Upload
roden
View
54
Download
4
Tags:
Embed Size (px)
DESCRIPTION
PADI Test @ Tsinghua. Jingbo Wang for Zhi Deng April, 2010. Test Setup. Oscilloscope (DPO7104 with P6247 diff. probe, 1GHz B.W.). 20dB Attenuator (DC-2GHz). Pulser (AFG3102). FEET Board with 2 PADI chips. Digital Output. Analog Output. ~28mV. ~250mV. Gain Estimation. - PowerPoint PPT Presentation
Citation preview
PADI Test @ Tsinghua
Jingbo Wang for Zhi DengApril, 2010
1
Test Setup
Pulser (AFG3102)
FEET Board with 2 PADI chips
20dB Attenuator (DC-2GHz)
Oscilloscope (DPO7104 with P6247 diff. probe, 1GHz B.W.)
2
~250mV
~28mV
Analog Output Digital Output
3
Gain Estimation
• Assuming 5ns rise time with 1-order RC response of the test voltage pulse
~1pF 50ohm
tr= 5nsI in
Gain = 277mV/mA
Just a rough estimation, sensitive to the coupling capacitor, signal rise time
Input current with 1V 5ns-rise time step signal
4
1V
Spikes
Without discriminator fired With discriminator fired
5
Averaged picture
Caused by logic transition?
Without discriminator fired With discriminator fired
6
Output width vs. Input current
7
Test with MRPC
Digital output
Analog output
Telescope PMT coni. output
8
Digital output
Analog output
Telescope PMT coni. output
Output from FEE of STAR TOFr
9
10
PADI jitter Test
11
Test setup
Signal Generator
CH1
CH2
TTL
Oscilloscope
CH1
CH2
AUX (trigger)
PADIDiff. probe
CH2 CH1
2 2 2PADI signal_generatorT
T T T
12
Signal Generator Only
CH1CH2
signal_generator 18.6ps 13
With PADI
CH1CH2
T 55.38ps@ 2VinV 14
Test Results
15