Patent ID: 8073408
Filing Date: 2011-12-06
Classification: H04B

Abstract:
1. A semiconductor integrated circuit comprising: a first input terminal configured to input a baseband signal; a second input terminal configured to input a local oscillation signal; an output terminal configured to output a modulating signal; a first amplifier circuit configured to receive the baseband signal through the first input terminal and to output a first amplified signal of the baseband signal; a 2-multiplying circuit configured to receive the local oscillation signal through the second input terminal and to output a 2-multiplied signal of the local oscillation signal; an adder configured to add the 2-multiplied signal and the first amplified signal and to output an addition signal; a second amplifier circuit configured to receive the addition signal and to output a second amplified signal of the addition signal; and a mixer configured to multiply the second amplified signal and the local oscillation signal, and to output the modulating signal to the output terminal.