I have cascaded two LNA's and when i apply voltage to both amplifers the floor on my spectrum analyzer increases 20dB to about (-50dB). When i apply voltage to just one amplifer, the specturm analyzer's noise floor(?) stays at (-75dB). Is that normal? or a product of the cascaded amplifer? Also will this increased floor reduce the ability to receive singals lower than the floor? thx.
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