VERITAS L1 trigger Constant Fraction Discriminator

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VERITAS L1 trigger

Constant Fraction Discriminator 

Vladimir Vassiliev Jeremy Smith

David Kieda

(2)

June, 2001 CFD design review 2

Content

Night Sky Background Noise

Traditional Threshold Discriminator Constant Fraction Discriminator

CFD: NSB and DC offset effects CFD: discriminator rate feedback CFD: schematic

CFD: simulated performance Pricing

Budget

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1 pe pulse: measurements

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June, 2001 CFD design review 4

1 pe pulse: simulations

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Night Sky Background (1)

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June, 2001 CFD design review 6

Night Sky Background (2)

Stephane’s LeBohec  calibration

m=7.4 is 0.2 pe/ns m=6.6 is 0.4 pe/ns m=5.9 is 0.8 pe/ns m=5.1 is 1.6 pe/ns m=4.4 is 3.2 pe/ns m=0.0  is  180 pe/ns

  

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Statistical characteristics of NSB amplitude, A(t).

1 st  momentum

<A(t)> Av t =Rate/1 pe peak     1pe peak=0.117 [ns ­1  pe ­1 ] 2 nd  momentum

<(A(t) ­ <A(t)>  Av t ) 2 >  Av t  =a 2  <A(t)>  Av t    a 2 =0.62  [pe]

3 rd  momentum

<(A(t) ­ <A(t)>  Av t ) 3 >  Av t  =a 3 2  <A(t)>  Av t   a 3 =0.81  [pe]

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June, 2001 CFD design review 8

Threshold discriminator

N U pe th U(t) =

Np e 5 Npe

 50 Npe

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Threshold discriminator rate

(positive edge)

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June, 2001 CFD design review 10

Peak trigger rate

(threshold discriminator)

VERITAS operation

region

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CFD in fADC channel

by Jim Buckley, WBS SP7

0 pe U(t)

3 N ) 2 pe U(t

N 3 )

(1 + 2 ⋅ ⋅ − + ⋅ ⋅ =

0 3 U(t) ) 2 U(t 3 )

(1 + 2 ⋅ − + ⋅ =

pe U(t) N dc (t)

U pe U(t)

3 N ) 2 pe U(t

N 3 )

(1 + 2 ⋅ ⋅ − + ⋅ ⋅ = + + ⋅

noise

Theory Practice

U(t) N pe

1 N pe

(t) N pe dc

U(t) U 3 ) 2 U(t 3 )

(1 + 2 ⋅ − + ⋅ = + + ⋅

noise

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June, 2001 CFD design review 12

CFD principle

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CF discriminator: 

rate vs. offset

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June, 2001 CFD design review 14

CF discriminator: 

HIGH state time fraction vs. offset

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CFD: 

HIGH state time fraction vs. rate

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June, 2001 CFD design review 16

CF discriminator dead time

(17)

CF discriminator time walk

(18)

June, 2001 CFD design review 18

CF discriminator time dispersion

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CF discriminator dead time

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June, 2001 CFD design review 20

CF discriminator time walk

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CF discriminator time dispersion

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June, 2001 CFD design review 22

CF discriminator time walk

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CF discriminator time dispersion

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June, 2001 CFD design review 24

Frequency to voltage feedback

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Original CFD board design

by Jim Buckley, WBS  SP7

Board Fabrication:   $18.70 Board Stuffing:         $27.50 Board Components: $22.80

WBS budget per board:  $69.00 

Total for 3,500 boards:    $241.5K

Total for CFDs in WBS:  $308.2K

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June, 2001 CFD design review 26

CFD Functional Schematic

1.5 ns  delay

CFD rate  feedback

f2V

Variable gain

Time walk optimization PMT

signal

Discriminator threshold adjustment

Zero crossing  comparator

Programmable  width

Coincidence  resolving time adjustment

fraction

Threshold discriminator

D CLK

Q

R

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CFD board schematic

(28)

June, 2001 CFD design review 28

f2V SPICE simulations

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f2V 2MHz input

(30)

June, 2001 CFD design review 30

f2V 20MHz input

(31)

Variable Gain Circuit

(32)

June, 2001 CFD design review 32

Variable Gain (10 MHz)

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Variable Gain (50 MHz)

(34)

June, 2001 CFD design review 34

Variable Gain (n=64)

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L1 Width circuit

(36)

June, 2001 CFD design review 36

Width simulations

(37)

CFD board pin­outs

P in Na m e /Function De scription S pe cifica tion

J10­1 A G ND A nalog G round

J10­2 IN P M T S ignal Input ­1.9m V /pe

J10­3 ­5V A A nalog P ower ­5  V

J10­4 W IDTH L1 W idth Control + 0.0V  to ­1.25V

J10­5 TH Dis crim inator Thres hold Control + 0.1V  to ­2.6V

J10­6 RFB Rate FeedB ack  Control ­3.26 m V /pe

J10­7 + 5V A A nalog P ower + 5  V

J10­8 Not in use

J10­9 M O DE Trigger M ode Control E CL 

J10­10 G ND Digital G round

J10­11 ­2V Digital E CL term ination ­2  V

J10­12 ­5.2V Digital P ower ­5.2  V

J10­13 DO UT S erial Data O utput TTL/CM O S

J10­14 O UT+ P os itive Trigger O utput E CL

J10­15 O UT­ Negative Trigger O utput E CL

J10­16 DIN S erial Data Input TTL/CM O S

J10­17 DCK S erial Data Cloc k (Ris ing E dge) TTL/CM O S J10­18 DE N

S erial Data S trobe (Clock data while 

LO W , Latch data on ris ing edge) TTL/CM O S

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June, 2001 CFD design review 38

CFD board components

# P art D es c ription R ef D es M anufac turerV endor Q nty C os t(500) Total(500) C os t(3000) Total(3000) P ac k age 1 A D 9687C S D ual, U ltra­F as t E C L­O utput C om paratorU 1 M ax im M ax im 1 $    6.000 $   6.000 $     5.120 $     5.120 S O ­16 2 A D 8009A R Low  D is tortion A m plifier, 1G H z , 5500V /uSU 2 A nalog D evic esF uture 2 $    3.770 $   7.540 $     2.397 $     4.795 S O ­8 3 M A X9690 U ltra­F as t E C L­O utput C om parator U 3 M ax im M ax im 1 $    6.000 $   6.000 $     3.290 $     3.290 S O ­8 4 A D 7376A R U 50 D igital P otentiom eter, + /­15V  O per U 4 A nalog D evic esF uture 1 $    2.950 $   2.950 $     2.950 $     2.950 TS S O P ­14 5 M A X478C S A D ual P rec is ion O p A m p U 5,10 M ax im M ax im 2 $    2.580 $   5.160 $     2.580 $     5.160 S O ­8 6 M C 10E L58D E C L 2:1 M ultiplex er U 6 O N  S em ic onduc torF uture 1 $    4.650 $   4.650 $     4.650 $     4.650 S O ­8 7 M C 10E L31D E C L D  F lip­F lop w ith S et and R es et U 7,8 O N  S em ic onduc torF uture 2 $    4.542 $   9.084 $     4.542 $     9.084 S O ­8 8 M A X5104C E E D ual 12­B it D A C , V oltage O ut, S erial Interfac eU 9 M ax im M ax im 1 $    3.750 $   3.750 $     3.750 $     3.750 Q S O P ­16 9 M A X6021B V oltage R eferenc e, 2.048V U 12 M ax im M ax im 1 $    1.170 $   1.170 $     1.170 $     1.170 S O T­23 10 M C 10E LT24D 5V  TTL to D ifferential E C L Trans lator U 11 O N  S em ic onduc torF uture 1 $    3.392 $   3.392 $     3.392 $        3 .3 9 2 S O ­8 11 C D A 1505 D elay  Line, 1.5nS , 50 ohm , F ix ed, H igh­S peed, S urfac e M ountD L1 E LM E C E lm ic 1 $    6.360 $   6.360 $     6.350 $     6.350 S O L­8 12 C D A 2005 D elay  Line, 2.0nS , 50 ohm , F ix ed, H igh­S peedD L2 E LM E C E lm ic 1 $    8.350 $   8.350 $     8.350 $     8.350 S O L­8 13 E XC ­M L20A 390U S urfac e M ount B ead C ore L1 P anas onic D igik ey 2 $    0.270 $   0.540 $     0.130 $     0.260 805 14 B A V 74ZX D ual D iode w / c om m on c athode D 1 ZE TE X D igik ey 1 $    0.195 $   0.195 $     0.117 $     0.117 S O T­23 15 F M M T5179C T R F  Trans is tor Q 1 ZE TE X D igik ey 1 $    0.405 $   0.405 $     0.162 $     0.162 S O T­23 16 E R J­6E N F 10.0K V R es is tor, 10.0K  ohm  1%  0805 1/10WR 1,11,16 P anas onic D igik ey 3 $    0.007 $   0.021 $     0.007 $     0.021 805 17 E R J­6E N F 200V R es is tor, 200 ohm  1%  0805 1/10W R 2­4 P anas onic D igik ey 3 $    0.007 $   0.021 $     0.007 $     0.021 805 18 E R J­6E N F 10.0V R es is tor, 10.0 ohm  1%  0805 1/10W R 5,27 P anas onic D igik ey 2 $    0.007 $   0.014 $     0.007 $     0.014 805 19 E R J­6E N F 49.9V R es is tor, 49.9 ohm  1%  0805 1/10W R 6,7,9,18­22,29,30P anas onic D igik ey 10 $    0.005 $   0.045 $     0.005 $     0.045 805 20 E R J­6E N F 