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US 2013/0257397 A1Published application
Current Calibration Method and Associated Circuit
AssigneeMStar Semiconductor, Inc.
InventorsChih-Tien Chang, Ju-Ming Chou
Life of this patent
Estimating the term…
Abstract
A current calibration method and the associated control circuit are provided. The method includes: providing a predetermined voltage to the differential output for obtaining an accurate current passing through the panel resistor during a calibration procedure and, providing a driving current to the differential output according to the accurate current during a normal operation procedure.
Claims19
A control circuit, capable of calibrating a current, comprising:
- an adjustable current generator that converts a reference current into a driving current according to a current control signal;
- an output driver, with a differential output connected to an external precision resistor, that receives the driving current and generates a differential signal at the differential output utilizing the driving current according to a data signal;
- a comparison apparatus, coupled to the output driver, that generates a comparison output signal according to a reference voltage and the differential signal;
- and
- a processing circuit that controls the current control signal according to the comparison output signal to calibrate the driving current,
- wherein the comparison apparatus comprises a comparator having a first input that receives the reference voltage and a second input that receives a single-ended signal of the differential signal, and
- wherein the comparator compares the reference voltage with the single-ended signal to generate the comparison output signal.
4 more elements
A current calibration method, comprising:
- providing a reference voltage;
- generating a driving current according to a reference current and a current control signal;
- generating a differential signal by utilizing the driving current according to a data signal;
- generating a comparison output according to the reference voltage and the differential signal;
- and
- controlling the current control signal to calibrate a magnitude of the driving current according to the comparison output.
3 more elements
A current calibration method, comprising:
- providing a predetermined voltage to a differential output to obtain an accurate current passing through a precision resistor during a calibration procedure;
- and
- providing a driving current to the differential output according to the accurate current during a normal operation procedure.
Dependencies are inferred from the claim text.