Analog image signal occurrence circuit, analog composite image signal occurrence method, analog signal synthetic circuit, analog signal synthetic method, semiconductor integrated circuit and image equipment

摘要

In the analog image signal occurrence circuit, reversal output terminal NDAOUT4 of differential output D/A converter DAC4 of 1st electric current addition type and reversal output terminal NDAOUT5 of differential output D/A converter DAC5 of 2nd electric current addition type are connected, electric current - voltage transmitter, RL6 and the input terminal of reversal amplifier AMP are connected by the connection, the output terminal of that reversal amplifier AMP is connected to 1st image signal output terminal COMPout. Because with this constitution, the adding machine is not used, as it is possible, to decrease the price of the image equipment, because electric current addition type D/A converter DAC4 of differential output type and DAC5 are used, the electric current which is consumed with the D/A converter is effectively utilized. Therefore, making use of the adding machine, as part cost is decreased, the electric current which is consumed inside the electric current addition type D/A converter being effectively utilized, electric power consumption conversion is assured low.