Clock signal generating device
AssigneeInfineon Technologies AG
InventorsThomas Steinecke, Dirk Hesidenz
Life of this patent
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Abstract
A clock signal generating device is described, having an oscillator and a PLL connected downstream thereof. The clock signal generating device is distinguished by the fact that a phase shifting device is provided between the oscillator and the PLL. This phase shifting device can temporally shift the edges of the signal output by the oscillator to a variable extent, and feeds the resultant signal to the PLL as an input signal. Such a clock signal generating device makes it possible to realize a spread spectrum oscillator which is constructed in a simple manner and can be made small.
Claims13
A clock signal generating device, comprising:
- an oscillator for outputting a signal having edges;
- a phase-locked loop connected downstream from said oscillator;
- and
- a phase shifting device for obtaining a resultant signal by temporally variably shifting the edges of the signal output by said oscillator;
- said phase shifting device configured for feeding the resultant signal to said phase-locked loop as an input signal;
- and
- said phase shifting device connected between said oscillator and said phase-locked loop.
A spread spectrum oscillator, comprising:
- an oscillator for outputting a signal having edges;
- a phase-locked loop connected downstream from said oscillator;
- and
- a phase shifting device for obtaining a resultant signal by temporally variably shifting the edges of the signal output by said oscillator;
- said phase shifting device configured for feeding the resultant signal to said phase-locked loop as an input signal;
- and said phase shifting device connected between said oscillator and said phase-locked loop.
Dependencies are inferred from the claim text.