Wireless transmitter DC offset recalibration
First Claim
1. A wireless transmitter comprising at least an amplifier configured to amplify an input signal, the amplifier connected to a circuit for the recalibration of a DC offset compensation of the amplifier 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;
wherein the incrementing and decrementing takes place as a last task prior to the entering of hibernation of the wireless transmitter.
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Accused Products
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.
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Citations
20 Claims
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1. A wireless transmitter comprising at least an amplifier configured to amplify an input signal, the amplifier connected to a circuit for the recalibration of a DC offset compensation of the amplifier 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;wherein the incrementing and decrementing takes place as a last task prior to the entering of hibernation of the wireless transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- circuitry for sensing an initial DC offset correction value for the system;
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8. 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 (9, 10, 11, 12, 13)
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14. 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; wherein the circuit for recalibration of the DC offset is further capable of receiving an indication of an intent to enter an hibernation state from the wireless transmitter. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification