Digitally controlled oscillator with temperature compensation
First Claim
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1. A device comprising:
- a voltage reference supply, configured to provide a reference voltage that varies in response to temperature according to a predefined relationship;
a temperature sensor providing a temperature signal indicating a temperature;
a first controller configured to receive the temperature signal and to output a control signal, the first controller comprising;
a break point tracking module configured to compare the temperature signal with a bandgap reference voltage and to output a break point signal, wherein the bandgap reference voltage indicates a temperature break point, anda logic control circuit configured to output the control signal based on the temperature and the break point signal, whereinthe control signal increases in value as the temperature increases until the break point is reached,the control signal decreases in value as the temperature increases after the break point is reached;
an LC-DCO (digitally controlled oscillator) receiving the reference voltage and providing an output signal with a frequency from an inductor-capacitor (LCI circuit, the LC-DCO comprising a switched capacitor bank configured to provide temperature compensation by varying an effective capacitance in the LC circuit in response to the control signal.
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Abstract
A device comprising: a voltage reference supply, configured to provide a reference voltage that varies in response to temperature according to a predefined relationship; a temperature sensor providing a temperature signal indicating a temperature; a first controller configured to receive the temperature signal and to output a control signal; an LC-DCO receiving the reference voltage and providing an output signal with a frequency from an LC circuit, the LC-DCO comprising a switched capacitor bank configured to provide temperature compensation by varying an effective capacitance in the LC circuit in response to the control signal.
9 Citations
16 Claims
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1. A device comprising:
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a voltage reference supply, configured to provide a reference voltage that varies in response to temperature according to a predefined relationship; a temperature sensor providing a temperature signal indicating a temperature; a first controller configured to receive the temperature signal and to output a control signal, the first controller comprising; a break point tracking module configured to compare the temperature signal with a bandgap reference voltage and to output a break point signal, wherein the bandgap reference voltage indicates a temperature break point, and a logic control circuit configured to output the control signal based on the temperature and the break point signal, wherein the control signal increases in value as the temperature increases until the break point is reached, the control signal decreases in value as the temperature increases after the break point is reached; an LC-DCO (digitally controlled oscillator) receiving the reference voltage and providing an output signal with a frequency from an inductor-capacitor (LCI circuit, the LC-DCO comprising a switched capacitor bank configured to provide temperature compensation by varying an effective capacitance in the LC circuit in response to the control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of correcting a frequency variation in an output signal of a DCO (digitally controlled oscillator) in response to a temperature variation, comprising:
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receiving, by the DCO, a reference voltage that varies in response to temperature according to a predefined relationship; receiving, by the DCO, a control signal based on a temperature signal indicating a temperature and a break point signal indicating a temperature break point, wherein the control signal increases in value as the temperature increases until the break point is reached, and the control signal decreases in value as the temperature increases after the break point is reached; and providing, by the DCO, an output signal with a frequency from an inductor-capacitor (LC) circuit of the DCO, wherein the providing comprises; in response to the control signal, varying an effective capacitance in the LC circuit of the DCO using a switched capacitor bank to provide temperature compensation. - View Dependent Claims (14, 15, 16)
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Specification