Suppression of noise up-conversion mechanisms in LC oscillators
First Claim
1. A phase-locked loop (PLL) circuit comprising:
- an oscillator;
a frequency control device, the frequency control device generating a frequency control signal that controls a frequency of the oscillator; and
a bias optimizer that monitors the frequency control device and generates a bias voltage for the oscillator,wherein the oscillator includes a transfer function from bias voltage to frequency that is proportional to a transfer function from a low frequency noise component to frequency, the transfer function from bias voltage to frequency having a convex shape with a local minimum at which a sensitivity of the frequency to changes in the bias voltage is zero, and wherein the bias voltage from the bias optimizer is set to the local minimum.
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Abstract
A phase-locked loop circuit includes an oscillator, a frequency control device, the frequency control device generating a frequency control signal that controls a frequency of the oscillator, and a bias optimizer that monitors the frequency control device and generates a bias voltage for the oscillator, the oscillator includes a transfer function from bias voltage to frequency that is proportional to a transfer function from a low frequency noise component to frequency, the transfer function from bias voltage to frequency having a convex shape with a local minimum at which a sensitivity of the frequency to changes in the bias voltage is zero, and the bias voltage from the bias optimizer is set to the local minimum.
19 Citations
20 Claims
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1. A phase-locked loop (PLL) circuit comprising:
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an oscillator; a frequency control device, the frequency control device generating a frequency control signal that controls a frequency of the oscillator; and a bias optimizer that monitors the frequency control device and generates a bias voltage for the oscillator, wherein the oscillator includes a transfer function from bias voltage to frequency that is proportional to a transfer function from a low frequency noise component to frequency, the transfer function from bias voltage to frequency having a convex shape with a local minimum at which a sensitivity of the frequency to changes in the bias voltage is zero, and wherein the bias voltage from the bias optimizer is set to the local minimum. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for suppressing noise up-conversion, the method comprising:
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providing a phase-locked loop (PLL) circuit comprising; an oscillator; a frequency control device, the frequency control device generating a frequency control signal that controls a frequency of the oscillator; and a bias optimizer that monitors the frequency control device and generates a bias voltage for the oscillator, wherein the oscillator includes a transfer function from bias voltage to frequency that is proportional to a transfer function from a low frequency noise component to frequency, the transfer function from bias voltage to frequency having a convex shape with a local minimum at which a sensitivity of the frequency to changes in the bias voltage is zero; determining the local minimum of the transfer function from bias voltage to frequency; and setting the bias voltage from the bias optimizer to the local minimum. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification