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US 2008/0187073 A1Published application
Transmitter Apparatus
AssigneeKoninklijke Philips Electronics N.V.
InventorsAlexander Lampe, Rainer Dietsch
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AssigneeKoninklijke Philips Electronics N.V.
InventorsAlexander Lampe, Rainer Dietsch
Estimating the term…
A transmitter apparatus (1) comprises a digital modulator (2), wherein the modulator is adapted to output a digital in-phase signal and a digital quadrature signal. The digital in-phase signal is converted to an analog in-phase signal and further processed in a path (31) for the in-phase signal, and a digital quadrature signal is converted in an analog quadrature signal and further processed in a path (34) for the quadrature signal. Thereby, an amplitude and delay mismatch in the path can occur. With the transmitter apparatus (1) of the invention the amplitude and delay mismatch can be measured. Further, an amplitude correction unit (43) is adapted for correcting the amplitude mismatch and a delay unit (3) is adapted to correct the delay mismatch. Further refinements of the amplitude and delay mismatch can be made with one or more predetermined test signals generated by a test signal generating unit (30).
Transmitter apparatus, especially baseband transmitter for a wireless communications system, which transmitter apparatus comprises a digital modulator, a delay, a first digital to analog converter and at least a second digital to analog converter, wherein said modulator is adapted to receive at least a digital signal and to output at least a digital in-phase signal and at least a digital quadrature signal, said first converter is adapted to convert said digital in-phase signal output from said modulator to at least an analog in-phase signal, said second converter is adapted to convert said digital quadrature signal output from said modulator to at least an analog quadrature signal, and said delay unit is adapted to add a time shift to said digital quadrature signal relative to said digital in-phase signal.
Method for measuring and compensating a signal imbalance, especially an amplitude and/or delay imbalance, which method comprises:
feeding a first predetermined digital test signal to a digital in-phase and quadrature modulator of a transmitter apparatus;
Dependencies are inferred from the claim text.