| 摘要 |
PROBLEM TO BE SOLVED: To provide a modulator which can perform RF modulation with high accuracy, while suppressing generation of distortion.SOLUTION: A digital/analog conversion unit 12 has a pair of switches 21 provided in parallel for each bit, and is configured so that the current output is weighted depending on the bit, and an analog current signal is generated by controlling the switches 21 based on a digital signal. The digital/analog conversion unit 12 is configured so that a certain percentage of current of a corresponding current output flows regardless of the on/off of each switch 21, for all bits, and an analog current signal corresponding to the minimum value of the digital signal does not become zero. A local oscillation switch section 13 is configured to output the analog current signal while converting to a high frequency signal based on a local oscillation signal of high frequency band. |
