Download - 1 Design Review Slow Control Part Hervé MATHEZ IPNL CNRS SLOW CONTROL PART IN FPPA 2000/2001
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Design Review Slow Control Part
Hervé MATHEZ IPNL CNRS
SLOW CONTROL PARTIN
FPPA 2000/2001
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Design Review Slow Control Part
Hervé MATHEZ IPNL CNRS
LEAKAGE CURRENT SPECIFICATIONS
Input : 20nA to 20µA for twin APD Leakage current return to ground (only FPPA gnd point)
No schematic changes between FPPA2000 and FPPA2001
APD anode voltage must be stabilized at ± 25 mV (Rp, HV) Minimum leakage current to be measured ± 200 nA (Il(T), T) Non linearity over full scale is 1% Low input bias current amplifier Output 0.5 V to 2.5V compatible with FPU input
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Design Review Slow Control Part
Hervé MATHEZ IPNL CNRS
TEMPERATURE MEASUREMENT SPECIFICATIONS
Range : 5°C to 25°C T to be measured : ± 0.1°C Current measurement through a thermistor (R25°C = 100 k, = 3960 K)
between 2 constant voltages (2.4V and 1.2V, self heating)
Input current : 4.3 µA to 12 µA @ 18°C, 0.1°C is 40 nA Constant voltage must stabilized at ±5 mV Non linearity : 0.3% Output 0.5 V to 2.5V compatible with FPU input
No schematic changes between FPPA2000 and FPPA2001
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Design Review Slow Control Part
Hervé MATHEZ IPNL CNRS
+
-
+
-
C*Vref ADC
+ -
HV
APD
Rf
Rp
Vout (ILeakage)
ADC Output = f (VrefADC,Rf)External componentsOTA2 Open loop gain 90dB, Fc< 1kHz, with output capacitor of 5pF
Phase margin 80° (Also used in temperature measurement)OTA1 is modified in order to Vanode APD goes to 0V
Open loop gain 65dB, Fc< 20kHz, with output capacitor of 5pFPhase margin 80°
HOW TO DO LEAKAGE CURRENT MEASUREMENT ?
OTA1
OTA2
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Design Review Slow Control Part
Hervé MATHEZ IPNL CNRS
C*Vref ADC
+
-Vout (dummy)
Rf
Rf
C*Vref ADC
-
-
B*Vref ADC
B*Vref ADC
+
-+
-
+
+
A*Vref ADC
A*Vref ADC+
-
+
-
Roff
R(T)
Rdummy
VCC
Vout (T)
A*Vref ADC
ADC Output = f (R(T),Roff ,Rf)External componentsAll same OTA have input bias current compensated
HOW TO DO TEMPERATURE MEASUREMENT ?
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Design Review Slow Control Part
Hervé MATHEZ IPNL CNRS
OTA FOR BOTH MEASUREMENTS
OTA 1OTA 2
GdB=90 dBPhase Margin=80°
GdB=65 dBPhase Margin=80°
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Design Review Slow Control Part
Hervé MATHEZ IPNL CNRS
LEAKAGE CURRENT MONTE CARLO ANALYSIS(FPPA2000)
Vout LEAK [V] = f(I leak) [µA]
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0 5 10 15 20
Linearity Error [%PE] = f(Run Monte Carlo I leak)
0
0.5
1
1.5
2
2.5
3
0 10 20 30 40 50
0.5 V < Vout < 2.5 V < 1 %
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Design Review Slow Control Part
Hervé MATHEZ IPNL CNRS
LEAKAGE CURRENT MONTE CARLO ANALYSIS(FPPA2000)
V anode APD [mV] = f(I leak) [µA]
-1.2E-02
-1.0E-02
-8.0E-03
-6.0E-03
-4.0E-03
-2.0E-03
0.0E+00
2.0E-03
4.0E-03
6.0E-03
8.0E-03
1.0E-02
0 2 4 6 8 10 12 14 16 18 20
Delta V anode APD [µV] = f(Run Monte Carlo)
0
200
400
600
800
1000
1200
1400
1600
0 10 20 30 40 50
V anode APD 1.4 mV
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Design Review Slow Control Part
Hervé MATHEZ IPNL CNRS
I inm OTA_N_IL [A] = f(I leak) [µA]
-1.E-07
-8.E-08
-6.E-08
-4.E-08
-2.E-08
0.E+00
2.E-08
4.E-08
6.E-08
8.E-08
1.E-07
0 5 10 15 20
Delta I inm OTA_N_IL [A] = f(Run Monte Carlo)
0.0E+00
2.0E-10
4.0E-10
6.0E-10
8.0E-10
1.0E-09
1.2E-09
1.4E-09
1.6E-09
0 10 20 30 40 50
LEAKAGE CURRENT MONTE CARLO ANALYSIS(FPPA2000)
Input Bias Current < 50 nA (except for 5 MC run)
Very low variation versus input current
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Design Review Slow Control Part
Hervé MATHEZ IPNL CNRS
TEMPERATURE MEASUREMENT MONTE CARLO ANALYSIS(FPPA2000)
Vout [V] = f(I ntc) [µA]
0.30
0.80
1.30
1.80
2.30
2.80
4 6 8 10 12
Linearity Error [%PE] = F(Run Monte Carlo I ntc)
0
0.02
0.04
0.06
0.08
0.1
0.12
0 10 20 30 40 50
0.5 V < Vout < 2.5 V << 0.1 %
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Design Review Slow Control Part
Hervé MATHEZ IPNL CNRS
Delta V ntc [µV] = f(Run Monte Carlo)
30
35
40
45
50
55
60
65
70
0 5 10 15 20 25 30 35 40 45 50
IRoff [µA] = f(Run Monte Carlo)
-4.33E-06
-4.32E-06
-4.31E-06
-4.30E-06
-4.29E-06
-4.28E-06
-4.27E-06
-4.26E-06
-4.25E-06
-4.24E-06
-4.23E-06
0 5 10 15 20 25 30 35 40 45 50
TEMPERATURE MEASUREMENT MONTE CARLO ANALYSIS(FPPA2000)
1.2 V Voltage variation across R(T)over the full range
Offset current for 50 MC run
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Design Review Slow Control Part
Hervé MATHEZ IPNL CNRS
SUMMURAY OF MONTE CARLO ANALYSIS(FPPA2000)
Temperature
Input Current
Leakage
Input Current
Additional BJT to providehigh reverse voltage Base-Emitter noticed by MC simulations
All other simulations(transient) are correct
Offset Current Ouput
Voltage reference
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Design Review Slow Control Part
Hervé MATHEZ IPNL CNRS
CONCLUSION(FPPA2000)
SLOW CONTROL PART WORKS WELL
AND ALLMEASUREMENTS
ARE INSPECIFICATION