BRL Test, Inc.

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PA-7-70 - Judson Technologies Current Amplifiers


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  • Model: PA-7-70
  • Manufactured by: Judson Technologies
  • Bandwidth: 150.00kHz
  • Gain [V/A]: 10^7
  • Input Noise: .04 pA/Hz^1/2
  • Extra Specifications: Current Mode Preamplifier

Current Mode Preamplifiers convert the current output of a photovoltaic Ge, InAs, or InSb detector into a voltage output. They amplify the signal for subsequent use with oscilloscopes, lock-in amplifiers, or A-to-D converters.  Three different preamp models each offer specific advantages, depending on detector type and bandwidth requirements. All units (except multi-channel models) have switch-selectable gain.

The PA-7 is an excellent general purpose preamplifier for most high shunt resistance (RD > 25Kohm) detectors, including small area J16 Series Ge and all J16TE2 Series cooled Ge. It has extremely low current noise and current offset.  For most applications, the PA-7-70 with high gain of 107 V/A offers best performance and versatility. However, for applications where 107 V/A gain is unusable (due to bandwidth or DC saturation), the PA-7-60 or PA-7-50 are suitable alternatives.

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