| 摘要 |
<p>For direct up- or down-conversion between baseband and carrier frequency signals, each component of such a signal is supplied to a first mixer together with a local oscillator signal at one-half the carrier frequency and the output from that first mixer is supplied to a second mixer together with the same local oscillator signal, but at a phase which differs by 90° from that of the local oscillator signal supplied to the first mixer.</p> |
