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US 8,525,586 B2Granted
Gain stage with DC offset compensation and method thereof
AssigneeMediatek Inc.
InventorMu-Jung Chen
Life of this patent
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Abstract
A gain stage with DC offset compensation includes a gain amplifier and a compensation device. The gain amplifier is arranged to amplify an input signal according to a gain control signal. The compensation device is arranged to perform a DC offset compensation applied to the gain amplifier with an operating configuration based on the gain control signal.
Claims16
A gain stage with DC offset compensation, comprising:
- a gain amplifier, arranged to amplify an input signal according to a gain control signal;
- and
- a compensation device, arranged to perform a DC offset compensation applied to the gain amplifier with an operating configuration based on the gain control signal, comprising:
- a plurality of compensation units, at least one of the compensation units being selectively enabled according to the gain control signal, wherein the enabled compensation unit(s) performs the DC offset compensation;
- wherein when the gain control signal has a first gain value, a number of the enabled compensation units is equal to a first value, and when the gain control signal has a second gain value different from the first gain value, a number of the enabled compensation units is equal to a second value different from the first value.
2 more elements
A method of amplifying an input signal, comprising:
- utilizing a gain amplifier to amplify the input signal according to a gain control signal;
- and
- performing a DC offset compensation applied to the gain amplifier based on the gain control signal, comprising:
- selectively enabling at least one of the compensation units according to the gain control signal;
- and
- utilizing the enabled compensation unit(s) to perform the DC offset compensation;
- wherein when the gain control signal has a first gain value, a number of the enabled compensation units is equal to a first value, and when the gain control signal has a second gain value different from the first gain value, a number of the enabled compensation units is equal to a second value different from the first value.
4 more elements
A gain stage with DC offset compensation, comprising:
- a gain amplifier, arranged to amplify an input signal according to a gain control signal;
- a compensation device, arranged to perform a DC offset compensation applied to the gain amplifier, comprising:
- a first digital-to-analog converter (DAC), arranged to generate a first compensation signal for the DC offset compensation;
- and
- a second DAC, being selectively enabled according to the gain control signal, and arranged to generate a second compensation signal for the DC offset compensation when enabled.
2 more elements
Dependencies are inferred from the claim text.