| 摘要 |
<p>A digital phase shifter uses a heterodyne concept to mix a continuous wave (cw) signal with a local oscillator [VCXO] which is an integer multiple of the difference frequency. The difference frequency is phase-locked, and the local oscillator frequency is divided into N increments by a counter. The count of the counter is compared to a microprocessor generated phase shift value which is added to the difference frequency. The phase shifted difference frequency is then converted up to produce the phase shifted continuous wave signal [F<Sub>sc</Sub>(out)]. </p> |
