| 摘要 |
A frequency synthesizer, especially for use with a time-base generator of a fill-level meter employing the radar principle is designed to output a first frequency signal and a second frequency signal at mutually slightly different frequencies. The synthesizer incorporates a reference oscillator operating at a reference frequency and a control oscillator regulated at a control frequency. A first frequency divider with a division factor V<SUB>1 </SUB>is connected in line with the reference oscillator and a second frequency divider with the division factor V<SUB>2 </SUB>is connected in line with the control oscillator, which frequency dividers serve to output the first frequency signal and the second frequency signal, respectively The result is a stable frequency synthesizer with a large phase-control bandwidth and consequently an extremely short transient response time as well as broad-band phase-noise suppression. A method for operating the synthesizer is also disclosed.
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