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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.
Type
Nominal
Gain
[V/V]
TA1000B-10
10
(6)
10
TA1000B-10 BWL
TA1000B-50
50
(6)
50
TA1000B-50 BWL
TA1000B-100
100
(6)
100
TA1000B-100 BWL
TA1000B-200
200
(6)
200
TA1000B-200 BWL
(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)
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!).
ComTec GmbH
Description
Nominal
Small
Gain
Gain
Signal
Flatness
[dB]
Band-
width
(-3dB)
(0) (1)
(0) (1)
20dB
710MHz
0.00dB
20dB
170MHz
0.00dB
34dB
1000MHz
0.22dB
34dB
245MHz
0.00dB
40dB
950MHz
0.12dB
40dB
245MHz
0.00dB
46dB
400MHz
0.00dB
46dB
110MHz
0.00dB
Fig. 1.1: Comparison chart
Peaking
Noise
Input Referred
(100ps
Figure
Broadband Noise
Rise Time
(100MHz)
(DC ... 12.5GHz)
Input
Pulse)
(0) (2)
(3) (4)
51.2µV
6%
8dB
0%
30.2µV
57.8µV
9%
36.6µV
0%
55.9µV
8%
34.2µV
0%
31.2µV
0%
23.1µV
0%
Input
Referred
LF Noise
(20Hz ...
1MHz)
(4)
(5)
0.224mV
0.3µV
rms
p-p
rms
0.124mV
rms
p-p
0.541mV
0.5µV
rms
p-p
rms
0.509mV
rms
p-p
0.542mV
12.3µV
rms
p-p
rms
0.318mV
rms
p-p
0.331mV
13.6µV
rms
p-p
rms
0.223mV
rms
p-p
1-1
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