countmybones
Junior Member level 3
lna bfr540
Hi, how do I select a suitable transistor for a wideband LNA with a bandwidth from 1GHz to 6GHz? Since the upper frequency is 6GHz, I assume the minimum transition frequency should be 12GHz. Is it necessary to do so? Do I need to select a transistor that is specifically made for wideband operation or any general purpose transistor will do? I have looked at several transistors from Phillips, Agilent and Siemens with transition frequency up to 25GHz. The Phillips BFG520, BFR520 and BFR540 for example are specified as a 9GHz wideband transistor, but the transition frequency is only 9GHz. While the Siemens SIEGET 25 BFP405 and BFP420 are not specified with any wideband operation, but they have transition frequency of 25GHz. So which one do I choose? Other transistors that I have seen is the Siemens BFP193W and BFP183W. Thank you.
Hi, how do I select a suitable transistor for a wideband LNA with a bandwidth from 1GHz to 6GHz? Since the upper frequency is 6GHz, I assume the minimum transition frequency should be 12GHz. Is it necessary to do so? Do I need to select a transistor that is specifically made for wideband operation or any general purpose transistor will do? I have looked at several transistors from Phillips, Agilent and Siemens with transition frequency up to 25GHz. The Phillips BFG520, BFR520 and BFR540 for example are specified as a 9GHz wideband transistor, but the transition frequency is only 9GHz. While the Siemens SIEGET 25 BFP405 and BFP420 are not specified with any wideband operation, but they have transition frequency of 25GHz. So which one do I choose? Other transistors that I have seen is the Siemens BFP193W and BFP183W. Thank you.