16 ch Programmable Spectroscopy Amplifier and 16 ch CFD
- 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: 200 – 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, 1, 2 and 4 µs (up to 16 µs for N1068GE)
- Programmable fast unipolar input mode for PMT and all fast charge detectors
- 8 step coarse gain and 7-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
The N1068 is a 16 channel Programmable Spectroscopy Amplifier with Time Filter, 30% Constant Fraction Discriminator (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.
The first stage 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 4 different time constants (0.5, 1, 2, 4 µs; 1, 4, 8, 16 µs for N1068GE), pole-zero compensation, a 8-step coarse gain (2, 4, 8, 16, 32, 64, 128, 256), a 7-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 (Constant Fraction = 30%). 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) input version
The N1068 is supported by freely downloadable CAEN-CSA software, available for both Windows and Linux OS.
One unit wide NIM unit
Positive or negative pulses, max. amplitude of ±4V,
50 Ohm impedance (SE), 110 Ohm (Differential);
Input polarity must be set via terminal
Unipolar/gaussian signal, further 10x fixed amplification of the OUT value, with a dynamic range of 0 ÷ ±8 V max (on 1 MOhm),50 Ohm output impedance;
common offset adjust (-200 ÷ +200 mV) 8-bit resolution
Unipolar/gaussian signal with a dynamic range of 0 ÷ ±8 V max (on 1 MOhm),
50Ohm output impedance;
common offset adjust (-200 ÷ +200 mV) 8-bit resolution
- CFD OUT
Diff. ECL output, width 65÷1430 ns ±5%, 5 bit adjustable
Output, on LEMO connector and on double row connector:
- options: energy, timing, disabled; 0 ÷ ±8V max (on 1 MOhm)
- 50 Ohm output impedance
- high impedance when disabled
- MUX CFD
CFD out of channel with MUX enabled. Standard NIM output on double row connector
Multiplicity output: analog sum of CFD OUT, -2 mA current output per hit; -100 mV on 50 Ohm
- MUL DISC
Standard NIM output on double row connector
Multiplicity Trigger Discriminator (Time over threshold) with Programmable Threshold
- Integral non linearity
<± 0.02% in 10%÷90% of the full scale @ Gain=45 and 0.5 μs shaping time (<± 0.3% typ. for any shaping time)
Logical OR of the CFD Output, on LEMO connector, standard NIM output, width 140÷1500 ns ±5%, 5 bit adjustable. Individually Enable
- Temperature stability [0÷50°C]
Gain: < 70 ppm/°C. DC level Output: < 10 μV/°C
- Equivalent Input Noise
< 15 μV RMS (Gain=100, 4 μs shaping time)
- Interchannel Crosstalk
<-55 dB at max Gain, 4μs shaping time and 4 V input on adjacent channel
- Coarse Gain Range
- Shaping Time
(0.5, 1, 2, 4) μs; 0.5μs with fast unipolar input select (0.5F).
GE version: (1, 4, 8, 16) μs; 1μs with fast unipolar input select (1F)
- Fine Gain Range
From 1 to 2 , 7-bit adjustable
- Pole- zero Adjustment
Done via software on 256 steps to match preamp tails in the 20 to 2000 μs range
- Timing Filter time constant
Diff. (100, 500ns), Int. (20, 80ns)
- Timing Gain
Adjustable 1, 4
- CFD Threshold
0 ÷ 2048 mV (12-bit resolution)
- CFD Delay Time
Selectable by jumper (5 steps): 8ns, 16ns, 24ns, 32ns, 40ns
- CFD WALK
<±500 ps on 60 mV ÷ 2V input with 10 ns rise time, 50 μs duration
- Delay on CFD ECL Output
18÷1380 ns ±5%, 5 bit adjustable. Individually Enable
- Pile-up rejection
Individually selectable; when a pile-up event occurs an output saturation is forced
USB: USB B type female connector; USB 2.0 compliant
ETH: 10/100 Base-T female connector; TTL signals (TCP/IP)
RS485 on 10+10 pin header General I/O
16 ch Programmable Spectroscopy Amplifier and 16 ch CFDProduct page
|Name||File extension||File size||Revision||Last update||OS||OS Version|
|DT55xxE - DT547x - DT/R/N14xxET - NDT14xx - N1570 - N568E - N1068 Win 32/64bit USB Driver||ZIP||6.96 kB||2.2||08/01/2018||Windows||
x64 10 |
|DT55xxE - DT/R/N14xxET - NDT14xx - N1570 - N568E - N1068 Linux 32/64bit USB Driver||TXT||3.87 kB||2.0||28/09/2018||Linux||
|Name||File extension||File size||Revision||Last update|
|N1068 - 16 Ch Programmable Spectroscopy Amplifier and CFD (May 2016)||1.80 MB||8||20/10/2017|
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|CAEN-CSA||Spectroscopy Amplifier Control Software|
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