Chapter 7: Communication Techniques EET-223: RF Communication - - PowerPoint PPT Presentation

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Sep 11, 2023 120 likes •155 views

Chapter 7: Communication Techniques EET-223: RF Communication Circuits Walter Lara Basic Frequency Synthesizer Often a highly accurate and programmable frequency source is needed (function generators, spectrum analyzers, communication

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Chapter 7: Communication Techniques

EET-223: RF Communication Circuits Walter Lara

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Basic Frequency Synthesizer

Often a highly accurate and programmable

frequency source is needed (function generators, spectrum analyzers, communication circuits)

Recall PLL, but add frequency divider (see Block

Diagram in Fig 7-14)

Phase Comparator and the VCO make sure that

fR = fout / N (assuming locked stated). So: fout = N fR

Notice fout is multiple of fR, so smaller fR gives better

resolution (but oscillator drift also multiplied by N)

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Figure 7-14 Basic frequency synthesizer.