FrontEnd RF Design 2 Student Meeting Jose Luis Sirvent PhD Student 26082013 20dB 40dB 6dB pCVD Civi dec Amplifier Attenuator Civi dec Diamond Detector DC4GHz Splitter 6dB ID: 787605
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Slide1
Beam Secondary Shower Acquisition System: Front-End RF Design (2)
Student Meeting
Jose Luis
Sirvent
PhD. Student
26/08/2013
Slide2-20dB
40dB
-6dB
pCVD
Civi
dec
Amplifier
Attenuator
Civi
dec
Diamond Detector
DC-4GHz
Splitter
-6dB
-6dB
DC-4GHz
Splitter
-6dB
34dB
-
12dB
-32dB
-
6dB
HV
12V
Tunnel
Surface
1. The dynamic range and the three lines
Front-End proposal
Termination
50
Ω
Fc= 5 Hz
Low Pass
Filter
DC
Not yet clear:
If DC measurement is necessary then -9dB splitter:
Needed lines 34dB, -15dB & -35dB
2. ADC or QIE10?
ADC
Needed filters in lines 200MHz – 2GHz
QIE10 Needed
Amplif
DC-2GHz or no
Amplif
Problem for Long lines + QIE10??
Slide31.Front-End amplifier selectionOption 1: Commercial from Cividec
Price: 1755 CHF
Price: 1755 CHF
Slide41.Front-End amplifier selectionOption 2: Build our own amplifier with Gali + MGA Cheaper alternativeDevelopment of a board
Inside
Cividec
40dB
Gali
52 (Price: 1.2€) Agilent MGA-62563
(Price: 8.2€)Radiation Tolerance:
Tested in 2005
http://lhc-expt-radmon.web.cern.ch/lhc-expt-radmon/meetings/2005-03/Gorisek-BCM%20in%20ATLAS.pdf
Slide51.Front-End amplifier selection
Option 3: Evaluation Boards (20dB) from Mini-Circuits
(Price: 52
€
)
http://217.34.103.131/pdfs/GALI-52+.
pdf
http://217.34.103.131/pcb/WTB-409-52+_P02.pdf
Slide61.Front-End amplifier selection
Option 4: Build our own amplifier
with BJTs
http://www.intersil.com/content/dam/Intersil/documents/an15/an1503.pdf
Slide72. Noise study in lines (In simulation)
New!
Measured in SPS BA5
Slide82. Noise study in linesExample of digitalization with noise (Sigma=6.4mV)
ADC Shaper Off
QIE10
ADC Shaper On
Slide92. Noise study in linesEvolution of the Beam Sigma Error VS Noise
Considerations
:
The noise is white: Distributed in the whole spectrum
ADC Shaper On
Still affected but working better than Shaper Off, in practice the results should be better.
The 40dB amplifier: Considered in simulations as ideal DC-infinite Hz (In reality RF 1MHz-2GHz)
The 34dB line in practice could not be used by the QIE10 since it has a high-pass filter, the value used should be -6dBObservations:QIE10 performs well by integrating , the mean noise value is 0 so in certain way integration filters noise.
As specked GausFit error increases with noise up to near 10% for these conditions and Noise sigma=102.4mVFor low noise (sigma < 1.6mV) Best ADC Shaper ON / For high noise (sigma > 1.6mV) Best QIE10
Slide10-20dB
pCVD
Attenuator
Civi
dec
Diamond Detector
-6dB
DC-4GHz
Splitter
-6dB
-
6dB
-20dB
HV
Tunnel
Surface
2. Noise study in lines
For QIE10 we cannot amplify…so…
Long lines QIE10 Front-End proposal
Termination
50
Ω
Long CK50 link
(~100m)
Fc= 5 Hz
Low Pass
Filter
DC
QIE10
Slide112. Noise study in lines
For QIE10 we cannot amplify…so…
Considerations
:
Metres of cable considered for the simulations: 100m
In any case not taken into account impedance mismatching / reflections
Observations
:For same conditions in average QIE10 performs betterObviously in the previous case QIE10 part of the scan was amplified (by simulation) and therefore the SNR was better
Tendency shown as previouslyQIE10 performance affected by noise and lines attenuation (SNR)