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　　Pixie4

Four-channel 75 MHz PXI Digital Processor

　　FEATURES

•  Four channel 14 bit, 75 MSPS pulse processor.

•  32K MCA spectrum per channel.

•  Waveform capture and Pulse Shape Analysis.

•  Sophisticated pile-up inspection.

•  Front and back panel digital I/O signals.

•  Customizable GUI and DSP.

　　OVERVIEW

　　The Pixie-4 is a 4-channel all digital pulse processor on a single 3U CompactPCI/PXI card. It has been designed for fast high-precision coincidence gamma-ray spectroscopy using HPGe detectors. It is well suited to work with 4-fold Clover detectors and with a large variety of other radiation detectors such as scintillators and silicon detectors. The Pixie-4 not only offers waveform acquision but also high precision pulse height measurements and time stamping for event reconstruction.

　　Incoming signals are digitized at a rate of 75 MSPS with a 14-bit ADC. The digital data stream is used for triggering, pile-up inspection and filtering in real time. Waveforms with 13.3 ns sampling intervals and up to 13 μs in length can be stored in an on-board FIFO. Pulse height reconstruction, accumulation of a 32K MCA spectrum for each channel, and optional pulse shape analysis are performed on an event-by-event basis by a digital signal processor and a FPGA. Waveforms and spectra can be read out through the PCI data interface at rates of ~100 MBytes/s.