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25. December 2024
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VHF Amplifier with the BGA 2817 (NXP)
Yet another MMIC wideband amplifier - DC to 2.2 GHz.
The assembled prototype
✈ The Design
The design was mainly inspired by the BGA 2817 datasheet. It uses only two capacitors
for input / output ac-coupling.
There is no inductor necessary to supply the dc !
As it runs on 3.3 Volts (20 mA), a 78L33 (SO-8) voltage regulator was added to allow for
higher supply voltages. (7...30 V). Having such a low supply also suggests, that the output
power is not that high. The datasheet specifies 5 dBm at 2150 MHz. We measured 7 dBm at 100 MHz.
If you want more, maybe a 5 Volt regulator (ABSOLUTE MAXIMUM RATINGS) will do the trick.
Even so the datasheet says: "General purpose low noise wideband amplifier for frequencies between
DC and 2.2 GHz", we would not call a NF of 3.9 dB as "low noise", but as a second stage
it mayst work fine. Keep in mind that the maximum input power should not go above
Pin <= -20 dBm (unless you want to create harmonics :-)
✈ Downloads
✈ Performance - Matching : S11, S22
The matching is better than 10 dB up to more than 2 GHz. This makes this amplifier a beautiful candidate
to be used to terminate a mixer very broadband-ly !
✈ Performance - Isolation : S12
Isolation is better than 30 dB up to more than 6 GHz. Maybe some antistatic foam may improve that figure
even more. The datasheet calls up number of 39 dB up to 2150 MHz.
✈ Performance - Gain : S21
The Gain is 25 dB up to 2 GHz. It then drops slightly to 13 dB at 4 GHz. This mayst be caused by the used
FR-4 pcb material. If you want to go higher, Rogers™ is your friend.
✈ Share your thoughts
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