International Radiation Detectors, Inc.
PA100V Pulse Amplifier
Description
The PA100V amplifier consists of three main components
which are a ceramic board PA100V pre-amp, PA100V control box
and a ceramic transition board which connects pre-amp with
the control box. The pre-amp is a vacuum compatible,
programmable gain amplifier. The gain control and
connections to signal, power etc. of the pre-amp are
provided by the control box which can be mounted directly on
the vacuum system wall. The PA13 sampler board will provide
the power to the whole circuit and also provide a voltage
proportional to the charge developed in the detector.
The pre-amp board can accept AXUV/SXUV 20 and AXUV/SXUV
100 devices. The detectors can be reverse biased up to 12
Volts.
The PA100V is a pulse amplifier used to counteract the
effects of attenuating signal cables on small signals
generated from photodiodes. The PA100V accomplishes this
function by isolating the detected photodiode signal from
the line inductance and capacitance typical of coaxial
signal cables. This isolation function allows very small
photodiode signals (on the order of 10 fC) to be transmitted
over several feet of common 50 ohm coaxial cables without
being corrupted by noise pick-up.
Features
- AC coupled detector bias network for photodiodes with up
to 1µA of dark current at 12V and up to 500 nF
capacitance. Bias network is bipolar.
- Internal power supply filter network.
- Selectable gains of 1,5,10,50,100,500, 1000 and 5000 X. If
requested, the gain can be remotely selected.
- Integral test capacitor to facilitate charge injection
input for calibration.
Specifications
| Parameter |
Conditions |
Minimum |
Typical |
Maximum |
Units |
| Detector Capacitance |
As attached to PA100V |
- |
- |
500 |
nF |
| Detector dark current leakage |
As attached to PA100V
|
-
|
-
|
1
|
µA
|
|
Detector Bias Voltage
|
As attached to PA100V
|
0
|
-
|
12
|
V
|
|
Minimum Charge Detection Limit
|
As attached to PA100V
|
7
|
10
|
20
|
fC
|
|
Risetime
|
Gain = 5000
|
|
25
|
|
µs
|
|
Maximum Pulse Width
|
As attached to PA100V
|
-
|
-
|
62
|
ms
|
|
Noise Figure
|
All bands
|
|
16
|
64
|
nV/(Hz)^(1/2)
|
|
Test Capacitor
|
Integral to PA100V
|
9
|
10
|
11
|
pF
|
|
Peak output
|
Saturation distortion
|
|
4
|
|
V
|
|
Power Supply
|
Dual
|
+/- 10
|
+/- 12
|
+/- 15
|
V
|
|