DC offset cancellation
AssigneeBerkana Wireless, Inc.
InventorSung-ho Wang
Life of this patent
Estimating the term…
Abstract
DC offset canceling is disclosed. A DC level fixing signal generator receives feedback input of two output signals from a mixer and generates a level fixing control signal to fix the DC level of the two output signals according to the input values. A DC offset canceling signal generator receives feedback input of two output signals from the mixer and generates offset canceling control signals to cancel the relative difference between the DC levels of the two output signals according to the input values. A DC level fixing and offset canceling circuit fixes the DC level of each of the two output signals from the mixer and cancels the relative difference between the DC levels of the two output signals according to the level fixing control signal and the offset canceling control signals.
Claims6
A DC offset canceller including:
- a DC level fixing signal generator that receives feedback input of two output signals from a mixer and generates a level fixing control signal to fix the DC level of the two output signals according to the input values;
- a DC offset canceling signal generator that receives feedback input of two output signals from the mixer and generates offset canceling control signals to cancel the relative difference between the DC levels of the two output signals according to the input values;
- and
- a DC level fixing and offset canceling circuit that fixes the DC level of each of the two output signals from the mixer and cancels the relative difference between the DC levels of the two output signals according to the level fixing control signal and the offset canceling control signals.
A method of correcting DC offset between output signals output from a mixer including:
- fixing the DC levels of the two signals output from the mixer;
- detecting the two DC levels that are fixed as above;
- and
- canceling an offset between the DC levels of the two signals output from the mixer by lowering the level of the relatively high DC and raising the level of the relatively low DC on the basis of the relative difference between the two DC levels.
Dependencies are inferred from the claim text.