MPRS-16(Data sheet V1.4_01)

16 – fold preamplifier +shaper with timing filterand discriminatormesytec MPRS-16 includes 16 channels of charge sensitive preamplifiers, shapers, timing
filter amplifiers and leading edge discriminators. It provides two timing filter outputs,
where each is the sum of 8 channels. It also provides a NIM trigger output which is theored signal of the discriminators. It is well suited for high resolution timing and ADC gate
generation. The input polarity and sensitivity can be selected in 8 steps by a rotary switch.
The shaper outputs are designed to connect directly to standard peaksensing ADCs. The
modules are especially well suited for single or double sided multistrip silicon detectors.
Features:• 16 channel compact module• Includes: preamplifier, shaper, timing filter• High quality discriminator output (NIM) forgood timing resolution or data acquisition
start, adjustable threshold.
• Sensitivity and polarity selectable with rotaryswitch in steps: 0.065, 0.1, 0.15, 0.2, 0.3,0.5, 0.75, 1.0 * full range.
• Shaper output 10 V @ 1 kΩ, 1 us FWHM
• Pulser input• Bias voltage up to ± 400 V• Preamplifier input protection• PCB module available for vacuum use
Schematics:

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
info@mesytec.com - www.mesytec.com

MPRS-16

Mutichannel
preamplifier shaper

Technical DataInput stage• Input connector(s): Sub-D 25 female connector• Pin assignment:
Function connector
Sig-gnd
1,2,7,12,13,14,15,25
Cha 1
11
Cha 223
Cha 310
Cha 422
Cha 59Cha 621
Cha 78Cha 820Function
Cha 9connector
19

Cha 10Cha 11
Cha 12
Cha 13
Cha 14Cha 15Cha 16guardring

618
517416324• Positive and negative charge can be amplifiedequally.
• The guardring output (24) is connected via
R-C-R filter (100 kΩ, 10 nF, 100 kΩ) to thecommon detector bias input.
Noise• For 50 MeV full range type (min 15 mVrms)• 7.0 keV Si + 0.085 keV/ pF• maximum input capacity: 1000 pF(detector + cable)• For 150 MeV full range type (min 15 mVrms)• 10 keV Si + 0.10 keV/ pF• maximum input capacity: 1000 pF(detector + cable)
Pulser input• Tail pulse, or square pulse, internally notterminated:• Charge injection per channel:• 50 MeV – type: 15 MeV/ V• 150 MeV – type: 25 MeV/ VSensitivity• Sensitivity can be changed by a rotaryswitch.

The following max ranges (8 V output at theshaper module) can be set: 0.065, 0.1, 0.15,0.2, 0.3, 0.5, 0.75, 1.0 * full range.

• Pin assignment of 34 pole output connector:• pin 1 channel 1, pin 3 channel 2…..
• pin 2,4,...32, 33, 34 output ground• Option: low power output stage (max 4 V output signal). Is useful for in vacuum use.
Timing Filter Outputs

The MPRS provides two timing filter outputs.
The signals are generated from the sum of channel
1..8 and 9..16. The signals are negative and arescaled and polarized with the rotary switch setting. Output amplitudes : -1.5 V for maximum
range in a single channel. The amplitude willvary to some extent with detector capacity andsignal risetime.
Discriminators

The MPRS provides a NIM trigger output, whichis the ored sum of its 4 leading edge discriminators, working each on the analog timing sum of 4channels. Multiple discriminators are used toprovide a high quality low jitter NIM signal. The
discriminators have a common threshold, which
can be adjusted via 10- turn potentiometer. Thethreshold value is available at the sense output.
Example:-1 V threshold voltage in the 25 MeV range
means 10 % which corresponds to 2.5 MeV
threshold value.
Note that a pulser applied on all channels (for example when applied to the pulser input) will add
up in a group of 4 channels, so a pulser corresponding to 0.65 MeV will pass the 2.5 MeV
threshold and creates triggers !!
Detector bias input• Lemo connector• Maximum voltage 400 V• When detector side must be on ground level:terminate bias input with 50 
Ground connections• Ground screws on rear sideShaper Outputs• Unipolar positive gaussean pulse (CR(RC) 5 ).

Output amplitude: 0 to 10 V, max 50 mA• Peaking time 790 ns. FWHM 950 ns.
• Crosstalk < 3 * 10-3 (-50 dB) to neighbour
channel, less than -70 dB to others.
mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30, fax: +49 - 89 / 456007-39
info@mesytec.com - www.mesytec.com

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Mutichannel
preamplifier shaper

MPRS-16
Power SupplyConnector• Sub-D 9 connector: 1, 2 = gnd, 3 = +6 V,
4 = +12 V, 5 = -6 V

upper trace: timing output,
lower trace: NIM trigger output

Power consumtion• With 10 V output driver = 2.0 W• +12 V 60 mA• + 6 V 220 mA• - 6 V - 90 mA•

With 4 V output driver = 1.0 W• + 6 V 140 mA• - 6 V -20 mA

Due to the low power consumption cooling is notnecessary.
Dimensions• Length: 173 mm (without connectors)• Width: 105 mm• Height: 46 mm
Output signals

Upper trace (CH1): shaper output,
lower trace (CH2): NIM trigger output, terminatedwith 50 Ω.

T = 100 ns, CH1 = 0.5 V, CH2 = 0.5 V

upper trace: shaper signal output,
lower trace: NIM trigger output.
Peaking time: from NIM signal to shaper
peak 790 ns

T = 200 ns, CH1 = 5 V, CH2 = 0.5 V
T = 500 ns, Ch1 = 2 V, CH2 = 0.5 V

Updated 1.3.2005, power consumption, output signals, scem.
mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30, fax: +49 - 89 / 456007-39info@mesytec.com - www.mesytec.com

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