| 摘要 |
<p>The double conversion modulator has a first conversion stage (1) with a first modulator block. There is a second block modulator (202) similar to the first block. Base band signals (bb1,bb1b, bbQ, bbQb) are received and controlled by four signal carriers (IFIQ,IFIQb). A second signal is delivered providing a second sign conversion (IF1cb) in opposition to the first signal providing a first intermediate frequency.</p> |
