RING OSCILLATOR CIRCUIT AND METHOD
First Claim
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1. A circuit comprising:
- a voltage controlled oscillator (VCO) having a supply input;
a regulator having an output coupled to the supply input of the VCO; and
an oscillation dampening circuit having an output coupled to the output of the regulator, and wherein an impedance of the oscillation dampening circuit is configured to vary based on current provided to the supply input of the VCO.
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Abstract
Oscillator circuits and methods are disclosed. In an embodiment, a circuit includes a voltage controlled oscillator (VCO) and a regulator coupled to a supply input of the VCO. The circuit also includes an oscillation dampening circuit coupled to an output of the regulator. A resistance or a capacitance of the oscillation dampening circuit is configured to vary based on current provided to the VCO.
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Citations
24 Claims
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1. A circuit comprising:
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a voltage controlled oscillator (VCO) having a supply input; a regulator having an output coupled to the supply input of the VCO; and an oscillation dampening circuit having an output coupled to the output of the regulator, and wherein an impedance of the oscillation dampening circuit is configured to vary based on current provided to the supply input of the VCO. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for dampening oscillations at a voltage controlled oscillator, the method comprising:
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receiving a voltage based on a current provided to a voltage controlled oscillator (VCO); and dampening oscillations using a variable impedance, wherein the variable impedance is responsive to the voltage at an output of a regulator that controls the current provided to the VCO. - View Dependent Claims (10, 11, 12, 13)
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14. A non-transitory computer readable medium comprising instructions wherein the instructions, when executed by a processor cause the processor to control operations comprising:
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receiving a voltage based on a current provided to a voltage controlled oscillator (VCO); and dampening oscillations using a variable impedance responsive to the voltage at an output of a regulator that controls the current provided to the VCO. - View Dependent Claims (15, 16, 17)
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18. An apparatus comprising:
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means for generating an oscillating signal; means for regulating a supply input of the means for generating; and means for dampening oscillations, the means for dampening coupled to an output of the means for regulating, wherein an impedance of the means for dampening is configured to vary based on current that is provided to the means for generating. - View Dependent Claims (19, 20)
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21. A circuit comprising:
an oscillation dampening circuit coupled to an output of a regulator, wherein the oscillation dampening circuit includes; a first capacitor having a first terminal coupled to the output of the regulator and having a second terminal; and a first transistor having a gate terminal, a drain terminal, and a source terminal, wherein the drain terminal of the first transistor is coupled to the second terminal of the first capacitor, wherein the source terminal of the first transistor is coupled to a supply node, and wherein the gate terminal of the first transistor is coupled to an output of a current mirror circuit that is configured to mirror a supply current of a voltage controlled oscillator (VCO). - View Dependent Claims (22, 23, 24)
Specification