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HB LED Pulser Boards. By Michael Miller The University of Iowa. HB LED Pulser Boards. - PowerPoint PPT Presentation
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HB LED Pulser Boards
By
Michael Miller
The University of Iowa
HB LED Pulser Boards• HB Pulser board has the same mechanical format as the HB QIE Card.
Pulser is controlled through the CCA (channel control) ASIC via the RBX Serial Bus. There are 2 semi independent pulsers on the board. Output amplitude is between 1.4 & 5.2 V. LED output light profile is similar to the signal from the megatiles. Board provides 5V biasing for up to 6 independent PIN diodes. For the pulse amplitude the “Pedestal DAC” outputs are used.
Vout=5.2V – N*15.3mV• where N is the 8 bit Pedestal DAC setting. Timing for the two LED pulsers is
derived from the “Test Pulse” CCA output. This 25 ns signal can be masked for channels A and B independently and timed to any bunch crossing of the LHC orbit. Two external inputs facilitate pulser testing and make it possible to work without TTC infrastructure.
• There were several minor changes after the first prototype: 2 extra CCA outputs are used to allow individual triggering for Pulser A and Pulser B. Maximum output DAC voltage was changed from 2.55V to 3.9V to increase the dynamic range of the LED signal.
LED Pulser Board Block Diagram
CCA
Bac
kp
lan
e
8 DAC 3.9V
LED Pulser A
LED Pulser B
External trigger A
External trigger B
LED A
LED B Test Pulse B
Test Pulse A
Pedestal DAC A&B
QIE Range 0
QIE Range 1
Pulser Electrical Diagram
V10V 5V 1000Hz
W1
50 Ohm 1.5e-008 s
R1100ohm
R2
50ohm
C1 0.01uF2
3
5
8 U1
MC100EL16
4
Vcc
Vee
Vbb7
6
R3887ohm
R4499ohm
5.5VVCC R5402ohm
R6
1kohm
R7249ohm
5.5VVCC
R8150ohm
R9249ohm
R10150ohm
C2
220pF
R11
10ohm
C3
1000pF
R124.99kohm
R13499ohm
5.5VVCC
Q1NE46134
R1468ohm
R1568ohm
C4
220pF
Q2
MRF5583
5.5VVCC 5.5VVCC
C5
220pF
R161kohm
R174.99kohm
5.5VVCC
Q3NE46134
D1
DIODE_VIRTUAL
R1850ohm
5.5VVCC
LED1
50%
50kOhmKey = a
R19
5.5VVCC
R20
10kohm
Q4FMMT491
C60.1uF
5.5VVCC
R21
1kohm
Q5FMMT491
5.5VVCC
C70.1uF
R22100ohm
C81uF
C90.1uF
A1AD558
+
-
D0 D1 D2 D3 D4 D5 D6 D7
VDAC
LSB
LSB+1
LSB+2
LSB+3
LSB+4
LSB+5
LSB+6
MSB
Chip Select
Chip Enable
DAC Out
DAC Out
Divider Out
LED Connection
Copper tube shield, connected to the cable braid
(not grounded)
Copper tube shield, connected to the cable braid
(not grounded)
HB LED Pulser Board Prototype
LED Pulser Signal at Different DAC Settings(measured with a PMT and an optical filter)
-0.35
-0.3
-0.25
-0.2
-0.15
-0.1
-0.05
0
1.0E-07 1.5E-07 2.0E-07 2.5E-07 3.0E-07 3.5E-07
Time (s)
Vo
lta
ge
(a
t 50
oh
m)
Ped000
Ped064
Ped128
Ped192
Ped224
Ped240
Ped255
HB LED Pulser Board Prototype output signal integral
profile at different amplitudes LED Pulser Signal Integral
0%
20%
40%
60%
80%
100%
1.0E-07 1.5E-07 2.0E-07 2.5E-07 3.0E-07 3.5E-07 4.0E-07
Time (s)
Sig
nal
In
teg
ral
Ped000
Ped064
Ped128
Ped192
Ped224
Ped240
Ped255
LED Pulser Board prototype output signal dynamic range.
HB LED Pulser Board prototype LED signal integral for different pulse voltages (measured with a PMT)
1.E-13
1.E-12
1.E-11
1.E-10
1.E-09
0 1 2 3 4 5 6
Pulse Voltage (V)
Sig
nal
In
teg
ral
(C)
Charge
HB LED Pulser Boards Production
• Design, manufacture, quality control and delivery done by The University of Iowa.
• 30 LED Pulser Boards delivered to FNAL ASAP, on August 2004.
• 110 LED Pulser Boards were tested at the University of Iowa and delivered to FNAL in Sept. 2004.
• The Pulser Boards are o.k. and give enough signal.
HB LED Pulser Boards Production