| 摘要 |
An LNA loop through circuit is provided to improve the signal attenuation property of a loop through line in front of a tuner of a broadcasting receiver. A low-noise amplifying circuit(100) amplifies a received signal inputted. The first switch(D11) is connected between an input stage and the low-noise amplifying circuit. The third switch(D30) is installed on a bypass line and transfers the received signal which is inputted through the input stage, to an output stage through the bypass line. A switching controller(200) supplies an amplification-on voltage to the first switch and the second switch. |