100V R es is tor, 100 ohm  1%  0805 1/10W R 8 P anas onic D igik ey 1 $    0.007 $   0.007 $     0.007 $     0.007 805 21 E R J­6E N F 1.00K V R es is tor, 1.00K  ohm  1%  0805 1/10WR 10,14 P anas onic D igik ey 2 $    0.007 $   0.014 $     0.007 $     0.014 805 22 E R J­6E N F 7.50K V R es is tor, 7.50K  ohm  1%  0805 1/10WR 12 P anas onic D igik ey 1 $    0.007 $   0.007 $     0.007 $     0.007 805 23 E R J­6E N F 33.2K V R es is tor, 33.2K  ohm  1%  0805 1/10WR 13,15,17,31,32P anas onic D igik ey 5 $    0.007 $   0.035 $     0.007 $     0.035 805 24 E R J­6E N F 150V R es is tor, 150 ohm  1%  0805 1/10W R 23,24 P anas onic D igik ey 2 $    0.007 $   0.014 $     0.007 $     0.014 805 25 E R J­6E N F 300V R es is tor, 300 ohm  1%  0805 1/10W R 25,26 P anas onic D igik ey 2 $    0.007 $   0.014 $     0.007 $     0.014 805 26 E R J­6E N F 1.50K V R es is tor, 1.50K  ohm  1%  0805 1/10WR 28 P anas onic D igik ey 1 $    0.007 $   0.007 $     0.007 $     0.007 805 27 E R J­6E N F 110K V R es is tor, 110K  ohm  1%  0805 1/10W R 33 P anas onic D igik ey 1 $    0.007 $   0.007 $     0.007 $     0.007 805 28 E R J­6E N F 25.5K V R es is tor, 25.5K  ohm  1%  0805 1/10WR 34 P anas onic D igik ey 1 $    0.007 $   0.007 $     0.007 $     0.007 805 29 E R J­6E N F 49.9K V R es is tor, 49.9K  ohm  1%  0805 1/10WR 36 P anas onic D igik ey 1 $    0.007 $   0.007 $     0.007 $     0.007 805 30 E R J­6E N F 681K V R es is tor, 681K  ohm  1%  0805 1/10W R 37 P anas onic D igik ey 1 $    0.007 $   0.007 $     0.007 $     0.007 805 31 E R J­6E N F 20.5K V R es is tor, 20.5K  ohm  1%  0805 1/10WR 38 P anas onic D igik ey 1 $    0.007 $   0.007 $     0.007 $     0.007 805 32 E C J­2V C 2A 100D C apac itor, 10pF  + /­0.5pF  0805 100V  C 1 P anas onic D igik ey 1 $    0.066 $   0.066 $     0.066 $     0.066 805 33 E C U ­V 1H 750JC G C apac itor, 75pF  5%  0805 50V C 2 P anas onic D igik ey 1 $    0.020 $   0.020 $     0.020 $     0.020 805 34 E C U ­V 1H 102JC X C apac itor, 1000pF  5%  0805 50V C 3 P anas onic D igik ey 1 $    0.043 $   0.043 $     0.043 $     0.043 805 35 E C U ­V 1H 562K B G C apac itor, 5600pF  10%  0805 50V C 4 P anas onic D igik ey 1 $    0.021 $   0.021 $     0.021 $     0.021 805 36 E C J­2Y B 1H 104K C apac itor, 0.1uF  10%  0805 25V C 5­27 P anas onic D igik ey 23 $    0.061 $   1.403 $     0.061 $     1.403 805 37 E C J­2Y B 1A 105K C apac itor, 1uF  10%  0805 10V C 28­30 P anas onic D igik ey 3 $    0.188 $   0.564 $     0.188 $     0.564 805 38 E C S ­T1C X106R C apac itor, 10uF  16V  Tantalum  C hip E IA  BC 31­34 P anas onic D igik ey 4 $    0.238 $   0.952 $     0.142 $     0.568 E IA ­B 39 334­10­118­00­050 Interc onnec t, S ingle R ow , 0.331 H ightJ10 M ill­M ax M ill­M ax 1 $    1.500 $   1.500 $     1.500 $     1.500 40 P C B 4 lay er, 1.2" x  2.0" nre: $100/lay er V ik tron­Lik a 1 $    2.000 $   2.000 $     0.770 $     0.770

additional 2 lay ers 1 $    0.500 $   0.500 $     0.280 $     0.280

41 B oard S tuffing B udgetary  Q uote C irTran 1 $  11.080 $  11.080 $     6.550 $     6.550

C om plete B oard: Total: $   83.93 Total: $     70.62

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CFD Budget

Total(500) 

per board 500 Total(3000) 

per board 3000

Com ponents $      70.35 $  35,173.20 $       63.02 $     189,048.60 Fabrication $        2.50 $    1,250.00 $        1.05 $        3,150.00 S tuffing $      11.08 $    5,540.00 $        6.55 $       19,650.00 Tota l: $      83.93 41,963.20 $       70.62 $     211,848.60

Total for 3500: 253,811.80

Total budgeted in 

W B S  for 3500: 241,500.00 Total in W B S : $308,200.00 A vailable for 

engineering,  R& D, tes t board  m anufac turing, 

and testing: $54,388.20

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