| 摘要 |
An auto level and gain control apparatus for amplifying a signal is provided to reduce manufacturing cost and simplify the structure of a circuit by forming the circuit with a closed loop. An input detector(110) detects a voltage level of an input signal, and an output detection unit(130) detects the voltage level of the output signal of an amplifier. An automatic level control(140) produces the difference signal of the base level inputted to the controller of the input detector. The automatic level control adds the difference signal and the voltage level of the input signal and outputs the automatic level control signal which is the difference of them. The auto gain control part(160) adds the output signal and AGC base level of the automatic level control, and added signal is outputted to the input signal controller. |
