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main N1068


16 ch Spectroscopy Amplifier with Time Filter, CFD and pile-up rejection

  • 16 channels is a one unit wide NIM module
  • Differential and Single ended versions available
  • Dedicated version for germanium detectors N1068GE
  • Pile-up rejection facility individually selectable
  • Programmable positive or negative input polarity per each channel
  • ±4 V input dynamics on 50 Ohm (SE) and 110 Ohm (Differential)
  • Active baseline restorer with programmable output offset
  • 16 channels CFD with 5 step delay individually jumper selectable
  • 12 bit programmable delay on ECL CFD output (range: 200ns - 800 ns)
  • Timing filter amplifiers with programmable differentiation and integration time
  • CFD, Energy or Timing filter multiplexed output
  • Multiplicity trigger (NIM) with programmable threshold
  • Programmable 4 shaping time per channel: 0.5 µ, 1 µ, 2 µ and 4 µ (up to 16 µ for N1068GE)
  • Programmable fast unipolar input mode for PMT and all fast charge detectors
  • 8 step coarse gain and 8 bit fine gain for energy amplifier
  • Low Noise
  • Programmable 8 bit pole zero adjustment
  • Completely programmable via USB, Ethernet and RS485: (Thresholds. shaping times, gains, Pole-Zero, etc.
  • OR output and Multiplicity output
  • Low Power
child 1 N1068
The N1068 is a 16 channel Programmable Spectroscopy Amplifier with Time Filter, CFD and pile-up rejection implemented in a single width NIM module. This module is designed to be used with Silicon, Germanium, and many other detectors types connected to charge sensitive preamplifiers. Also adapted for fast unipolar input signal like PMT and all fast charge detectors. Available dedicated version for germanium detectors: N1068GE (Coming Soon)

The first part of the Amplifier circuits is the polarity selector circuit which select the positive or negative input polarity. Follow two different sections which provide the Energy and Timing information.

The Energy section is composed by a Spectroscopy amplifier with CR-RC5 shaping type and four different time constants (0.5, 1, 2, 4 µ, extended up to 16 µ for N1068GE), pole-zero compensation, a 8-step coarse gain (2, 4, 8, 16, 32, 64, 128, 256), a 8-bit fine gain (from 1 to 2) and a DC restorer circuit.

The Timing section is composed by a Timing filter with a differential stage followed by an integration stage both with two time constants. An amplifier stage provides 4 gain value. This timing signal is sent to a Constant Fraction Discriminator section. The CFD has an auto walk compensation and the delay time is selectable individually for each channel by 5 step jumper.

The width and delay of CFD OUT is individually programmable; the delay can be enabled or disabled. The trigger stage foresees a Programmable Multiplicity Trigger and Multiplicity signal, an analog sum output of every channel CFD out; Multiplicity signal can be daisy chained with those provided by other modules. Chaining with a Sum Output available as well.

Pile-up rejection is configurable individually for each channel. When enabled each time a pile-up event occurs, the Energy output is set to the saturation value.

The USB 2.0, Ethernet and RS485 interfaces allow to handle all functional parameters. The board is available in both Single Ended (50 Ohm Impedance) and Differential (110 Ohm impedance) versions.
Block Diagram N1068
software N1068
Spectroscopy Amplifier Control Software
pnt Innovative GUI
pnt Dashboard capability: Allows to manage all the CAEN Spectroscopy Amplifiers
pnt Supports Linux and Windows
pnt Handles all the communication links provided by N568E and N1068 Spectroscopy Amplifiers: Ethernet, USB

Spectroscopy Amplifier Control Software is a software tool that allows an easy management of all the functional parameters of the CAEN Spectroscopy Amplifiers N568E and N1068. Module control can take place via either USB or TCP/IP and features an user friendly graphical user interface.

Supported operating systems are Windows and Linux.