FAST ComTec TA1000B-x User Manual - page 4
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
51.2µV
rms
0.224mV
p-p
0.3µV
rms
TA1000B-10 BWL
(6)
10
20dB
170MHz
0.00dB
0%
30.2µV
rms
0.124mV
p-p
TA1000B-50
50
34dB
1000MHz
0.22dB
9%
57.8µV
rms
0.541mV
p-p
0.5µV
rms
TA1000B-50 BWL
(6)
50
34dB
245MHz
0.00dB
0%
36.6µV
rms
0.509mV
p-p
TA1000B-100
100
40dB
950MHz
0.12dB
8%
55.9µV
rms
0.542mV
p-p
12.3µV
rms
TA1000B-100 BWL
(6)
100
40dB
245MHz
0.00dB
0%
34.2µV
rms
0.318mV
p-p
TA1000B-200
200
46dB
400MHz
0.00dB
0%
31.2µV
rms
0.331mV
p-p
13.6µV
rms
TA1000B-200 BWL
(6)
200
46dB
110MHz
0.00dB
0%
23.1µV
rms
0.223mV
p-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