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Amplifier_UHF1.php 4939 Bytes 18-11-2015 20:42:33
Broadband UHF Amplifier
This is not a new invention. It's just a hack together of some (very) nice parts. And the result is yet another rf building block :-)
✈ Hardware Description
This design uses an GALI-39+ (from Minicircuits) as it has the lowest noise figure (of this series) NF = 2.4 dB. The gain is 20 dB.
The bias current can be adjusted by choosing six resistors. The bias of the monolithic amplifier is done with an TCBT-14+ (Minicircuits),
as it is very challenging to do it better ...
The gain at 3 GHz is slightly below the typical data, as FR4 starts degrading above 2 GHz. The bias is calculated for a supply of + 15V,
supply current is about 30 mA.
Figure 1. S21 (Gain)
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