Oscillator including varactor circuit and method of operation thereof
First Claim
1. An oscillator, comprising:
- a control voltage generator configured to generate a control voltage based on dividing a power voltage that was received;
an offset voltage generator configured to generate an offset voltage based on dividing the power voltage that was received;
a phase locked loop (PLL) comprising a varactor circuit configured to modify a capacitance based on the control voltage and the offset voltage, wherein the PLL is configured to output an oscillation signal comprising an oscillation frequency based on the capacitance; and
a calibration logic circuit configured to provide a selection control signal to the control voltage generator based on the oscillation signal, and configured to provide an offset control signal to the offset voltage generator based on the oscillation signal,wherein the calibration logic circuit comprises;
a register configured to store frequency information associated with the oscillation signal;
a calculation logic circuit configured to calculate a first value based on the frequency information stored in the register;
a comparator circuit configured to provide a result signal responsive to determining whether the first value is greater than a reference value; and
a control logic circuit configured to output the selection control signal and the offset control signal based on the result signal from the comparator circuit.
1 Assignment
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Accused Products
Abstract
An oscillator and method for operation of the oscillator are provided. The oscillator includes a control voltage generator configured to generate a control voltage based on dividing a power voltage that was received, an offset voltage generator configured to generate an offset voltage based on dividing the power voltage that was received, a phase locked loop (PLL) including a varactor circuit configured to modify a capacitance based on the control voltage and the offset voltage, and a calibration logic circuit configured to provide a selection control signal to the control voltage generator based on the oscillation signal, and configured to provide an offset control signal to the offset voltage generator based on the oscillation signal.
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Citations
19 Claims
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1. An oscillator, comprising:
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a control voltage generator configured to generate a control voltage based on dividing a power voltage that was received; an offset voltage generator configured to generate an offset voltage based on dividing the power voltage that was received; a phase locked loop (PLL) comprising a varactor circuit configured to modify a capacitance based on the control voltage and the offset voltage, wherein the PLL is configured to output an oscillation signal comprising an oscillation frequency based on the capacitance; and a calibration logic circuit configured to provide a selection control signal to the control voltage generator based on the oscillation signal, and configured to provide an offset control signal to the offset voltage generator based on the oscillation signal, wherein the calibration logic circuit comprises; a register configured to store frequency information associated with the oscillation signal; a calculation logic circuit configured to calculate a first value based on the frequency information stored in the register; a comparator circuit configured to provide a result signal responsive to determining whether the first value is greater than a reference value; and a control logic circuit configured to output the selection control signal and the offset control signal based on the result signal from the comparator circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of operating of an oscillator comprising a phase locked loop that is configured to generate an oscillation signal, wherein the phase locked loop comprises a varactor circuit, the method comprising:
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acquiring frequency information associated with the oscillation signal by applying a plurality of control voltages to the varactor circuit, wherein the varactor circuit is configured to modify a capacitance based on a control voltage and an offset voltage; modifying the offset voltage based on the frequency information; and applying the offset voltage to the varactor circuit responsive to the modifying the offset voltage, wherein the varactor circuit is in a fixed offset voltage state under a calibration mode. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of operating of an oscillator, the method comprising:
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applying a control voltage, based on a selection control signal and an offset signal responsive to a offset control signal, to a varactor circuit provided in a phase locked loop under a calibration mode; changing the selection control signal into different levels based on an oscillation signal from the phase locked loop; acquiring frequency information based on the oscillation signal from the phase locked loop; determining a first value based on the frequency information; determining whether to change the offset control signal based on the first value; and determining an offset voltage to be applied to the varactor circuit based on the offset control signal. - View Dependent Claims (18, 19)
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Specification