Polar transmitter with feedthrough compensation
AssigneeHuawei Technologies Co., Ltd.
InventorsWael Al-Qaq, Xiaobao Yu, Zhihang Zhang, Min Yi
Life of this patent
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Abstract
A circuit includes a polar transmitter to generate a radio frequency output from amplitude and phase signal components. The polar transmitter includes an amplifier to combine amplitude and phase signal components. A processor is coupled to the polar transmitter to provide the amplitude and phase signal components. The processor includes: a digital modulation circuit to generate a modulated digital signal including in-phase and quadrature signal components and a correction circuit to calculate and apply a complex digital offset for local oscillator feedthrough of the amplifier. The complex digital offset includes an in-phase offset correction factor and a quadrature offset correction factor.
Claims17
A polar transmitter, comprising:
- a transmitter for transmitting a radio frequency signal;
- a processor that includes a digital modulation circuit, the digital modulation circuit configured to:
- generate a modulated digital signal including an in-phase signal component and a quadrature signal component;
- and
- a correction circuit, the correction circuit configured to:
- apply a complex digital offset including an in-phase offset correction factor and a quadrature offset correction factor for generating a corrected amplitude signal component and a corrected phase signal component from the in-phase signal component and the quadrature signal component,
- wherein the processor is configured to:
- provide the corrected amplitude signal component and the corrected phase signal component to the transmitter of the polar transmitter,
- wherein the transmitter includes an amplifier to combine the corrected amplitude signal component and the corrected phase signal component, and wherein the correction circuit generates the corrected amplitude signal component and the corrected phase signal component to compensate local oscillator feedthrough.
A method, comprising:
- generating, by a digital modulation circuit of a processor in a polar transmitter, a modulated digital signal including an in-phase signal component and a quadrature signal component;
- applying, by a correction circuit of the processor, an complex digital offset including an in-phase offset correction factor and a quadrature offset correction factor for generating a corrected amplitude signal component and a corrected phase signal component from the in-phase signal component and the quadrature signal component;
- and
- providing, by the processor, the corrected amplitude signal component and the corrected phase signal component to a transmitter of the polar transmitter,
- wherein the transmitter includes an amplifier to combine the corrected amplitude signal component and the corrected phase signal component, and wherein the correction circuit generates the corrected amplitude signal component and the corrected phase signal component to compensate local oscillator feedthrough.
A system, comprising:
- a polar transmitter formed on a substrate;
- and
- a processor formed on the substrate and providing a corrected amplitude signal component and a corrected phase signal component to the polar transmitter, the processor including:
- a digital modulation circuit configured to generate a modulated digital signal including an in-phase signal component and a quadrature signal component, and
- a correction circuit configured to apply an complex digital offset including an in-phase offset correction factor and a quadrature offset correction factor for generating the corrected amplitude signal component and the corrected phase signal component from the in-phase signal component and the quadrature signal component,
- wherein the polar transmitter includes an amplifier to combine the corrected amplitude signal component and the corrected phase signal component, and wherein the correction circuit generates the corrected amplitude signal component and the corrected phase signal component to compensate local oscillator feedthrough.
Dependencies are inferred from the claim text.