RF1 and RF2 are not DC shorted, you have to connect RF1 or RF2 to DC ground thru a shunt inductor for instance.If you bias RF1 or RF2 to a DC voltage (reference) then this reference will be substracted from the Vbias (Vbias - reference)Hope it answer...
Hello,There is No GND pin, for Bias pin reference you should provide DC ground return through RF1 or RF2No matter which one as they are DC connected internally in the PTICBest Regardsjean-pierre.proot@st.com