RF3330PCBA View Datasheet(PDF) - RF Micro Devices
Part Name
Description
MFG CO.
'RF3330PCBA' PDF : 10 Pages View PDF
RF3330
Preliminary
Output
On the output, the losses due to the resistive matching
pad must also be calibrated out of the setup. Because
of the 1:1 transformer, the spectrum analyzer appears
as a 50Ω resistor in parallel with this circuit (see Figure
2). Equation 4 illustrates the calculation necessary to
obtain the amount of loss due to this matching circuit.
The balun also has an additional 0.5dB to 1.0dB of
3
loss, which is added in to the overall output losses.
This was verified with a spectrum analyzer probe. The
offset used in the test setup is 32.5dB on the spectrum
analyzer.
Resistive Pad Loss=
20 * log (25 / (470 + 25 + 470)) = -31.7 dB
Eq. 4
Frequency =
1 MHz to
150 MHz
Frequency =
1 MHz to
150 MHz
Signal Generator
Mini-Circuits
ZMSCJ-2-1
Divider
Figure 1. RF3330 Test Setup
RF3330
Resistive
Match
1:1
Transformer
Frequency =
1 MHz to
150 MHz
3330410 Evaluation Board
Spectrum Analyzer
R4
470 Ω
R3
51 Ω
50 Ω
R2
470 Ω
Figure 2. Equivalent Output Circuit
3-8
Rev A2 010820
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