Apparatus for removing DC components inherent in a radio frequency chain

摘要

Device for compensating a DC component inherent in any radio frequency chain in which from a single measurement, generally obtained from a digital stage, a set of multiple compensation values is determined by a compensation value vector generating module and which compensation values are applied to multiple compensation points of the analog chain. The compensation values are calculated by an iterative process converging toward cancellation of the DC component and avoid saturating amplification components and components of the analog-to-digital converter. The module includes compensation value calculation units each configured to calculate a respective compensation value and provide the calculated compensation value to the respective compensation point.

主权项

1. A radio frequency signal reception device, comprising:
at least one analog stage into which a DC component in a signal passing through the analog stage is present, each of the at least one analog stage having compensation points at each of which a compensation DC signal is added from digital-to-analog conversion of a compensation value in order to cancel a DC component measured at an end of the at least one analog stage; and a module that produces the compensation DC signals that are added to the compensation points of the at least one analog stage; the module being configured to:
calculate an approximate gain vector with a number of components corresponding to the number of compensation points, each component being based on gain and attenuation values of analog components located downstream of the corresponding compensation point in the at least one analog stage;calculate a corresponding unit gain vector by dividing the approximate gain vector by its Euclidean norm;calculate a first term representing a value to be compensated divided by the gain vector norm and multiplying a product of this result with the unit gain vector;calculate a new compensation vector by adding a second term to the first term, the second term being a current compensation vector or a scalar product of the current compensation vector with the unit gain vector multiplied by the unit gain vector; andlimiting each value of the new compensation vector to a maximum admissible value of a corresponding digital-to-analog converter used to generate a corresponding compensation signal.