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The Designer's Guide Community Forum › Design › RF Design › One stage LNA with MMIC invert phase?
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One stage LNA with MMIC invert phase? (Read 1782 times)
imett
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One stage LNA with MMIC invert phase?
Aug 09th, 2007, 7:15am  
Hi to everyone,
i'm an unskilled engeneer in RF solution, i've make my first LNA with a MMIC (like avago or HP MSA0886).
The simple LNA have a one stage amplifier  but with my lecroy oscilloscope i've see that the signal is inverted, i've make some mistake or it is usual have this invertion?
Mi goal is design a peakdetector for 1GHz, so the simple idea is use an amplifier and a zero bias schottky diode (HSMS285C).
Thanks in advance.
matteo    
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ACWWong
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Re: One stage LNA with MMIC invert phase?
Reply #1 - Aug 9th, 2007, 8:02am  
yes, for a single stage common-source amplifier, you would expect the signal inversion (as the gate voltage increase, the device takes more current, which develops more voltage across the load from Vsupply, so Vout decreases).
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