| 摘要 |
A frequency locked loop frequency synthesizer is comprised of a loop including a voltage controlled oscillator, a phase lock locked loop frequency detector, a divide by N counter and a low pass loop filter. A steering voltage is applied to the loop filter to produce a desired frequency or frequencies. The frequency lock loop frequency synthesizer drives the voltage controlled oscillator frequency to be N times the reference frequency. The frequency lock loop synthesizer inherently has 90 degrees less loop phase shift than a conventional phase lock loop. Additionally, the frequency lock loop frequency synthesizer provides a highly accurate, continuously tuneable, frequency synthesizer that includes a linear frequency detector in the frequency lock loop.
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