MPR-1(Data sheet V1.3_01)

Single channel charge sensitive
preamplifier with two outputs

mesytec MPR-1 is a charge integrating preamplifier module. It provides two outputs
which can be jumpered to different or same polarity. One can be configured as timing filter
output. Both can drive terminated BNC cables. The sensitivity can be changed by a factorof 5 via front panel switch. This helps to get larger signals at low charge deposition.
MPR-1 is available with Lemo, BNC, MHV and SHV connectors.

Features:•••••••••••

Ni-plated, fully shielded case
ESD input protection
Positive and negative input charge
Pulser input
Bias voltage up to ±3000 V
Two outputs (selectable polarity, one canbe configured as timing filter output)
Strong output driver for 50 Ω(optional 93 Ω) termination
Fast risetime (t < 12 ns)
Two sensitives (switch selectable)
Low power

Shematics:

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

MPR-1single channel preamp

Technical Data
Different standard ranges are available
Range in energy deposition in silicon detectors.
Divide by 3.6 to get number of electrons (1 GeV = 2.8*108 electrons)
All values for ±8 V output, left number for switch position low sensitivity, right number for high sensitivity.
• 200 MeV type: 200 MeV / 40 MeV• 1 GeV type: 1 GeV / 200 MeV→ low noise (for energies up to 200 MeV [Si] = 9 pC)→ Si detectors in heavy ion experiments or PMTs
(for energies up to 1 GeV = 45 pC)

Other ranges on request.
PreamplifierOutput stage• ESD protected• Positive and negative charge can beamplified equally.
• Open loop gain typ 60000 @ 1 pF
integration capacity• Temperature drift < ±50 ppm /°C• Nonlinearity < 50 ppm• Energy rate capacity at 200 MeV:
2*106 MeV /s, at switch 40 MeV:
4*105 MeV /s.
Risetime of energy and timing output.

• Positive and negative output for single ordifferential use. Internal switchable:same polarity, or one output
with timing filter.
• The timing filter is a single differentiation withtime constant  = 33 ns.
• Output swing: 0 to ±8 V (not terminated)• Decay time TD = 100 us

Detector +cable capacity

Signal risetime

0 pF

12 ns

100 pF

25 ns

330 pF

50 ns

Internal Jumper setting

setting for output 1 and 2

Pulser input• Tail pulse, rise-time TR = 0...100 ns,
decay time typ. 500 us• Terminated with 50 Ω
• Amplitude: max. 10 V
• For 200 MeV type: 1 V corresponds to acharge injection of 10-12 °C or 22 MeV [Si]• For 1 GeV type: 1 V corresponds to
4.7*10-12 °C or 100 MeV.
Example: for 200 MeV type,switch to 200 MeV: 1 V pulser input will resultin 0.8 V output voltage.

Input capacity• The preamplifier can handle capacities of morethan 1000 pF• Preamp input capacity typ. 10 nF
Detector bias (Bias Network):• Maximum: ±3000 V• Bias filter: T-filter (RCR) with 10 MΩ frombias input, 4.7 nF filter capacitor to ground,
50 MΩ resistor to detector input.
• (others on request)

mesytec GmbH & Co. KGWernher-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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MPR-1single channel preamp

Input side

(Lemo, BNC, MHV or SHV connectors)• 200 MeV typefor 1 us shaping time (= 2.3 us FWHM):
N = 2.3 keV + 0.021 keV /pF

Detector
Input

Bias Input
3000 V max.
(BNC, Lemo: ±400 V)

PulserInput

Detector+ cablecapacity

Noise[FWHM] 1 usshaping time

0.35 usshaping time

0 pF

2.3 keV

2.7 keV

50 pF

3.5 keV

4.7 keV

100 pF

4.1 keV

5.9 keV

330 pF

9.1 keV

15 keV• 1 GeV typeOutput sidePowerDetector+ cable capacity

Noise [FWHM]
1 us shaping time

0 pF

6 keV

50 pF

8.5 keV

100 pF

11 keV200 pF

16 keV400 pF

25 keVPower consumption

Sensitivity
2
1
selectOutputs
Output 1: polarity + or –Output 2: polarity + or –, optional Timing filter
Amplifier noise• Noise vs. Input C and shaping time(idealised amplifier and detector):• +12 V• –12 V

40 mA + output current
30 mA + output current

Power connector

needed plug:
Lemo: FFA.0S.303.CLAC44ZN
Lemo to SubD-9 cable included at delivery
Power cable output connector

C Det= cable + detector capacity, in pF;

SubD-9 connection:
1, 2 = gnd / 4 = +12 V / 9 = –12 V /others not connected

ΔT= shaping time, in us;

Dimensions

N= noise FWHM in keV;

N0

= noise factor at capacity 0;

NS= noise factor slope• 60 mm * 143 mm * 30 mmincluding connectors• Weight: 240 gN=(N 0 +C Det ∗N S )∗√ 1/ ΔT ;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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