What are the most critical points? • Cooling system • Pixels (488) • Common outlet line (28) • ? • Strips (552):? • Environment (530) • Pixels:? • Strips:? • Outer volume:? ? REPORT OF THE SPECIFICATIONS REVIEW – TEMPERATURE MONITORING • NTC? • Where is described? How much time between temperature event and catastrophic damage?
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What are the most critical points?• Cooling system
• Pixels (488)• Common outlet line (28)• ?
• Strips (552):?
• Environment (530)• Pixels:?• Strips:?• Outer volume:?
?
REPORT OF THE SPECIFICATIONS REVIEW – TEMPERATURE MONITORING
• NTC?• Where is described?
How much time between temperature event and catastrophic damage?
64Pt10k
2-4 Wires/sensor
Signal cond.
(ADA4528)
ELMB2
CAN To DB
Impact of Op. Amplifier
• Increase x 20 signal-noise ratio: 970 mV voltage span vs. 44 mV w/o amplifier
• 1/f pink noise control: optimal for low frequency
• V_offset: 0,3 uV (Typ) – 2,5 uV (max) -> 5,7 mK max-error
• I_bias: 220 pA (Typ.) vs. 100 pA ADC on 100 mV range-> 0,37 mK max. error.
• Observations:
• Supply max. current: 2,1 mA
• Short tracks for NI input
• Radiation test necessary
• Readout mode: differential, 2,5 V input range, unipolar.
• Conversion rate?: to be defined from ELMB2 Specs. (Kamil) (Chopper frequency, Sps)
• 15 Sps x 64 channels = 4,3 s.
• 970 mV span -> 25410 bits
• “ELMB128 comprises a multiplexed 64-channel ADC with 16-bit resolution (and a 7-bit dynamic range, from 25 mV to 5 V)” (from ELMB user guide)
0,0E+00
2,0E-03
4,0E-03
6,0E-03
8,0E-03
1,0E-02
1,2E-02
6000 7000 8000 9000 10000 11000 12000 13000
K/b
it
Rp (Ω)
Resolution
With Amp.
Noise free at 15 Sps
Next task• experimental measurement : Data vs. input noise.
• 64 differential ADC channels per ELMB• 32 amplifiers
150 mm
70 mm
12 mm
20 mm
Minimum required area (ref.: ELMB Mother board 80x180 mm)0,0
0,5
1,0
1,5
2,0
2,5
6000 8000 10000 12000 14000
Wit
h A
mp
.
Rp (Ω)
ADC input voltage
With Amp.
No Amp.
Gain selected to maximize signal-noise ratio: 900 mV voltage span vs. 44 mV w/o amplifier
• Rad. Test on preparation• Ljubljana, Bern, Birmingham?
“…This implies tolerance (with safety factors) to radiation up toabout 5 Gy and 3·1010 neutrons/cm2 for a period of 10 years and to amagnetic field up to 1.5 T.” (From ELMB user guide)
• In theory one by one calibration is NOT necessary with new DIN 0,3 sensors• To be verified experimentally: signal conditioning circuit + readout system
82 mm
61 mm
T (1/3 DIN) Error
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