Frequency jitter circuit and method
AssigneeRichtek Technology Corporation
InventorsCHIEN-FU TANG, ISAAC Y. CHEN
Life of this patent
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Abstract
An oscillator generates a clock signal according to a voltage, a current and a capacitance, and a frequency jitter circuit and method use a random number to modulate the voltage, the current or the capacitance, or a count value to modulate the capacitance, to jitter the frequency of the clock signal.
Claims16
A frequency jitter circuit comprising:
- a capacitor having a capacitance;
- a voltage source providing a voltage;
- a current source providing a current;
- an oscillator connected to the capacitor, the voltage source and the current source, generating a clock signal according to the capacitance, the voltage and the current;
- and
- a random number generator connected to the current source, providing a random number to the current source to modulate the current for jittering a frequency of the clock signal.
A frequency jitter circuit comprising:
- a capacitor having a capacitance;
- a voltage source providing a voltage;
- a current source providing a current;
- an oscillator connected to the capacitor, the voltage source and the current source, generating a clock signal according to the capacitance, the voltage and the current;
- and
- a random number generator connected to the voltage source, providing a random number to the voltage source to modulate the voltage for jittering a frequency of the clock signal.
A frequency jitter circuit comprising:
- a capacitor having a capacitance;
- a voltage source providing a voltage;
- a current source providing a current;
- an oscillator connected to the capacitor, the voltage source and the current source, generating a clock signal according to the capacitance, the voltage and the current;
- and
- a random number generator connected to the capacitor, providing a random number to modulate the capacitance for jittering a frequency of the clock signal.
A frequency jitter circuit comprising:
- a capacitor having a capacitance;
- a voltage source providing a voltage;
- a current source providing a current;
- an oscillator connected to the capacitor, the voltage source and the current source, generating a clock signal according to the capacitance, the voltage and the current;
- and
- a counter connected to the capacitor and the oscillator, generating a count value responsive to the clock signal to modulate the capacitance for jittering a frequency of the clock signal.
A frequency jitter method comprising the steps of:
- (A) generating a clock signal according to a capacitance, a voltage and a current;
- and
- (B) modulating the current by a random number for jittering a frequency of the clock signal.
A frequency jitter method comprising the steps of:
- (A) generating a clock signal according to a capacitance, a voltage and a current;
- and
- (B) modulating the voltage by a random number for jittering a frequency of the clock signal.
A frequency jitter method comprising the steps of:
- (A) generating a clock signal according to a capacitance, a voltage and a current;
- and
- (B) modulating the capacitance by a random number for jittering a frequency of the clock signal.
A frequency jitter method comprising the steps of:
- (A) generating a clock signal according to a capacitance, a voltage and a current;
- (B) generating a count value responsive to the clock signal;
- and
- (C) modulating the capacitance by the count value for jittering a frequency of the clock signal.
Dependencies are inferred from the claim text.