The DGF Pixie-16 is a 16-channel data acquisition system for nuclear physics and other applications requiring coincident radiation detection with large number of channels. It provides digital spectrometry and waveform acquisition for 16 input signals per module; several modules can be combined into a larger system. The DGF Pixie-16 is based on the CompactPCI/PXI standard which allows data transfer rates from Pixie-16 memory to the host computer of up to 109MByte/s. Commercial PXI/CompactPCI modules - DSP processor boards, HV supplies, embedded host computers - can be added to build a flexible standalone data acquisition and analysis system.
Each channel of the Pixie-16 accepts signals from virtually any radiation detector that has an exponential decay output. Incoming signals are digitized with 12 or 14 or 16-bit, 100 or 250 or 500 MSPS ADCs. Digitally controlled offsets can be individually adjusted for each channel. While the voltage gain is fixed to a factory set value, there are two software selectable attenuation factors as well as jumper selectable 50 Ω input termination. Triggering, pile-up inspection and filtering of the data stream is performed in real time; pulse heights and other event data is calculated on an event-by event basis. Results are stored in 512K of spectrum memory and 128K of list mode FIFO memory.
- 12-16 bit, 100-500 MSPS digitizing of input signal
- 32bit/33MHz PCI interface with module-to-host transfer rates up to 109MB/s
- Simultaneous amplitude measurement and pulse shape analysis for each channel
- Pulse heights measured with up to 16 bits accuracy on each of the four channels
- Waveform acquisition up to 163us for each channel, in 10 or 4 or 2 ns intervals
- 32K x 32bit on-board spectrum memory for each channel
- 128K x 16bit additional on-board FIFO memory for continuous readout of list mode data
- Fixed gain, adjustable input offset, trigger and energy filter parameters