Main amplifier adjacent channel transmission enhancement method e.g. for mobile RF terminal, involves comparing rectified voltage of return wave with threshold value

摘要

A method for improving adjacent channel transmission of a main amplifier (2) involves detecting (7,8) a return wave, comparing (4) a value obtained from the return wave with a threshold value and reducing the amplification of a variable amplifier (1) depending on the comparison, so that the output power of the main amplifier (2) decreases. The value obtained from the return wave is specifically a rectified voltage. An Independent claim is given for a device for improving adjacent channel transmission