Dc offset calibration apparatus
AssigneeMediatek Inc.
InventorsChinq-Shiun Chiu, Chih-Hsien Shen, Shou-Tsung Wang, Chi-Kun Chiu
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Abstract
A DC offset calibration device for calibrating a DC offset of an output signal of a gain stage, the DC offset calibration device includes: a digital-to-analog converter (DAC) electrically connected to the gain stage for generating an offset current according to the DC offset of the output signal of the gain stage; and a current-to-current converter electrically connected to the DAC and the gain stage for reducing the signal scale of the offset current to generate a compensation signal so as to reduce the DC offset at the output of the gain stage.
Claims23
A device for calibrating a DC offset of a gain stage, the device comprising:
- a digital-to-analog converter (DAC) coupled to an output of the gain stage for converting a digital control signal to an offset current, wherein the digital control signal is in response to a DC offset at the output of the gain stage;
- and
- a current-to-current converter coupled between the DAC and an input of the gain stage for converting and reducing the signal scale of the offset current to form a compensation signal.
A device for calibrating a DC offset of a gain stage, the device comprising:
- a digital-to-analog converter (DAC) for converting a digital control signal to an offset current, wherein the digital control signal is in response to a DC offset of an output of the gain stage;
- a first current-to-current converter coupled between the DAC and a first input of the gain stage for converting and reducing the signal scale of the offset current to form a first compensation signal;
- and
- a second current-to-current converter coupled to a second input of the gain stage for converting a reference current to a second compensation signal.
A device for calibrating a DC offset of a gain stage, the device comprising:
- a first digital-to-analog converter (DAC) coupled to an output of the gain stage for converting a digital control signal to a first offset current, wherein the digital control signal is in response to a DC offset of the output of the gain stage;
- a first current-to-current converter coupled between the first DAC and a first input of the gain stage for converting and reducing the signal scale of the first offset current to form a first compensation signal;
- a second DAC coupled to the output of the gain stage for converting a digital control signal to a second offset current, wherein the digital control signal is in response to a DC offset of the output of the gain stage;
- and
- a second current-to-current converter coupled between the second DAC and a second input of the gain stage for converting and reducing the signal scale of the second offset current to form a second compensation signal.
Dependencies are inferred from the claim text.