Compensation of a DC offset in a receiver
First Claim
1. A method comprising:
- determining an amount of a direct-current offset present at a selected end point in a receiving path of a receiver, in which receiving path at least one gain factor is adjustable by a gain control, and setting a compensation quantity accordingly;
exclusively in the case of a forthcoming adjustment of said at least one gain factor by said gain control, scaling said compensation quantity with a scaling factor to prevent a direct-current step at said selected end point due to said forthcoming adjustment of said at least one gain factor; and
feeding said compensation quantity at a selected summing node into said receiving path to compensate for a direct-current offset coupled into said receiving path,wherein said direct-current offset comprises at least a first contribution and a second contribution, said first contribution being multiplied on said receiving path at least by a first adjustable gain factor and said second contribution being multiplied on said receiving path by a second adjustable gain factor,wherein said first contribution and said second contribution are estimated, andwherein said scaling factor is determined based on said estimated first contribution, said estimated second contribution and said forthcoming adjustment of said at least one gain factor.
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Accused Products
Abstract
A method of compensating a direct-current offset coupled into a receiving path of a receiver, the receiving path having at least one gain factor adjustable by a gain control, which method first determines an amount of a direct-current offset present at a selected end point in the receiving path. A compensation quantity is set accordingly. In case of a forthcoming adjustment of the at least one gain factor by the gain control, the compensation quantity is then scaled with a scaling factor to prevent a direct-current step at the selected end point due to this forthcoming adjustment. The final compensation quantity is fed at a selected summing node into the receiving path. The invention is also directed to a corresponding receiver, an electronic device comprising such a receiver, a hardware component for such a receiver and to a corresponding software program product.
25 Citations
25 Claims
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1. A method comprising:
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determining an amount of a direct-current offset present at a selected end point in a receiving path of a receiver, in which receiving path at least one gain factor is adjustable by a gain control, and setting a compensation quantity accordingly; exclusively in the case of a forthcoming adjustment of said at least one gain factor by said gain control, scaling said compensation quantity with a scaling factor to prevent a direct-current step at said selected end point due to said forthcoming adjustment of said at least one gain factor; and feeding said compensation quantity at a selected summing node into said receiving path to compensate for a direct-current offset coupled into said receiving path, wherein said direct-current offset comprises at least a first contribution and a second contribution, said first contribution being multiplied on said receiving path at least by a first adjustable gain factor and said second contribution being multiplied on said receiving path by a second adjustable gain factor, wherein said first contribution and said second contribution are estimated, and wherein said scaling factor is determined based on said estimated first contribution, said estimated second contribution and said forthcoming adjustment of said at least one gain factor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising:
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a direct-current estimation portion adapted to estimate an amount of a direct-current offset present at a selected end point in a receiving path, in which receiving path at least one gain factor is adjustable by a gain control, adapted to set a compensation quantity accordingly, adapted to scale said compensation quantity with a provided scaling factor, if any, and adapted to feed said compensation quantity into said receiving path at a selected summing node to compensate for a direct-current offset coupled into said receiving path; and a direct-current compensation control portion adapted to determine exclusively in the case of a forthcoming adjustment of said at least one gain factor a scaling factor preventing a direct-current step at said selected end point due to said forthcoming adjustment of said at least one gain factor, and adapted to provide said scaling factor to said direct-current estimation portion, wherein said direct-current offset comprises at least a first contribution and a second contribution, said first contribution being multiplied on said receiving path at least by a first adiustable gain factor and said second contribution being multiplied on said receiving path by a second adiustable gain factor, wherein said first contribution and said second contribution are estimated, and wherein said scaling factor is determined based on said estimated first contribution, said estimated second contribution and said forthcoming adiustment of said at least one gain factor. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. An electronic device including a receiver, which receiver comprises:
