US 2003/0169827 A1 · Self-calibrating direct conversion transmitter

Abstract

A self-calibrating transmitter includes an up-conversion mixing module, summing module, calibration determination module, and a calibration execution module. The up-conversion mixing module is operably coupled to mix an I component of a base-band signal with an I component of a local oscillation to produce a mixed I signal and is also operably coupled to mix a Q component of the base-band signal with a Q component of the local oscillation to produce a mixed Q signal. The summing module sums the mixed I signal with the mixed Q signal to produce a modulated radio frequency (RF) signal. The calibration determination module is operably coupled to produce a calibration signal, which it generates by interpreting the local oscillation and the modulated RF signal. The calibration execution module is operably coupled to calibrate the DC level of the I and/or Q component of the base-band signal, and/or the gain of the I and/or Q component of the base-band signal based on the calibration signal.

Claims34

Dependent claims

A self-calibrating direct conversion transmitter, wherein the transmitter comprises:

up-conversion mixing module that mixes an I component of a baseband signal with an I component of a local oscillation to produce a mixed I signal and mixes a Q component of the baseband signal with a Q component of the local oscillation to produce a mixed Q signal;
summing module that sums the mixed I signal with the mixed Q signal to produce a modulated radio frequency (RF) signal;
calibration determination module operably coupled to produce a calibration signal based on an interpretation of the local oscillation and the modulated RF signal;
and
calibration execution module operably coupled to calibrate at least one of:
DC level of the I component of the baseband signal, DC level of the Q component of the baseband signal, gain of the I component of the baseband signal, and gain of the Q component of the baseband signal based on the calibration signal such that the imbalance within the transmitter is reduced.

3 more elements

A method for a self-calibrating direct conversion transmitter, the method comprises:

mixing an I component of a baseband signal with an I component of a local oscillation to produce a mixed I signal
mixing a Q component of the baseband signal with a Q component of the local oscillation to produce a mixed Q signal;
summing the mixed I signal with the mixed Q signal to produce a modulated radio frequency (RF) signal;
producing a calibration signal based on an interpretation of the local oscillation and the modulated RF signal;
and
calibrating at least one of:
DC level of the I component of the baseband signal, DC level of the Q component of the baseband signal, gain of the I component of the baseband signal, and gain of the Q component of the baseband signal based on the calibration signal such that the imbalance within the transmitter is reduced.

4 more elements

A self-calibrating direct conversion transmitter, the transmitter comprises:

processing module;
and
memory operably coupled to the processing module, wherein the memory includes operational instructions that cause the processing module to:
mix an I component of a baseband signal with an I component of a local oscillation to produce a mixed I signal
mix a Q component of the baseband signal with a Q component of the local oscillation to produce a mixed Q signal;
sum the mixed I signal with the mixed Q signal to produce a modulated radio frequency (RF) signal;
produce a calibration signal based on an interpretation of the local oscillation and the modulated RF signal;
and
calibrate at least one of:
DC level of the I component of the baseband signal, DC level of the Q component of the baseband signal, gain of the I component of the baseband signal, and gain of the Q component of the baseband signal based on the calibration signal such that the imbalance within the transmitter is reduced.

7 more elements

Dependencies are inferred from the claim text.

Self-calibrating direct conversion transmitter

Life of this patent

Self-calibrating direct conversion transmitter

Life of this patent

Abstract

Claims34