levnu
Full Member level 2
Two related questions:
1.
if i split an RF signal into 2 lines and amplify it with 2 same PAs and then combine it again into one RF signal, how do i get ~3dB of power gain? from where i win 3 db ? i split amplify and combine... isn't it energy from nothing?
2. if for e.g. in a specific operational point i input RF signal with qpsk digital modulation and measure ACPR of -30dBc at a single Power amplifier, if input this signal into two parallel PAs as in question 1 , will i see same ACPR of -30dBc or somehow it can become -27dBc?
1.
if i split an RF signal into 2 lines and amplify it with 2 same PAs and then combine it again into one RF signal, how do i get ~3dB of power gain? from where i win 3 db ? i split amplify and combine... isn't it energy from nothing?
2. if for e.g. in a specific operational point i input RF signal with qpsk digital modulation and measure ACPR of -30dBc at a single Power amplifier, if input this signal into two parallel PAs as in question 1 , will i see same ACPR of -30dBc or somehow it can become -27dBc?