Wireless transmitter DC offset recalibration
First Claim
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1. A circuit for the recalibration of a DC offset of a system comprising:
- circuitry for sensing an initial DC offset correction value for the system;
circuitry for storing the correction value;
circuitry for recalibration of the DC offset of the system using the correction value;
circuitry for comparing the present DC offset of the system to a predetermined value; and
, circuitry for incrementing and decrementing the content of the circuitry for storing responsive to an output of the circuitry for comparing.
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Abstract
In many circuits, including those operating in radio frequency (RF), there is commonly a need to perform DC offset cancellation. The DC offset is an error in an output signal in respect to the input that may cause a circuit to enter into undesirable or non-tolerable conditions of operation. While in most cases a static solution is provided the use of an analog loop may be inappropriate because of the adverse impact on speed. By adding a fast feedback loop finely impacting the adjustment of an amplifier, both the initial calibration is achieved as well as a recalibration of the system.
19 Citations
26 Claims
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1. A circuit for the recalibration of a DC offset of a system comprising:
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circuitry for sensing an initial DC offset correction value for the system;
circuitry for storing the correction value;
circuitry for recalibration of the DC offset of the system using the correction value;
circuitry for comparing the present DC offset of the system to a predetermined value; and
,circuitry for incrementing and decrementing the content of the circuitry for storing responsive to an output of the circuitry for comparing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for the recalibration of a DC offset of a system comprising:
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determining an initial DC offset cancellation value for the system;
storing the cancellation value in a register;
recalibrating the DC offset of the system using the correction value;
determining if the system is about to enter a hibernation mode and if not, waiting until the system is about to enter hibernation;
if the system is about to enter the hibernation mode, comparing the present DC offset value to a predetermined value and incrementing or decrementing the stored cancellation value responsive to the comparison. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A wireless transmitter capable of recalibration of DC offset, the circuit for recalibration of DC offset comprising:
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means for determining an initial DC offset correction value for the transmitter;
means for storing the correction value;
means for recalibrating the DC offset of the transmitter using the correction value;
means for comparing a present DC offset of the transmitter to a predetermined value; and
,means for incrementing or decrementing the stored cancellation value responsive to the comparison. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification