Calibration circuit apparatus and method
AssigneeIntel Corporation
InventorsCho-Ying Lu, Chun Lee, Jad B. Rizk
Life of this patent
Estimating the term…
Abstract
Embodiments of a calibration circuit for a current source which may include a first control switch, a second control switch, and a capacitor. In embodiments, the first control switch may be operable to couple the capacitor to the current source and the second control switch may be operable to couple the capacitor to a reference current source to enable the capacitor to be charged or discharged according to a first control signal provided to the first control switch and a second control signal provided to the second control switch. In embodiments, the calibration circuit may be included in a digital-to-analog (DAC) converter.
Claims22
A circuit for calibrating a current source, comprising:
- a first control switch;
- a second control switch;
- a capacitor, wherein the first control switch is operable to couple the capacitor to the current source and the second control switch is operable to couple the capacitor to a reference current source to enable the capacitor to be charged or discharged according to a first control signal provided to the first control switch and a second control signal provided to the second control switch;
- and
- a calibration current source configured to provide a current, based on a difference between an accumulated charge in the capacitor and an expected charge in the capacitor, to compensate for a difference between the current source and the reference current source.
(canceled)
An apparatus, comprising:
- a plurality of current sources;
- a calibration circuit, coupled to the plurality of current sources, to calibrate a first current source of the plurality of current sources, wherein the calibration circuit includes:
- a reference current source;
- a capacitor coupled to the reference current source and the first current source, wherein the first current source is coupled to the capacitor via a first control switch and the reference current source is coupled to the capacitor via a second control switch to allow the capacitor to be charged or discharged according to a first control signal of the first control switch and a second control signal of the second control switch;
- and
- a first and a second comparator coupled to an output of the capacitor.
(canceled)
A method, comprising:
- charging a capacitor via a first current source according to a first control signal controlling a first on-time duration of a first control switch;
- discharging the capacitor via a second current source according to a second control signal controlling a second on-time duration of a second control switch;
- determining an amount of charge remaining in the capacitor after the charging and the discharging of the capacitor;
- and
- determining a compensation current, based on a difference between the amount of charge remaining in the capacitor and an expected charge in the capacitor, to compensate for a difference between the first current source and the second current source.
A system, comprising:
- a memory having computer-executable instructions stored thereon;
- a processor coupled to the memory and configured to execute the stored computer-executable instructions to cause a generation of a digital signal;
- and
- a communication interface coupled to the processor, the communication interface including a device to convert the digital signal to an analog signal, wherein the device includes a circuit to calibrate a current source of the device, the circuit including:
- a first control switch;
- a second control switch;
- and
- a capacitor, wherein the first control switch is operable to couple the capacitor to the current source and the second control switch is operable to couple the capacitor to a reference current source to enable the capacitor to be charged or discharged according to a first control signal provided to the first control switch and a second control signal provided to the second control switch;
- and
- a calibration current source configured to provide a compensation current, based on a difference between an accumulated charge in the capacitor and an expected charge in the capacitor, to compensate for a difference between the current source and the reference current source.
(canceled)
Dependencies are inferred from the claim text.