hpd backplane read-out
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HPD Backplane read-outHPD Backplane read-out
Cdet=400pF
Q=320 fC
tr =20ns
Rate frame 300ns
tr
Q
Bari 15/01/07
tframe rate
The detector+amplifier can be approximately represented by a two dominant pole system.
The first pole is located at: flow=1/ 2Rin Cdet (for Cdet=400 pF and Rin=20 Ohm, flow= 20 Mhz)
The second one is introduced by the amplifier and must be enough spaced from the first one in order to avoid ringing.
The following closed loop situations arise:
Open loop poles
Closed loop polesBari 15/01/07
In
U1
U2
Rf
Out
gm
Ipol
Rc
R1
R2
R3
R4
Cf
Cdet
Bari 15/01/07
IN DETECTOR
OUT-
Rin1Meg
OUT+C2100n
0
Ctest10p
R18
68
R19
68
0
Cin
1n
J1
J309
J2
J309
J3
J309U1 MAX4304/MXM
+3
-2
V+7
V-4
OUT6
U2
MAX4304/MXM+
3
-2
V+7
V-4
OUT6
Q2MMBTH81
0
R1785
0
R62.2k
R14
7750
CA210u
0
C4100n
Q1MMBTH81
R103.5k
C5100nR4
470
0
C1100n
U4MAX4105/MXM
+3
-2
V+7
V-4
OUT6
J4
J201
U3MAX4105/MXM
+3
-2
V+7
V-4
OUT6
R114.7k
0
C3100n
0
R12100
R13800
R15
100R16700
R81.8k
0
CA410u
0
R73300
out
R1100
R33.3k
R210k
R9100
Rf
100k
R51.5k
Cf
3p
CA1100n
CA3100n
0
Cdet390p
INTEST
10%
90%
t1 t2
10%
90%
t1 t2
10%
90%
t1 t2
Current feedback amp., simplified schematicCurrent feedback amp., simplified schematic
Main characteristics of Main characteristics of THS3001
The THS3001 is a high-speed current-feedback operational amplifier, ideal for communication, imaging, and high-quality video applications.
This device offers a very fast 6500-V/µs slew rate, a 420-MHz bandwidth, and 40-ns settling time for large-signal applications requiring excellent transient response.
In addition, the THS3001 operates with a very low distortion of –96 dBc, making it well suited for applications such as wireless communication basestations or ultrafast ADC or DAC buffers.
Bari 15/01/07
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