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US 8,175,208 B2Granted
Method of reducing d.c. offset
AssigneeFuture Waves UK Limited
InventorMark Dawkins
Life of this patent
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Abstract
A method of reducing d.c. offset comprises comparing the a first variable signal with a second variable signal, producing a control signal in dependence upon the comparison, providing the control signal to a charge pump for generation of a feedback signal, and varying the first signal and/or the second signal in dependence upon the feedback signal thereby reducing any difference between the d.c. level of the first signal and the d.c. level of the second signal.
Claims22
A method of reducing d.c. offset, the method comprising:
- comparing a variable first signal with a variable second signal;
- producing a control signal dependent upon the comparison;
- providing the control signal to a charge pump for generation of a feedback signal;
- producing the feedback signal in dependence upon at least one earlier value of the feedback signal as well as in dependence upon the comparison;
- and varying the first signal and/or the second signal in dependence upon the feedback signal thereby to reduce any difference between the d.c. level of the first signal and the d.c. level of the second signal.
2 more elements
Apparatus for reducing d.c. offset, comprising:
- amplification means adapted to vary a variable first signal and/or a variable second signal;
- means adapted to compare the first signal and the second signal and to produce a control signal in dependence upon the comparison;
- and means for producing a feedback signal and for passing the feedback signal back to the amplification means, wherein the means for producing a feedback signal is adapted to producing the feedback signal in dependence upon at least one earlier value of the feedback signal as well as in dependence upon the comparison, the means for producing the feedback signal being further adapted to receive the control signal and including a charge pump;
- the amplification means being further adapted to receive the feedback signal and to vary the first signal and/or the second signal in dependence on the feedback signal so as to reduce any difference between the d.c. level of the first signal and the d.c. level of the second signal.
1 more element
Dependencies are inferred from the claim text.