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English: Block diagram of a superheterodyne radio receiver using a frequency synthesizer. Older superheterodynes use a LC oscillator as the local oscillator which is tuned to different stations with a variable capacitor. However this type of oscillator's frequency is not very stable, causing the receiver to drift off the frequency of the station, Modern receivers use a master crystal oscillator which uses the vibrations of a quartz crystal to produce a very stable frequency. Since a crystal oscillator's frequency cannot be varied, to tune the receiver to different stations a digital circuit called a frequency synthesizer is used to generate different frequencies from the master oscillator signal. The synthesizer uses a phase locked loop so that the new frequency is locked to the master oscillator frequency. The frequency to be generated is specified by a digital "frequency control word" (FCW), which is generated by digital channel selection logic
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Author Chetvorno
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Block diagram of a receiver with a frequency synthesizer

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3 May 2017

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Date/TimeThumbnailDimensionsUserComment
current15:53, 9 May 2017Thumbnail for version as of 15:53, 9 May 20172,192 × 967 (46 KB)ChetvornoReplaced invalid SVG version with "plain SVG" version that passes validation
19:06, 4 May 2017Thumbnail for version as of 19:06, 4 May 20172,192 × 967 (58 KB)ChetvornoMinor tweaks; lightened fill to distinguish arrow
15:48, 3 May 2017Thumbnail for version as of 15:48, 3 May 20172,192 × 967 (57 KB)ChetvornoUser created page with UploadWizard

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