Patent ID: 7336130
Filing Date: 2008-02-26
Classification: H03G

Abstract:
1. An attenuator, which attenuates input signals and outputs the attenuated signals to an amplifier arranged to amplify signals applied to two input terminals of the amplifier, the attenuator comprising: first and second output terminals to be respectively connected to the two input terminals of the amplifier; a comparison determination circuit arranged to compare a data variable corresponding to a current attenuation factor with target data corresponding to an attenuation factor defining a target value, to output an up signal or a down signal; and an up-down counter arranged to increase or decrease the data variable based upon the up signal or the down signal which is outputted from the comparison determination circuit; wherein the input signals respectively attenuated by different attenuation factors are outputted to the first and second output terminals based upon the data variable outputted from the up-down counter.