| 摘要 |
A low noise amplifier for improving a sensitivity characteristic is provided to switch a bias voltage according to a level of a received signal, thereby amplifying an RF signal of a weak electric field and reducing an RF signal of a strong electric field. A low noise amplifier for improving a sensitivity characteristic comprises a switch(100) and a low noise amplifying circuit(300). The switch turns on or off an operation power(Vcc) according to a level of a received signal. The low noise amplifying circuit includes an amplifying transistor(Q) and a bias circuit(310,320,330). When the operation power is applied to the circuit according to the turning on of the switch, a normal bias is formed and an input signal is amplified. When the operation power is blocked by the switch, the input signal is reduced as many as a predetermined level through a part of the bias circuit. |
