Download - Student Meeting Jose Luis Sirvent PhD. Student 26/08/2013

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Page 1: Student Meeting Jose Luis  Sirvent PhD. Student 26/08/2013

Beam Secondary Shower Acquisition System: Front-End RF Design (2)

Student MeetingJose Luis Sirvent

PhD. Student26/08/2013

Page 2: Student Meeting Jose Luis  Sirvent PhD. Student 26/08/2013

-20dB

40dB

-6dB

pCVD

CividecAmplifier

Attenuator

CividecDiamond Detector

DC-4GHzSplitter

-6dB

-6dBDC-4GHzSplitter

-6dB

34dB

-12dB

-32dB

-6dB

HV

12V

Tunnel

Surface

1. The dynamic range and the three lines• Front-End proposal

Termination50Ω

Fc= 5 Hz

Low Pass Filter

DC

• Not yet clear:1. If DC measurement is necessary then -9dB splitter: Needed lines 34dB, -15dB & -35dB2. ADC or QIE10?ADC Needed filters in lines 200MHz – 2GHzQIE10 Needed Amplif DC-2GHz or no AmplifProblem for Long lines + QIE10??

Page 3: Student Meeting Jose Luis  Sirvent PhD. Student 26/08/2013

1.Front-End amplifier selection• Option 1: Commercial from Cividec

Price: 1755 CHF Price: 1755 CHF

Page 4: Student Meeting Jose Luis  Sirvent PhD. Student 26/08/2013

1.Front-End amplifier selection• Option 2: Build our own amplifier with Gali + MGA

– Cheaper alternativeDevelopment of a board

– Inside Cividec 40dBGali 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

Page 5: Student Meeting Jose Luis  Sirvent PhD. Student 26/08/2013

1.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

Page 6: Student Meeting Jose Luis  Sirvent PhD. Student 26/08/2013

1.Front-End amplifier selection• Option 4: Build our own amplifier • with BJTs

• http://www.intersil.com/content/dam/Intersil/documents/an15/an1503.pdf

Page 7: Student Meeting Jose Luis  Sirvent PhD. Student 26/08/2013

2. Noise study in lines (In simulation)

New!

2 4 6 8 10 12 14

x 10-4

-2

-1

0

1

2

x 10-3

Time (s)

Am

plitu

de (V

)

104

105

106

107

108

109

0

2

4

6

8

10

x 10-7

Frequency (Hz)

|Y(f)

|

-2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5

x 10-3

0

1

2

3

4

5

6x 10

5

Volts

Num

ber o

f point

s

Noise distributionGaussian fit mean:0.28uV sigma:378uV

Measured in SPS BA5

Page 8: Student Meeting Jose Luis  Sirvent PhD. Student 26/08/2013

2. Noise study in linesExample of digitalization with noise (Sigma=6.4mV)

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

x 10-3

0

0.2

0.4

0.6

0.8

1

Time (s)

Am

plitu

de (v

)

Digitalized profile ADC 14 bits

ADCC GFit Sigma:714.98um

ADCB GFit Sigma:566.73um

ADCA GFit Sigma:313.05um

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

x 10-3

-10

-5

0

5

10

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

x 10-3

0

0.2

0.4

0.6

0.8

1

Time (s)

Am

plitu

de (v

)

Digitalized profile ADC 14 bits

ADCC GFit Sigma:780.93um

ADCB GFit Sigma:570.95um

ADCA GFit Sigma:317.58um

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

x 10-3

-10

-5

0

5

10

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

x 10-3

0

0.5

1

1.5

2

2.5

3

x 10-10

Position (um)

Cha

rge

(C)

Digitalized profile QIE10

QIE10C GFit Sigma:563.2um

QIE10B GFit Sigma:566.26um

QIE10A GFit Sigma:358.4um

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

x 10-3

-10

-5

0

5

10

ADC Shaper Off QIE10 ADC Shaper On

Page 9: Student Meeting Jose Luis  Sirvent PhD. Student 26/08/2013

2. Noise study in linesEvolution of the Beam Sigma Error VS Noise

Considerations:1. 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.

2. 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:3. QIE10 performs well by integrating , the mean noise value is 0 so in certain way integration filters noise.4. As specked GausFit error increases with noise up to near 10% for these conditions and Noise sigma=102.4mV5. For low noise (sigma < 1.6mV) Best ADC Shaper ON / For high noise (sigma > 1.6mV) Best QIE10

Page 10: Student Meeting Jose Luis  Sirvent PhD. Student 26/08/2013

-20dB

pCVD Attenuator

CividecDiamond Detector -6dB

DC-4GHzSplitter

-6dB

-6dB

-20dB

HV

Tunnel Surface

2. Noise study in linesFor QIE10 we cannot amplify…so…• Long lines QIE10 Front-End proposal

Termination50Ω

Long CK50 link (~100m)

Fc= 5 Hz

Low Pass Filter

DC

0.5 1 1.5 2 2.5 3 3.5 4 4.5

x 10-3

0

10

20x 10

-12

Position (um)

Cha

rge

(C)

Digitalized profile QIE10

QIE10C GFit Sigma:562.83um

QIE10B GFit Sigma:566.24um

QIE10A GFit Sigma:566.14um

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

x 10-3

-10

-5

0

5

10

QIE10

Page 11: Student Meeting Jose Luis  Sirvent PhD. Student 26/08/2013

2. Noise study in linesFor QIE10 we cannot amplify…so…

Considerations:1. Metres of cable considered for the simulations: 100m2. In any case not taken into account impedance mismatching / reflections

Observations:3. For same conditions in average QIE10 performs better4. Obviously in the previous case QIE10 part of the scan was amplified (by simulation) and therefore the SNR was better 5. Tendency shown as previously6. QIE10 performance affected by noise and lines attenuation (SNR)