RMDA20420 Просмотр технического описания (PDF) - Raytheon Company
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RMDA20420 Datasheet PDF : 13 Pages
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RMDA20420
RF Components 20-42 GHz General Purpose MMIC Amplifier
ADVANCED INFORMATION
Application
Information
multiplier
operation
The test set up for this mode of operation is as shown in Figure 1.The biasing procedure requires the
gate voltage Vg1 to be initially set to –1.0V. Next the drain voltage Vd1 was set to +2.0V. The input
frequency was selected to give the desired tripled output and the input drive level was set to +14dBm.
The output of the RDMA20420 was observed and the harmonics of the input frequency were visible on
the spectrum analyzer display. The gate voltage Vg1 was adjusted gradually to peak the third harmonic.
Lowering Vg1 resulted in peaking the third harmonic. Then the drain voltage Vd1 was adjusted to tweak
the power level of the third harmonic. Tweaking Vg1 and Vd1 at this point resulted in further
optimization of the desired harmonic or suppression of the unwanted harmonic as required. The range
for Vg1 was between –0.1 to –0.6V and the range for Vd1 was between +1.1 to +1.8V. The above
procedure was repeated for each input frequency tested.
Figure 5 shows the tripled output for the RMDA20420 biased as described above. Input frequencies
were selected to give tripled frequencies falling in the 21 to 39 GHz band. The graph shows tripled
output powers greater than +10dBm up to 39 GHz. The power levels of the first and second harmonics
were also plotted to show the level of suppression of the unwanted harmonics. The graph shows for a
tripled frequency of 30 GHz the output power was +14 dBm, the fundamental (10GHz) power level was
–17 dBm and the second harmonic (20 GHz) power level was +3 dBm. The conversion gain for the
tripled output at 30GHz was 0dB. For tripled frequencies between 21 to 39GHz, the conversion gain
was better than –4 dB.
20
15
10
21GHz
5
3xFo
30GHz
Conversion
Gain =0
39GHz
0
2xFo
-5
-10
-15
1xFo
-20
20
22
24
26
28
30
32
34
36
38
40
Tripled Frequency (GHz)
Figure 5. Measured Tripler Performance.
www.raytheonrf.com
Specifications are based on most current or latest revision.
Revised February 6, 2003
Page 13
Raytheon RF Components
362 Lowell Street
Andover, MA 01810
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