Open-loop voltage regulation and drift compensation for digitally controlled oscillator (DCO)

摘要

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.

主权项

1. A circuit comprising:
a supply rail to receive a supply voltage; an open-loop voltage regulator coupled to the supply rail and including a transistor, the open-loop voltage regulator to provide a regulated voltage to a digital-controlled oscillator (DCO); a calibration circuit coupled to the open-loop voltage regulator, the calibration circuit to, during a calibration mode of the circuit, adjust a calibration voltage provided to the open-loop voltage regulator to provide the regulated voltage with a target value; wherein the calibration circuit is further 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; andif 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.