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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