V1.3
TBMDA1
Modulated Wideband Driver Amplifier
1 Introduction
The TBMDA1 modulated wideband driver amplifier is designed in order to create an inexpensive signal source
for immunity testing of electronic building blocks and products. It is designed to be driven by the tracking
generator output of spectrum analyzers. With its gain of 22 dB and 1dB compression point of +22dBm, it can
boost the output power of a tracking generator up to 150mW. The TBMDA1 is ideal to drive Tekbox near field
probes in order to find the sensitive spot of an electronic circuit or to create electric fields up to 50V/m when
driving the Tekbox TEM Cell TBTC1, 25V/m when driving the TBTC2 or 18V/m when driving the TBTC3. Test
signals for immunity testing can be CW, AM or PM. Consequently, the TBMDA1 provides built in modulation
capability to generate 1kHz AM or PM signals. In PM mode, the TBMDA1 can also generate a 217Hz Signal with
12.5% duty cycle in order to simulate mobile phone TDMA noise.
Picture 1 – TBMDA1 modulated wideband driver amplifier front view
Picture 2 – TBMDA1 modulated wideband driver amplifier rear view
V1.3
25 MHz
50 MHz
100 MHz
500 MHz
1 GHz
1.5 GHz
2 GHz
2.5 GHz
3 GHz
21.6 dB
24.9 dB
25.5 dB
25.6 dB
24.9 dB
24.1 dB
22.2 dB
22.8 dB
25.8 dB
TBMDA1
Modulated Wideband Driver Amplifier
Application:
general purpose gain block
signal source for immunity testing, driving near field probes
signal source for immunity testing, driving TEM Cells
Features:
CW amplifier (modulation off)
1 kHz, 80% AM modulation
1 kHz, 50% duty cycle pulse modulation
217 Hz, 12.5% duty cycle pulse modulation
2 Electrical Specifications
Technical Data:
Input: 50 Ohm, SMA female
Output: 50 Ohm, SMA female
Nominal supply Voltage: 5V, typ. 235mA, Mini-USB-B connector
Maximum supply voltage: 5.5V
Maximum input power: +9dBm
1dB output compression point @ 40MHz: +21.5dBm
1dB output compression point @ 2 GHz: +22.5dBm
3rd order output intercept point @ 40 MHz: +39dBm
3rd order output intercept point @ 2 GHz: +42dBm
Reverse isolation S12: -45dB
Noise Figure: 3 … 4 dB
Internal modulation frequency AM: 1 kHz ±10%
Internal modulation frequencies PM: 1 kHz ±10%, 217 Hz ±20%
Duty cycle, PM: 50% ±10% @ 1 kHZ; 12.5% ±20% @ 217 Hz
Gain:
Table 1 – TBMDA1 gain
V1.3
TBMDA1
Modulated Wideband Driver Amplifier
Picture 3 – TBMDA1, gain, 300 kHz – 100 MHz, lin.
Picture 4 – TBMDA1, gain, 300 kHz – 3 GHz, lin.
V1.3
TBMDA1
Modulated Wideband Driver Amplifier
3 Driving the TBMDA1 with a tracking generator
WARNING:
Picture 5 – DSA815 input protected with a 20dB attenuator
V1.3
TBMDA1
Modulated Wideband Driver Amplifier
Picture 6 – output power of the TBMDA1, CW, driven by the DSA815 tracking generator set to -5dBm
V1.3
TBMDA1
Picture 7 – output power of the TBMDA1, CW, driven by the DSA815 tracking generator set to -3dBm
Modulated Wideband Driver Amplifier
Picture 8 – output power of the TBMDA1, CW, driven by the DSA815 tracking generator set to -1dBm
V1.3
TBMDA1
Picture 9 – output power of the TBMDA1, CW, driven by the DSA815 tracking generator set to 0dBm
Modulated Wideband Driver Amplifier
Picture 10 – output power of the TBMDA1, 1 kHz, 50% pulse modulation, driven by the DSA815 tracking generator set to
0dBm, zero span, 1GHz
V1.3
TBMDA1
Modulated Wideband Driver Amplifier
Picture 10 – output power of the TBMDA1, 217 Hz, 12.5% pulse modulation, driven by the DSA815 tracking generator set to
0dBm, zero span, 1GHz
Picture 11 – output power of the TBMDA1, 1 kHz, 80% amplitude modulation, driven by the DSA815 tracking generator set to
0dBm, zero span, 1GHz
4 Applications
V1.3
TBMDA1
Modulated Wideband Driver Amplifier
V1.3
Part Number
Description
TBMDA1
modulated driver amplifier, 1 pc 25cm SMA-male to SMA-male cable, 1 pc 75cm SMAmale to N-male cable. 1 pc SMA-female to N-male coaxial adapter, USB cable,
measurement plot
Version
Date
Author
Changes
V1.0
13.8.2016
Mayerhofer
Creation of the document
V1.1
16.8.2016
Mayerhofer
Chapter 2 updated
V1.2
10.9.2016
Mayerhofer
Frequency response updated
V1.3
14.11.2016
Mayerhofer
Chapter 5 updated, deliverables
TBMDA1
Modulated Wideband Driver Amplifier
5 Ordering Information
6 History
Table 2 – Ordering Information
Table 3 – History
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