Frequency jittering control for varying the switching frequency of a power supply
First Claim
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1. A frequency jittering circuit for varying the switching frequency of a power supply, comprising:
- an oscillator for providing a clock generated based on a hysteretic band for the power supply operative thereon; and
a hysteretic band modulator for providing a modulating signal to modulate the hysteretic band such that the clock has a jitter frequency, wherein the modulating signal is responsive to the clock.
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Abstract
A frequency jittering circuit modulates a hysteretic band of an oscillator such that the clock generated by the oscillator has a jitter frequency, and thus a switching mode power supply operative on the clock will have a jittering switching frequency.
63 Citations
24 Claims
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1. A frequency jittering circuit for varying the switching frequency of a power supply, comprising:
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an oscillator for providing a clock generated based on a hysteretic band for the power supply operative thereon; and a hysteretic band modulator for providing a modulating signal to modulate the hysteretic band such that the clock has a jitter frequency, wherein the modulating signal is responsive to the clock. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A frequency jittering method for varying the switching frequency of a power supply operative on a clock provided by an oscillator, comprising the steps of:
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modulating a hysteretic band of the oscillator according to a modulating signal; generating the clock based on the hysteretic band such that the clock has a jitter frequency wherein the modulating signal is responsive to the clock. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification