CSPA1X_20210623
Page
2
FAST ComTec GmbH, Grünwalder Weg 28a, 82041 Oberhaching, phone: 49-(0)89 665180 -0, fax: 49-(0)89 665180 40,
CSPA1X charge sensitive preamplifier
Specification
Preamplification channels:
1
Equivalent noise charge (ENC)*:
ENC RMS:
200 electrons, 0.03 femtoCoul.
Equivalent noise in silicon:
1.7 keV (FWHM)
Equivalent noise in CdZnTe:
2.4 keV (FWHM)
ENC slope:
4 electrons RMS /pF
Gain:
see table 1
Rise time**:
7 ns (see table 1)
Decay time constant:
140 μs (150 μs, 50 μs, 50 μs resp.)
Unsaturated output swing:
-3 to +3 volts
Maximum charge detectable per event:
(see table 1)
Power supply voltage (Vs):
+12 volts nominal
Power supply current:
< 30 mA
Power dissipation:
< 400 mW
Operating temperature:
-40 to +85
°
C
Output offset:
+0.2 to -0.2 volts
Output impedance:
1 or 50 ohms, set by jumper
Physical:
Net weight: 195 g (320 g including power supply)
Size without connectors: 113 mm x 70 mm x 24 mm
Size with connectors: 153 mm x 70 mm x 24 mm
* Measured with input unconnected, using Gaussian
shaping amplifier with time constant =1 μs. With a detector
attached to the input, noise from the detector capacitance,
leakage current, and dielectric losses will add to this figure.
** Pulse rise time (defined as the time to attain 90% of maximum
value) has a linear relationship with input capacitance.
Value cited in the table assumes zero added input capacitance.
Tocalculate pulse rise time for practical situations,
use the equation: t
r
=0.4 Cd + 7 ns, where t
r
is the pulse rise
time in ns, and C
d
is the added capacitance (e.g. detector
capacitance) in pF.
Keep in mind that others factors within the detection system
may further limit this value.
Table 1: Sensitivity Versions
Preamp model Gain (mV
/picoCoulomb)
Max. detect.
Pulse (e
-
)
equiv. noise in
silicon keV
(FWHM)
CSPA10 1400 10
7
1.7 keV
CSPA11 150 10
8
6.0 keV
CSPA12 15 10
9
65 keV
CSPA13 1.5 10
10
230 keV
Table 2: model specifications (noise, risetime)
Preamp model noise (ENC)
e
-
(RMS)
*
noise (ENC)
slope e
-
/pF
rise time
(C
d
=0pF)
rise time slope
CSPA10 200 e
-
4 e
-
/pF 7 ns 0.4 ns/pF
CSPA11 630 e
-
3.7 e
-
/pF 3 ns 0.25 ns/pF
CSPA12 6,800 e
-
28 e
-
/pF 6 ns 0.25 ns/pF
CSPA13 24,000 e
-
27 e
-
/pF 20 ns 0.25 ns/pF
Table 3: input / High voltage connectors
model
Input
Connectors input / HV
CSPA1X-2S 2 kV / 10 nF SHV / SHV
CSPA1X-4S 4 kV / 4.7 nF SHV / SHV
CSPA1X-1B 1 kV / 10 nF BNC / BNC
CSPA1X-1BS 1 kV / 10 nF BNC / SHV
Table 4: ordering information
Model No.
Description
Order No.
CSPA10-2S Charge-sensitive preamp, SHV, 2kV/10nF, 1.4 V/pC CSPA102S
CSPA11-2S Charge-sensitive preamp, SHV, 2 kV/10 nF, 150 mV/pC CSPA112S
CSPA12-2S Charge-sensitive preamp, SHV, 2kV/10nF, 15 mV/pC CSPA122S
CSPA13-2S Charge-sensitive preamp, SHV, 2 kV/10 nF, 1.5 mV/pC CSPA132S
CSPA10-4S Charge-sensitive preamp, SHV, 4kV/4.7nF, 1.4 V/pC CSPA104S
CSPA11-4S Charge-sensitive preamp, SHV, 4 kV/10 nF, 150 mV/pC CSPA114S
CSPA12-4S Charge-sensitive preamp, SHV, 4kV/4.7nF, 15 mV/pC CSPA124S
CSPA13-4S Charge-sensitive preamp, SHV, 4 kV/10 nF, 1.5 mV/pC CSPA134S
CSPA10-1B Charge-sensitive preamp, BNC, 1 kV/10 nF, 1.4 V/pC CSPA101B
CSPA11-1B Charge-sensitive preamp, BNC, 1 kV/10 nF, 150 mV/pC CSPA111B
CSPA12-1B Charge-sensitive preamp, BNC, 1 kV/10 nF, 15 mV/pC CSPA121B
CSPA13-1B Charge-sensitive preamp, BNC, 1 kV/10 nF, 1.5 mV/pC CSPA131B
CSPA10-1BS Charge-sensitive preamp, BNC/SHV, 1kV/10nF,1.4 V/pC CSPA101BS
CSPA11-1BS Charge-sensitive preamp, BNC/SHV,1kV/10nF,150mV/pC CSPA111BS
CSPA12-1BS Charge-sensitive preamp, BNC/SHV, 1 kV/10nF,15mV/pC CSPA121BS
CSPA13-1BS Charge-sensitive preamp, BNC/SHV, 1kV/10nF,1.5mV/pC CSPA131BS
Front view:
Input Test in
Back view:
Power Supply Output HV input