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PX5-HPGe DPP, MCA and Power Supply for HPGe Detectors & Preamps


The PX5-HPGe is a modified version of Amptek’s MCA and Power Supply PX5 signal processor and power supply. A custom power supply board is installed in a standard PX5, providing the higher bias voltages needed by an HPGe detector along with the higher preamp power voltages and currents required by most HPGe preamplifiers. A custom front panel is installed, which mates with industry-standard connectors on HPGe detector/ preamp modules. The signal processing circuitry is unchanged from a standard PX5.

Our PX5-HPGe combines a high performance digital pulse processor with the power supplies needed for standard cryogenic HPGe detectors. It replaces a conventional shaping amplifier and multichannel analyzer, providing very high performance signal processing in a single compact, low power module, replacing multiple bulky NIM modules in a traditional solution. The digital signal processing provides several advantages over analog solutions: lower electronic noise, reduced ballistic deficit, higher throughput, enhanced stability, and more configuration options to better optimize the system for particular applications. It supports USB, Ethernet, and RS-232 communications protocols and has numerous auxiliary I/O options (MCS mode, List Mode, 8 SCAs, a gate input for Compton suppression, etc).

The PX5-HPGe PWR board provides a bias voltage up to ±5 kV, with a hardware plug to change polarity. It includes an HV inhibit line (to turn off the HV supply if the detector is too warm). The PX5-HPGe PWR board also provides low voltages of ±12 VDC and ±24 VDC, at 80 and 40 mA respectively, using a standard 9 pin preamp power connector.

The PX5-HPGe is compatible with both 32 and 64 bit operating systems, including Windows 10, and features direct integration with the optional Gamma-W gamma-ray analysis software for HPGe Detectors.


  • Includes digital pulse shaping amplifier, MCA, and power supplies
  • Compatible with standard HPGe detectors
  • Trapezoidal shaping with wide range of peaking times to optimize performance
  • High count rate capability with excellent baseline stability, throughput, and pile-up rejection
  • Up to 8k output MCA channels
  • Oscilloscope mode – DAC output for pulse monitoring and adjustment

Block Diagram of PX5-HPGe Connected to High-Purity Germanium Detector and Preamp

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  • Specifications +

    HV Bias

    Voltage 100 to 5,000 VDC
    Polarity ±, selected by hardware jumper
    Current 20 µA
    HV Inhibit Active High or Low, set by internal switch

    Preamplifier Power

    ± 12 VDC ±10%, 80 mA (max)
    ± 24 VDC ±10%, 40 mA (max)


    +5 V +5 VDC at 220 mA (1.1 W) typical
    Input Range +4.5 to +5.5 VDC
  • Application Specrta +

    Spectra of Low-Intensity Material Obtained with HPGe Detector and PX5-HPGe
    Spectra of Lab Radioisotopes Obtained with PX5-HPGe and High-Purity Germanium Detector
  • Documentation +