| 摘要 |
<p>A transmitter (108) converts a complex baseband signal (140) having I and Q quadrature signal components (141) and (142) for transmission by an antenna (114). An intermediate frequency based complex-to-real up-converter (130) uses subsampling to convert the complex baseband signal (140) into a real digital signal (144) having digital signal representations (174). An intermediate frequency based bandpass filtering digital-to-analog converter (132) uses Delta-Sigma, bandpass techniques to convert the real digital signal (144) into a first analog signal (146) having analog signal representations (182). A post-conversion bandpass filter (134) isolates and boosts the signal-to-noise ratio of a selected analog signal representation (186) to output a second analog signal (148) having a post-filtered selected analog signal representation (192). A tracking bandpass filter (136) further bandpasses and up-converts the second analog signal (148) to output a transmittable signal (150) having a tracking-filtered selected analog signal representation (196).</p> |
