| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a pulse modulating circuit that can suppress a leak of an RF signal inputted to an amplifier to a bias circuit and applies a DC pulse signal with a narrow pulse width to the amplifier. <P>SOLUTION: The pulse modulating circuit of the present invention is characterized in that a switching means of performing switching operation with the DC pulse signal and a low-pass filter which has a passing area of frequency corresponding to the reciprocal of the pulse width of the DC pulse signal are arranged in this order between a DC power source and a DC bias terminal and a capacitor which has such a capacity value that the impedance from the switching means to the DC power source side is considered to be 0 at respective frequencies corresponding to the reciprocal of the pulse width of the DC pulse signal applied to the switching means. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
