Open-loop voltage regulation and drift compensation for digitally controlled oscillator (DCO)
First Claim
1. A circuit comprising:
- a digital-controlled oscillator (DCO);
an open-loop voltage regulator coupled to the DCO, the open-loop voltage regulator to provide a regulated voltage to the digital-controlled oscillator (DCO) based on a calibration voltage, wherein the open-loop voltage regulator includes;
a transistor having a drain terminal coupled to the DCO to provide the regulated voltage; and
a low-pass resistance-capacitance (RC) filter coupled to a gate terminal of the transistor; and
a calibration circuit coupled to the open-loop voltage regulator, the calibration circuit to;
receive a digital tuning code that is used to tune an output frequency of the DCO;
determine if the tuning code is outside a pre-determined range of tuning codes; and
if the tuning code is outside the pre-determined range of tuning codes, adjust the calibration voltage so that the tuning code is inside the pre-determined range of tuning codes.
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Abstract
Embodiments include apparatuses, methods, and systems for open-loop voltage regulation and drift compensation for a digitally controlled oscillator (DCO). In embodiments, a communication circuit may include a DCO, an open-loop voltage regulator, and a calibration circuit. The open-loop voltage regulator may receive a calibration voltage and may generate a regulated voltage. The regulated voltage may be passed to the DCO. During a calibration mode, the calibration circuit may compare the regulated voltage to a reference voltage and adjust the calibration voltage based on the comparison to provide the regulated voltage with a target value. During a monitoring mode, the calibration circuit may receive a tuning code that is used to tune the DCO and further adjust the calibration voltage based on a value of the tuning code.
10 Citations
19 Claims
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1. A circuit comprising:
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a digital-controlled oscillator (DCO); an open-loop voltage regulator coupled to the DCO, the open-loop voltage regulator to provide a regulated voltage to the digital-controlled oscillator (DCO) based on a calibration voltage, wherein the open-loop voltage regulator includes; a transistor having a drain terminal coupled to the DCO to provide the regulated voltage; and a low-pass resistance-capacitance (RC) filter coupled to a gate terminal of the transistor; and a calibration circuit coupled to the open-loop voltage regulator, the calibration circuit to; receive a digital tuning code that is used to tune an output frequency of the DCO; determine if the tuning code is outside a pre-determined range of tuning codes; and if the tuning code is outside the pre-determined range of tuning codes, adjust the calibration voltage so that the tuning code is inside the pre-determined range of tuning codes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising:
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means for comparing a regulated voltage with a reference voltage, wherein the regulated voltage is provided to a digitally controlled oscillator (DCO) by an open-loop voltage regulator, wherein the open-loop voltage regulator includes; a transistor having a drain terminal coupled to the DCO to provide the regulated voltage; and a low-pass resistance-capacitance (RC) filter coupled to a gate terminal of the transistor; means for adjusting, based on the comparison, a calibration voltage provided to the open-loop voltage regulator to provide the regulated voltage with a target value; means for monitoring drift of a tuning code that is used to tune the DCO; and means for further adjusting the calibration voltage based on the monitored drift to maintain a value of the tuning code within a pre-determined range. - View Dependent Claims (9, 10, 11, 12)
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13. A system comprising:
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a processor; and a communication circuit coupled to the processor, the communication circuit including; a digitally controlled oscillator (DCO); an open-loop voltage regulator to receive a calibration voltage and to provide a regulated voltage to the DCO based on the calibration voltage, wherein the open-loop voltage regulator includes; a transistor, wherein a drain terminal of the transistor is coupled to the DCO to provide the regulated voltage; and a low-pass filter coupled to a gate terminal of the transistor; and a calibration circuit coupled to the open-loop voltage regulator, the calibration circuit to; during a calibration mode, compare the regulated voltage to a reference voltage and adjust the calibration voltage, based on the comparison, to provide the regulated voltage with a pre-determined target voltage value; and during a monitoring mode, receive a tuning code that is used to tune the DCO and further adjust the calibration voltage based on a value of the tuning code. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification