| 摘要 |
A low noise amplifier (LNA) comprises: a plurality of FETs (F 1 , F 2 , F 3 , F 4 ) arranged to process signals received by the amplifier; a power input ( 10 ) arranged to receive electrical power to operate the LNA; and a monolithic support integrated circuit (IC). The monolithic support IC comprises: a FET control circuit ( 2 ) arranged to monitor and control the drain current of each FET; a FET selection circuit ( 3, 24, 22 ) arranged to detect the level of a DC component of a voltage signal supplied to the power input and to provide a FET selection signal to the FET control circuit ( 2 ) according to the detected DC level.
|
