Frequenz- oder Phasenmodulation
A frequency or phase modulator, in particular a DC-coupled frequency modulation synthesizer, comprises a voltage-controlled oscillator (1) in series with a divider (2) in a phase-locked loop, and an analogue-to-digital converter (17) connected to control the divider in accordance with an input analo...
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| Zusammenfassung: | A frequency or phase modulator, in particular a DC-coupled frequency modulation synthesizer, comprises a voltage-controlled oscillator (1) in series with a divider (2) in a phase-locked loop, and an analogue-to-digital converter (17) connected to control the divider in accordance with an input analogue modulation signal. The converter (17), preferably a one-bit charge-balanced converter, has a noise-shaped frequency response to reduce noise at frequencies below the loop-bandwidth. |
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