luciforlove
Member level 1
there is a LNA schem,when it doesnot work,a negative voltage is added on a BJT's base ,then it work on cut-off region,why?is it for prevent big singal from damaging LNA?
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there is a LNA schem,when it doesnot work,a negative voltage is added on a BJT's base ,then it work on cut-off region,why?is it for prevent big singal from damaging LNA?
thank you sir,that make senseThe reason of the negative bias is to increase the input/output isolation when the LNA is in OFF state.
In BJT this helps a little bit, but FET's provides better isolation in reverse bias state.