Patent ID: 7092683

Claim:
A transmission circuit comprising: modulated signal generating means for generating a modulated signal including a phase and an amplitude; a modulated signal line for transmitting the modulated signal, the modulated signal line being connected to the modulated signal generating means; amplitude modulated voltage generating means for generating an amplitude modulated voltage in accordance with the amplitude of the modulated signal generated by the modulated signal generating means, the amplitude modulated voltage generating means being connected to the modulated signal line; an amplitude modulated voltage line for transmitting the amplitude modulated voltage, the amplitude modulated voltage line being connected to the amplitude modulated voltage generating means; and amplitude bandwidth limiting means for attenuating the amplitude modulated voltage output from the amplitude modulated voltage generating means by using a damping property represented by an exponential function in which an argument is exponentially proportional to a frequency, the amplitude bandwidth limiting means being interposed in the amplitude modulated voltage line.