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a receiving path, in which receiving path at least one gain factor is adjustable by a gain control, wherein a direct-current offset coupled into said receiving path is to be compensated; a direct-current estimation portion adapted to determine an amount of said direct-current offset present at a selected end point in said receiving path, adapted to set a compensation quantity accordingly, adapted to scale said compensation with a provided scaling factor, if any, and adapted to feed said compensation quantity at a selected summing node into said receiving path; and a direct current compensation control portion adapted to determine exclusively in the case of a forthcoming adjustment of said at least one gain factor a scaling factor preventing a direct-current step at said selected end point due to said forthcoming adjustment of said at least one gain factor, and adapted to provide said scaling factor to said direct-current estimation portions, wherein said direct-current offset comprises at least a first contribution and a second contribution, said first contribution being multiplied on said receiving path at least by a first adiustable gain factor and said second contribution being multiplied on said receiving path by a second adiustable gain factor, wherein said first contribution and said second contribution are estimated, and wherein said scaling factor is determined based on said estimated first contribution, said estimated second contribution and said forthcoming adiustment of said at least one gain factor. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A hardware component for a receiver comprising a receiving path, in which receiving path at least one gain factor is adjustable by a gain control, wherein a direct-current offset coupled into said receiving path is to be compensated, said hardware component comprising:
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a direct-current estimation portion adapted to estimate an amount of said direct-current offset present at a selected end point in said receiving path, adapted to set a compensation quantity accordingly, adapted to scale said compensation quantity with a provided scaling factor, if any, and adapted to feed said compensation quantity into said receiving path at a selected summing node; and a direct-current compensation control portion adapted to determine exclusively in the case of a forthcoming adjustment of said at least one gain factor a scaling factor preventing a direct-current step at said selected end point due to said forthcoming adjustment of said at least one gain factor, and adapted to provide said scaling factor to said direct-current estimation portion, wherein said direct-current offset comprises at least a first contribution and a second contribution, said first contribution being multiplied on said receiving path at least by a first adjustable gain factor and said second contribution being multiplied on said receiving oath by a second adjustable gain factor, wherein said first contribution and said second contribution are estimated. and wherein said scaling factor is determined based on said estimated first contribution, said estimated second contribution and said forthcoming adjustment of said at least one gain factor.
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23. A software program product comprising a computer readable medium in which a software code is stored, said software code realizing the following when being executed:
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determining an amount of a direct-current offset present at a selected end point in a receiving path, in which receiving path at least one gain factor is adjustable by a gain control, and setting a compensation quantity accordingly; exclusively in the case of a forthcoming adjustment of said at least one gain factor by said gain control, scaling said compensation quantity with a scaling factor to prevent a direct-current step at said selected end point due to said forthcoming adjustment of said at least one gain factor; and providing said compensation quantity for feeding into said receiving path at a selected summing node to compensate for a direct-current offset coupled into said receiving paths, wherein said direct-current offset comprises at least a first contribution and a second contribution, said first contribution being multiplied on said receiving path at least by a first adjustable gain factor and said second contribution being multiplied on said receiving path by a second adjustable gain factor, wherein said first contribution and said second contribution are estimated, and wherein said scaling factor is determined based on said estimated first contribution, said estimated second contribution and said forthcoming adjustment of said at least one gain factor.
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24. An apparatus comprising:
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means for determining an amount of a direct-current offset present at a selected end point in a receiving path of a receiver, in which receiving path at least one gain factor is adjustable by a gain control, and setting a compensation quantity accordingly; means for scaling said compensation quantity with a scaling factor exclusively in the case of a forthcoming adjustment of said at least one gain factor by said gain control to prevent a direct-current step at said selected end point due to said forthcoming adjustment of said at least one gain factor; and means for feeding said compensation quantity at a selected summing node into said receiving path to compensate for a direct-current offset coupled into said receiving path, wherein said direct-current offset comprises at least a first contribution and a second contribution, said first contribution being multiplied on said receiving path at least by a first adjustable gain factor and said second contribution being multiplied on said receiving path by a second adjustable pain factor, wherein said first contribution and said second contribution are estimated, and wherein said scaling factor is determined based on said estimated first contribution, said estimated second contribution and said forthcoming adjustment of said at least one gain factor. - View Dependent Claims (25)
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Specification