Stability of the Master Oscillator for FLASH at DESY

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46 4 MASTER OSCILLATOR The blockdiagram in figure 55 illustrates the entire PLL to synchronize the reference frequency 81.2499997 MHz and the 2.856001105 GHz oscillator. Figure 55: LOLA PLL The oscillator is generated by mixing the second harmonic at 200 MHz of a high stable crystal oscillator with a SAW (Surface Acoustic Wave) oscillator at 2488 MHz. The mixing product is filtered out with a bandpass filter and amplified in the end. The VCOs characteristics are sketched in figures 56, 57 and 58. Output Frequency [GHz] 2.8575 2.857 2.8565 2.856 2.8555 2.855 2.8545 2.854 0 0.5 1 1.5 2 2.5 Tuning Voltage [V] 3 3.5 4 4.5 5 Figure 56: Tuning slope of 2.856 GHz VCO
4.3 1.3 GHz and 2.856 GHz phase locked loops 47 Phase Noise [dBc/Hz] Sensitivity [MHz/V] 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0.5 1 1.5 2 2.5 Tuning Voltage [V] 3 3.5 4 4.5 5 20 0 −20 −40 −60 −80 −100 −120 −140 10 0 −160 10 1 Figure 57: Tuning sensitivity 10 2 10 3 10 4 Offsetfrequency [Hz] Figure 58: Free running phase noise at 2.856 GHz Determination of output frequency: The outputput frequency of the entire PLL can be calculated like fRF = PFD ( INT + FRAC/MOD) (27) 10 5 10 6 10 7
Page 1 and 2: Stability of the Master Oscillator
Page 3 and 4: CONTENTS 3 Contents 1 Motivation 4
Page 5 and 6: 1.2 Assignment 5 1.2 Assignment The
Page 7 and 8: 2.2 Transmission of amplitude - and
Page 9 and 10: 2.5 Integrated phase noise and timi
Page 11 and 12: 3.2 Drift measurement methods 11 3.
Page 13 and 14: 3.2 Drift measurement methods 13 Fi
Page 15 and 16: 3.2 Drift measurement methods 15 Fi
Page 17 and 18: 4.1 Overview 17 The frequencies req
Page 19 and 20: 4.2 Low Power Part 19 Figure 12: Lo
Page 21 and 22: 4.2 Low Power Part 21 fredquency [M
Page 23 and 24: 4.2 Low Power Part 23 Figure 17: Ph
Page 25 and 26: 4.2 Low Power Part 25 81 MHz VCXO c
Page 27 and 28: 4.2 Low Power Part 27 Sensitivity [
Page 29 and 30: 4.2 Low Power Part 29 The circuit f
Page 31 and 32: 4.2 Low Power Part 31 The same has
Page 33 and 34: 4.2 Low Power Part 33 Magnitude (dB
Page 35 and 36: 4.2 Low Power Part 35 4.2.3 Divider
Page 37 and 38: 4.2 Low Power Part 37 fundamental 1
Page 39 and 40: 4.3 1.3 GHz and 2.856 GHz phase loc
Page 45: 4.3 1.3 GHz and 2.856 GHz phase loc
Page 49 and 50: 4.4 High Power Part for amplificati
Page 51 and 52: Acknowledgements I would like to th
Page 53 and 54: Figure 61: Blockdiagram low power p
Page 55 and 56: Figure 63: Blockdiagram of 1300 MHz
Page 57 and 58: REFERENCES 57 References [1] vuv-fe

Stability of the Master Oscillator for FLASH at DESY

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