| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a frequency characteristic correction transmitter in which EVM and frequency distortion are improved accurately by measuring the frequency characteristics of a desired band including the in-band and out-band instantaneously and accurately, and then correcting the frequency characteristics. <P>SOLUTION: The frequency characteristic correction transmitter comprises: a modulation wave signal source 1; a multi-carrier signal source 2; and an input signal switching unit 4 which selects a modulation wave signal generated from the modulation wave signal source 1 or a multi-carrier signal generated from the multi-carrier signal source 2. In a frequency characteristic measurement mode, the multi-carrier signal is selected by the input signal switching unit 4, and the multi-carrier signal flows to each component. Since the multi-carrier signal has a uniform signal level over a wide band including in-band and out-band, the frequency characteristic over a wide band corresponding to the multi-carrier signal can be measured and corrected instantaneously and accurately in a frequency characteristic comparison unit 13 and a frequency characteristic correction unit 5. <P>COPYRIGHT: (C)2013,JPO&INPIT |
