| 摘要 |
PROBLEM TO BE SOLVED: To provide an amplifier which can be improved in sensitivity and NF characteristics.SOLUTION: The amplifier which amplifies a reception signal from an antenna comprises an input filter circuit 10, a source-grounded dual gate MOSFET amplifier circuit 20, an output filter circuit 30, and a DC-cut capacitor 40. The input filter circuit 10 receives the reception signal from the antenna and transmits a signal in the FM band. The source-grounded dual gate MOSFET amplifier circuit 20 amplifies an output signal of the input filter circuit 10. The output filter circuit 30 receives an output signal of the source-grounded dual gate MOSFET amplifier circuit 20 and transmits a signal in the FM band. The DC-cut capacitor 40 is inserted between the source-grounded dual gate MOSFET amplifier circuit 20 and the output filter circuit 40 and has a capacitance of less than 100 pF. |
