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Elli29 PCI Pattern Generator

Elli29 PCI Pattern Generator

Elli29 PCI. SEM Pattern Generator
Fig. 1. Elli29 PCI Pattern Generator

The Elli29 PCI is a perfected model of our previous pattern generators. As its predecessors, Elli29 is an advanced data acquisition product with high speed Digital-to-Analog addressing capabilities and Analog-to-Digital sample conversion in conjunction with improved noise-immunity.

Pattern Generator solutions include:

  • Digital board for PCI bus slot inside the PC  
  • Analog desktop unit with its own stabilized power supply  
  • 2 meter fiber optic cable  
  • Set of signal cables  
  • Power cord  
  • Software Drivers

Analog unit is connected to Digital board by fiber optic cable to perform galvanic decoupling from PC and to provide high speed noise protective data transfer.

Pattern Generator boards carry:

  • Two 16-bit Digital-to- Analog Converters (DACs) (60ns Settling Time)
  • One 8-bit Analog-to- Digital Converter (ADC)
  • Beam Blanker On/Off switch (TTL output level)
  • Internal/External scan mode switch (TTL output level)

Output XY DACs and input ADC voltages can be tuned for arbitrary intervals in ±10.0 V range.

Time characteristics of the Pattern Generator depend on Exposure / Image Acquisition modes:

  • Minimal exposure dwell time (period of XY DACs addressing) 0.15 us
  • Minimal Image Acquisition time (period of XY DACs addressing + getting ADC signal) 1.0 us
  • Dwell time step (accuracy of dwell time increasing) due to empty loop of PC depends on processor frequency. For example, if processor frequency is 1000 MHz then dwell time step is near 2 ns
  • Minimal exposure dwell time in BeamOutAfterPoint mode (time between BlankOff - BlankOn addressing) 0.4 us
  • On-Board Image Accumulation (per Accumulation cycle) 0.12 us
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