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Broadband_LNA_QPL9547.php    6077 Bytes    14-06-2024 19:15:39


Broadband LNA with the QPL9547


1 MHz - 2 GHz, NF 0.6 dB, Gain 25 dB, 21 dBm (max)




Broadband LNA with the QPL9547





Circuit Description




This is our version of the Low Noise Amplifier from Quorvo. We used FR4 as this is budget-friendlier. The revenge is lower gain at higher frequencies. If you need the approx. 10 dB Gain @ 6 GHz, you mayst want to use Rogers™ RO4350B / 0.8 mm as described in UKW berichte 2/2023 (article by Wolfgang Schneider, DJ8ES). As a bias, we used the TCBT-14+ from Mini - Circuits. This is a better choice than any 18 nH / 0603 as it is broadband-isher :-)




1 dB Compression Point




The figure below shows, that 1 dB compression is at an input level of approx. 0 dBm. Data measured at 1 GHz. Supply : 10 V, 70 mA


Broadband LNA with the QPL9547




Frequency Response : S21




The revenge of using FR4 is clearly seen above 2 GHz. With Rogers™ RO4350B, 19 dB are approachable @ 2GHz.


Broadband LNA with the QPL9547

S21 from 500 kHz to 6 GHz




Matching : S11 and S22




As most LNA's have a poor matching, so does this. The datasheet specifies a typical value of 12.2 dB (S11) and 13.5 dB (S22).


Broadband LNA with the QPL9547

S11 is acceptable from 100 MHz to 6 GHz


Broadband LNA with the QPL9547

S22 is acceptable from 3 MHz to 6 GHz




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t1 = 6585 d

t2 = 188 ms

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