| 摘要 |
A low noise amplifier (LNA) comprises: a plurality of FETs (F1, F2, F3, F4) 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.
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