Transcription of Digital Signal Processing in RF Applications
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06 June 2007 CAS, Sigtuna, SwedenDSP Digital Signal ProcessingDigital Signal Processing in RF ApplicationsPart IThomas SchilcherRF applicationsCAS, Sigtuna, SwedenDSP Digital Signal ProcessingT. Schilcher06 June 20072 What are RF Applications ?any application which measures properties of an RF field (amplitude, phase, frequency, ..);typical frequencies in accelerators: MHz tens of GHzapplications which process the measured quantities to control and regulate RF fields(feedback and feedforward)RF applicationsCAS, Sigtuna, SwedenDSP Digital Signal ProcessingT. Schilcher06 June 20073 Typical RF applicationscavity field loops(amplitude and phase)klystron loops(amplitude and phase)tuner loops(cavity tuning)radial and phase loops(circular machines) RF gymnastics (bunch splitting and merging)Accelerators:CW / pulsed machineslinear / circular machinesApplication areas (examples):electron/hadron/ion acceleratorsnormal-/superconducting RF systemsRF applicationsCAS, Sigtuna, SwedenDSP Digital Signal ProcessingT.
Signal conditioning / down conversion Why down conversion of the RF signal? ADC speeds are limited. It is not reasonable/possible today to digitize high-frequency carriers directly. (f>500 MHz) ADC dynamic range is limited. 10 bit →60 dB 12 bit →72 dB 14 bit →84 dB ADC clock and aperture jitter become critical at high frequencies
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