TA2400
2.4GHz Fast Pulse / Timing Preamplifier
User Manual
copyright FAST ComTec GmbH
Grünwalder Weg 28a, D-82041 Oberhaching
Germany
Version 1.0, November 16, 2006
Table of Contents
ComTec GmbH II
Table of Contents
1. Description ............................................................................................................................... 1-1
2. Specifications ........................................................................................................................... 2-1
2.1. Absolute maximum ratings..........................................................................................2-1
2.2. Technical data ............................................................................................................. 2-1
2.3. Power requirements .................................................................................................... 2-1
2.4. Case 2-1
2.5. Accessories.................................................................................................................2-1
Description
ComTec GmbH 1-1
1. Description
The TA2400 is a fast preamplifier with a small signal bandwidth of 2.4 GHz.
A unique feature for such high speed amplifiers is the DC coupling. DC coupling avoids count rate
effects due to non DC balanced pulse trains and the corresponding charging of coupling
capacitors.
Basically the TA2400 is a non inverting, closed loop, voltage mode, operational amplifier design.
A test with a 30 mV
PP
pulse and a FAST ComTec P7889 100 ps TOF analyzer showed an
improvement of 10 … 15% in peak width (FWHM) when a TA1800 (1.8GHz / 20dB / x10) was
used for amplification of the small pulse signal.
Applications for the TA2400 are:
• Pre-amp for ultra fast detectors (MCP, PMT, …)
• Oscilloscope and transient recorder pre-amp
• Photon-/Ion-counting
• Wideband signal processing
Figure 1.1: Principle schematic
Figure 1.2: Output pulseform (30 mV in, 150 mV out)
Specifications
ComTec GmbH 2-1
2. Specifications
2.1. Absolute maximum ratings
Supply: (100 ms max.) ............................................................................ 25V
Signal input: .................................................................................................±2.5 V
ESD rating: .......................................................................................3000 V HBM
...........................................................................................200 V MM
2.2. Technical data
Voltage gain: ..................................................................... non inverting, 14dB / x5
Input connector: ................................................................BNC, 50 Ohm, DC coupled
Output connector: .....................................................BNC, low impedance, DC coupled
......................................................................50 Ohm output feasible
Output voltage: ........................................................................................ max. ±1.3 V
Output current: .................................................................................... max. ±150 mA
Bandwidth: small signal (V
OUT
= 200mV
RMS
) .......................................2400 MHz
full power (V
OUT
= 2VPP) ......................................................875 MHz
Slew rate: (2 V step) .......................................................................... 5500 V/µs
Input offset voltage: ..................................................................................... max. 5.25 mV
.................................................................................... typ. ±20 µV/°C
Input referred noise: ..........................................................................................2.8 nV/√Hz
2.3. Power requirements
Supply connectoer: .............................................................................. 2.1 mm center pin
Supply voltage: .................................................................................nominal +12 V
DC
voltage range: ...........................................................+10 … +18 V
DC
...................................................................... false polarity protection
Supply power: ..................................................................................................2.5 W
2.4. Case
Case material: .......................................... extruded aluminium sheath, Al Mg Si 0.5
Lid material: .......................................................................... die cast, GD-Al Si 12
Size: ......................................................................... 65/101 x 60 x 35 mm
Weight: .................................................................................................. 124 g
2.5. Accessories
• External wall power supply (included)
• L-clips (order no. AB-WL) for wall-/screw-mounting (optional)
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