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US 11,336,289 B2Granted
Clock generator
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorHiroaki Kojima
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Abstract
According to a clock generator, an oscillator outputs source oscillation clocks which are trimmed according to a trimming code. A first frequency divider generates X frequency division clocks by frequency-dividing the source oscillation clocks by a first frequency division ratio X. A trimming controller changes the trimming code within a period of the X frequency division clocks and supplies the changed trimming code to the oscillator.
Claims7
A clock generator comprising:
- an oscillator configured to output source oscillation clocks which are trimmed according to a trimming code;
- a first frequency divider configured to generate first frequency division clocks by frequency-dividing the source oscillation clocks by a first frequency division ratio;
- and
- a trimming controller configured to supply the trimming code to the oscillator by changing the trimming code within a period of the first frequency division clocks, wherein the trimming controller comprises:
- a second frequency divider configured to generate second frequency division clocks by frequency-dividing the source oscillation clocks by a second frequency division ratio which differs from the first frequency division ratio,
- a spread spectrum pattern generating circuit configured to generate a spread spectrum code which is changed in synchronism with the second frequency division clocks, and
- an adding circuit configured to change the trimming code by adding the spread spectrum code generated in synchronism with the second frequency division clocks to a basic trimming code, and to supply the trimming code to the oscillator.
4 more elements
Dependencies are inferred from the claim text.