Voltage controlled oscillator
First Claim
Patent Images
1. A method of centering an operating band of a voltage controlled oscillator about a desired operating frequency comprising:
- a) determining a mid-point frequency of said operating band;
b) comparing said mid-point frequency to said desired operating frequency; and
c) adjusting a capacitance of said voltage controlled oscillator according to said comparison in said b).
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Abstract
Embodiments of the present invention provide a method of centering an operating band of a voltage controlled oscillator around a desired operating frequency. In one embodiment, an adjustable feedback divider provides for driving an output signal to the top and bottom of the operating band. An adjustable period divider and counter provide a plurality of count values for use in determining a mid-point of the operating band. A capacitance bank provides for selectively adjusting a capacitance of the voltage controlled oscillator, thereby adjusting the operating band.
91 Citations
20 Claims
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1. A method of centering an operating band of a voltage controlled oscillator about a desired operating frequency comprising:
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a) determining a mid-point frequency of said operating band;
b) comparing said mid-point frequency to said desired operating frequency; and
c) adjusting a capacitance of said voltage controlled oscillator according to said comparison in said b). - View Dependent Claims (2, 3, 4, 5)
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6. A voltage controlled oscillator comprising:
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an adjustable feedback divider coupled to an output of said voltage controlled oscillator and a first output of a control logic;
an adjustable period divider coupled to an output of said adjustable feedback divider and a second output of said control logic;
a counter coupled to an output of said adjustable period divider and an output of a reference clock generator; and
wherein said control logic is coupled to an output of said counter. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method of centering an operating band of a phase lock loop voltage controlled oscillator about a desired operating frequency comprising:
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a) determining an expected count;
b) determining an actual count;
c) increasing a capacitance of said voltage controlled oscillator when said actual count is less than said expected count; and
d) decreasing a capacitance of said voltage controlled oscillator when said actual count is greater than said expected count. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification