FAST ComTec TA1000B-x Bedienungsanleitung

TA1000B-x

Fast, Very Low Noise Pulse / Timing Preamplifier

User Manual

copyright FAST ComTec GmbH

Grünwalder Weg 28a, D-82041 Oberhaching

Germany

Version 1.1, Mai 1, 2011

Warranty

ComTec GmbH II

Warranty

Equipment manufactured by FAST ComTec GmbH is warranteed against defects in materials and

workmanship for a period of twelve months from date of shipment, provided that the equipment

has been used in a proper manner as detailed in the instructions manuals. During the warranty

period, repairs or replacement will be made to FAST ComTec's discretion on a return to factory

basis. The transportation costs, including insurance to FAST ComTec is the responsibility of the

customer except for defects discovered within 30 days after receipt of the equipment, where

shiping expense will be paid by FAST ComTec.

D-82041 Oberhaching, Germany

This manual contains proprietary information; no part of it may be reproduced by any means

without prior written permission of FAST ComTec, Grünwalder Weg 28a, D-82041 Oberhaching,

Germany. Tel: ++49 89 66518050, FAX: ++49 89 66518040.

The information in this manual describes the hardware and the software as accurately as

possible, but is subject to change without notice.

FAST ComTec GmbH, Grünwalder Weg 28a, D-82041 Oberhaching, Germany

Tel. +49(0)89-66518050, Geschäftsführer Dr. Wolfgang Wagner,

Handelsregister München HRB 73004

Table of Contents

ComTec GmbH III

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. Diagrams.................................................................................................................2-2

2.4.1. 0 to –400mV falling edge pulse response ....................................................2-2

2.4.2. Max. output broadband noise voltage..........................................................2-4

2.4.3. Simulated frequency response ....................................................................2-7

2.5. Metal case...............................................................................................................2-7

2.6. Accessories.............................................................................................................2-7

2.7. Available options .....................................................................................................2-8

Description

ComTec GmbH 1-1

1. Description

The TA1000B-x comprises a series of fast, very low noise preamplifiers with model dependent

voltage gains of 10, 50, 100 or 200 V/V and corresponding small signal bandwidths of 710, 1000,

950 or 400 MHz respectively.

A unique feature for such high speed amplifiers is DC coupling. DC coupling avoids count rate

effects due to non DC balanced pulse trains and the corresponding charging of coupling

capacitors. This is particularly important when bursts of pulses may occur.

Basically the TA1000B is a non inverting, closed loop, voltage mode, one- or two-stage

operational amplifier design.

Input offset adjustment is provided. The input related adjustment range is approximately >±5 mV.

Each model is available with a bandwidth limited (BWL) option which further reduces the noise

floor.

WARNING: The amplifier has no thermal shutdown. Thus, be careful when connecting the output

to loads less than 50 Ohms (do not shorten the output!).

Type Nominal

Gain

[V/V]

Nominal

Gain

[dB]

Small

Signal

Band-

width

(-3dB)

Gain

Flatness

Peaking

(100ps

Rise Time

Input

Pulse)

Noise

Figure

(100MHz)

Input

Referred

LF Noise

(20Hz ...

1MHz)

(0) (1) (0) (1) (0) (2) (3) (4) (4) (5)

TA1000B-10 10 20dB 710MHz 0.00dB 6% 8dB 51.2µVrms 0.224mVp-p 0.3µVrms

TA1000B-10 BWL(6) 10 20dB 170MHz 0.00dB 0% 30.2µVrms 0.124mVp-p

TA1000B-50 50 34dB 1000MHz 0.22dB 9% 57.8µVrms 0.541mVp-p 0.5µVrms

TA1000B-50 BWL(6) 50 34dB 245MHz 0.00dB 0% 36.6µVrms 0.509mVp-p

TA1000B-100 100 40dB 950MHz 0.12dB 8% 55.9µVrms 0.542mVp-p 12.3µVrms

TA1000B-100 BWL(6) 100 40dB 245MHz 0.00dB 0% 34.2µVrms 0.318mVp-p

TA1000B-200 200 46dB 400MHz 0.00dB 0% 31.2µVrms 0.331mVp-p 13.6µVrms

TA1000B-200 BWL(6) 200 46dB 110MHz 0.00dB 0% 23.1µVrms 0.223mVp-p

Input Referred

Broadband Noise

(DC ... 12.5GHz)

(0) Simulation Results

(1) Signal input: sine wave = 200mVeff / "nominal Gain"

(2) Output Pulse Height approx. 200mVp-p, Input Rise Time 100ps

(3) defined as RMSΔ = σ = standard deviation, ref. scope pictures of output noise voltages below

(4) in 40 minutes accumulated with a 12.5GHz sampling head, ref. scope pictures of output noise voltages below

(5) measured with a HP3455A True RMS Voltmeter, this is mostly the 1/f noise

(6) BWL = Bandwidth limited option (with improved noise performance)

Fig. 1.1: Comparison chart

Description

ComTec GmbH 1-2

Typical applications for the TA2000B are:

 Pre-amp for ultra fast detectors (MCP, PMT, …)

 Oscilloscope and transient recorder pre-amp

 High precision Time-of-Flight

 Photon-/Ion-counting

 Wideband signal processing

Fig. 1.2: TA1000B-10 simplified schematic

Fig. 1.3: TA1000B-50 / -100 / -200 simplified schematic

Specifications

ComTec GmbH 2-1

2. Specifications

2.1. Absolute maximum ratings

Supply: (100 ms max.) ......................................................................... 25V

Signal input: ........................................................................................... 2.5 V

ESD rating: ................................................................................. 23000 V HBM

.......................................................................................200 V MM

2.2. Technical data

Voltage gain: TA1000B-10: .......................................... non inverting, 20dB / x10

TA1000B-50: .......................................... non inverting, 34dB / x50

TA1000B-100: ....................................... non inverting, 40dB / x100

TA1000B-200: ....................................... non inverting, 46dB / x200

Input connector: .............................................................BNC, 50 Ohm, DC coupled

...........................................................AC coupling option available

Output connector: .................................................. BNC, low impedance, DC coupled

...................................................... 50 Ohm output option available

Output voltage: ................................................................................... max. 1.3 V

Output current: ............................................................................... max. 150 mA

Slew rate: TA1000B-10 (2 V step) ..................................................1600 V/µs

TA1000B-10 BWL (2 V step) ............................................530 V/µs

Input offset voltage: ................................................................................ max. 1.5 mV

.............................................................................. typ. 2.0 µV/°C

Input offset adjustment: ........................................................................................ > 5 mV

2.3. Power requirements

Supply connectoer: ...........................................................................2.1 mm center pin

Supply voltage: ............................................................................. nominal +12 VDC

voltage range: ........................................................+10 … +18 VDC

...................................................................false polarity protection

Supply power: ............................................................................................. 2.5 W

Specifications

ComTec GmbH 2-2

2.4. Diagrams

2.4.1. 0 to –400mV falling edge pulse response

TA1000B-10 (x10), Input 20mV/div, Output 100mV/div

TA1000B-50 (x50), Input 5mV/div, Output 100mV/div

TA1000B-10BWL (x10), In 20mV/div, Out 100mV/div

TA1000B-50BWL (x50), In 5mV/div, Out 100mV/div

The scope pictures are taken using a

TEK11801C digital sampling scope with a

SD20 20 GHz loop-

through sampling head for input signals and a SD22 12.5GHz

low noise sampling head for output signals

Specifications

ComTec GmbH 2-3

TA1000B-100 (x100), Input 2mV/div, Output 100mV/div

TA1000B-200 (x200), Input 1mV/div, Output 100mV/div

TA1000B-100BWL (x100), In 2mV/div, Out 100mV/div

TA1000B-200BWL (x200), In 1mV/div, Out 100mV/div

The lower window of each plot shows details of the corresponding signals in the upper window.

There is also a (red colored) histogram of the output signal jitter at a -100mV or –130mV

threshold. The jitter's Peak-to-Peak value is visible at "PkPk" and its standard deviation in the

"RMSΔ" readout.

This jitter histogram gives a good indication of the timing accuracy and resolution that can be

expected.

And, one can very well see that the optimum threshold setting for timing measurements is often

not at half of the signal's amplitude but at some other level not too far from idle voltage where the

slew rate is at maximum.

Specifications

ComTec GmbH 2-4

2.4.2. Max. output broadband noise voltage

Normally the noise is given input referred, so to speak, it can be compared to the source signal

levels. For timing applications it is often more depicting to plot the total output noise of an

amplifier.

In the following scope pictures the output noise voltage of our TAx-amplifiers is accumulated over

10,000 waveforms corresponding to about 40 minutes of measurement time. Used was a

TEK11801C digital sampling scope with a SD22 12.5GHz sampling head. Thus, the displayed

noise voltage is accumulated over a long period and also over the full bandwidth of each

amplifier. The TAx's inputs were shortened, i.e. ZSource = 0Ω.

On the right side of each plot you can see a (red colored) histogram of all the voltage samples in

the respective picture. This gives the probability distribution of the noise voltage levels. And, you

can find some analysis data on the respective voltage distribution: Mean = average value, RMSΔ

=σ= standard deviation, PkPk = Peak-to-Peak voltage = max. – min. sample voltage, μ± 1σ=

percentage of samples that fall within ±1 standard deviation of the mean (.±2σ, ±3σrespectively).

Sampling Head alone, 2mV/div

Specifications

ComTec GmbH 2-5

TA1000B-10 (x10), 5mV/div

TA1000B-50 (x50), 10mV/div

TA1000B-10 BWL (x10), 5mV/div

TA1000B-50 BWL (x50), 10mV/div

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