| 摘要 |
PURPOSE: To provide a system capable of reducing the bias of an amplifier as little as possible without clipping an input signal. CONSTITUTION: The system is provided with a means 11 for sampling a part of an input signal Ve to an amplifier IQ, a means 12 for attenuating the sampled signal, a means 15 for detecting the attenuated signal, a means 16 for comparing detected voltage Vd with reference voltage Vref and supplying a logical level, a means 17 for receiving the logical level and generating a control signal S to be applied to the attenuation means 12 so that the detected voltage Vd becomes almost equal to the reference voltage Vref, and a means 18 for receiving the control signal S from the control means 17 and generating a bias signal Vp and these means are mutually cooperated so as to reduce the bias of the amplifier 10 as less as possible whale amplifying the input signal Ve without clipping it. |
