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International Radiation Detectors, Inc.

PA100

Description

The PA100 is a photodiode amplifier used to counteract the effects of attenuating signal cables on small signals generated from phtotdiodes. The PA100 accomplishes this function by isolating the detected photodiode signal from the line inductance and caspacitance typical of coaxial signal cables. This isolation function allows very small photodiode signals (on the order of 10 fC) to be transmitted several feet over 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 50V 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.
  • High-speed detector response

Specifications

Parameter Conditions Minimum Typical Maximum Units
Detector Capacitance As attached to PA100 - - 500 nF
Detector dark current leakage As attached to PA100 - - 1 µA
Detector Bias Voltage As attached to PA100 0 - 50 V
Minimum Charge Detection Limit As attached to PA100 7 10 20 fC
Risetime Gain = 5000 25 µs
Maximum Pulse Width As attached to PA100 - - 62 ms
Noise Figure All bands 16 64 nV/(Hz)^(1/2)
Test Capacitor Integral to PA100 9 10 11 pF
Peak output Saturation distortion 4 V
Power Supply Dual +/- 6 +/- 12 +/- 17 V