X hits on this document

180 views

0 shares

0 downloads

0 comments

37 / 81

© 2008 The McGraw-Hill Companies

37

9-3: Frequency Conversion

Local Oscillator and Frequency Synthesizers: Frequency Synthesizer

Most new receiver designs incorporate frequency synthesizers for the local oscillator, which provides some important benefits over simple VFO designs.

The synthesizer is usually of the phase-locked loop (PLL) design and the output is locked to a crystal oscillator reference which provides high stability.

Tuning is accomplished by changing the frequency division factor in the PLL, resulting in incremental rather than continuous frequency changes.

Document info
Document views180
Page views180
Page last viewedWed Dec 07 19:12:45 UTC 2016
Pages81
Paragraphs754
Words4696

Comments