| 摘要 |
<p>A digital broadcast transmitting device and an exciter are provided, which have an AGC function that saves power, saves a space and easily sets various types of output levels. In a level adjusting unit 8 which receives an input of a baseband digital signal from a modulation processing unit 1, a comparator 82 generates an error signal from a difference between a level signal obtained by digitizing a feedback signal from a power amplifier by A/D 6 and a reference voltage generated by a reference generating unit 81, and an AGC multiplier/divider 85 carries out digital multiplying/dividing count to the baseband digital signal with or by a gain coefficient such that the error signal becomes 0. Thereby, AGC which controls transmission output from the power amplifier at a fixed level is carried out.</p> |
