Patent ID: 9300513
Filing Date: 2016-03-29
CPC Classification: H03F,H04L

Claim Text:
1. A signal transmission device comprising: a first modulation unit configured to generate a first modulated signal having at least three logic levels, by modulating an input signal; a characteristic adjustment unit configured to generate an adjusted first modulated signal by adjusting, based on an adjustment signal, at least one of a plurality of first electrical characteristic values that correspond to the at least three logic levels of the first modulated signal; a second modulation unit configured to generate a second modulated signal, by modulating the adjusted first modulated signal, based on a carrier signal; a power amplification unit configured to amplify power of the second modulated signal, and to output an amplified second modulated signal; and an adjustment operation unit configured to generate the adjustment signal, based on the first electrical characteristic values and based on a plurality of second electrical characteristic values that correspond to at least three logic levels of the amplified second modulated signal; wherein the characteristic adjustment unit is configured to adjust the at least one of the first electrical characteristic values, based on the adjustment signal, such that a ratio of differences between each of the second electrical characteristic values is the same as a ratio of differences between each of the first electrical characteristic values.