Control systems; Delay; Klystrons; Microelectronics; Microstrip components; Phase shifters; Picture archiving and communication systems; Pulse generation; Radio frequency; Switching circuits;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.309331
