Method and system for calibration of a voltage controlled oscillator (VCO)
First Claim
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1. A method for calibrating a voltage controlled oscillator (VCO) comprising:
- providing a serial resistance ladder having a plurality of equal resistors;
applying a plurality of known voltages to the input of a VCO, wherein the known voltages are available from between each of the resistors;
monitoring, for each of the voltages, an output count from the VCO over a set interval; and
storing the output counts for each voltage.
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Abstract
A method for calibrating a voltage controlled oscillator (VCO) comprising applying a plurality of known voltages to the input of a VCO, monitoring, for each of the voltages, an output count from the VCO over a set interval, and storing the output counts for each voltage. Also disclosed is a system for calibrating a voltage controlled oscillator (VCO) comprising a plurality of known voltages, wherein the known voltage are connectable to the VCO, and a controller coupled to the output of the VCO, wherein the controller maintains a calibration table of VCO output counts for selected voltage inputs.
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Citations
14 Claims
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1. A method for calibrating a voltage controlled oscillator (VCO) comprising:
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providing a serial resistance ladder having a plurality of equal resistors; applying a plurality of known voltages to the input of a VCO, wherein the known voltages are available from between each of the resistors; monitoring, for each of the voltages, an output count from the VCO over a set interval; and
storing the output counts for each voltage. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for calibrating a voltage controlled oscillator (VCO) comprising:
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a plurality of known voltages, wherein the known voltage are connectable to the VCO; and a controller coupled to the output of the VCO, wherein the controller maintains a calibration table of VCO output counts, monitored over a set interval, for selected voltage inputs; and a resistance ladder having a plurality of voltage taps, wherein the voltage taps provide the known voltages. - View Dependent Claims (8, 9)
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10. A computer program product comprising a computer usable medium having computer readable program code embedded therein, the computer readable program code comprising:
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code for selecting a voltage to be applied to inputs of a plurality of voltage controlled oscillators (VCOs), wherein the voltage is selected from one of a plurality of voltage taps on a serial resistance ladder, wherein the voltage taps provide known voltages; code for monitoring output counts from each of the plurality of VCOs over a set period of time, while the selected voltage is applied to the VCOs'"'"' inputs; and code for storing, for each of the plurality of VCOs, a table of output counts associated with the selected voltage. - View Dependent Claims (11)
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12. A system for calibrating a voltage controlled oscillator (VCO) comprising:
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means for applying a plurality of known voltages to the input of a VCO; means for monitoring, for each of the voltages, an output count from the VCO over a set interval; means for storing the output counts for each voltage; means for applying an unknown voltage to the VCO input, wherein the unknown voltage is measured across a sense resistor with a known resistance; means for monitoring an unknown output count from the VCO over a set interval; and means for determining the value of the unknown voltage by relating it to a known voltage that has an equivalent output count; and means for calculating a current through the sense resistor using the known resistance and a value determined for the unknown voltage. - View Dependent Claims (13, 14)
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Specification