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US 2012/0069931 A1Published application
Multi-band power amplifier digital predistortion system and method
AssigneeTexas Instruments Incorporated
InventorsHardik P. Gandhi, Lei Ding, Zigang Yang
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Abstract
Traditionally, for multi-band communication systems, independent signal chains for each of the different bands are employed. By using such an architecture, there are a large number of components, and there is substantial power consumption. Here, transmit processor is provided that enables transmission across multiple bands using few components (namely, fewer signal chains), while also provided for digital predistortion.
Claims21
An apparatus comprising:
- a plurality of digital predistortion (DPD) pipelines that each receive at least one of a plurality of input signals, wherein each input signal is associated with at least one of a plurality of bands, and wherein each DPD pipeline includes:
- a baseband processing circuit that receives its input signal and generates a processed signal;
- a plurality of cross-modulation DPD circuits, wherein each cross DPD circuit receives the processed signal from at least one of the remaining DPD pipelines so as to calculate cross-modulation corrections between its band and a remaining band;
- an inter-modulation DPD circuit that receives the processed signal from its baseband processing circuit so as to calculate an inter-modulation correction for its band;
- a mix-and-sum circuit that receives outputs from each of the DPD pipelines;
- and an adaptive DPD engine that provides adaptive DPD data to each of the DPD pipelines.
3 more elements
An apparatus comprising:
- a transmit processor that receives a first input signal and a second input signal, wherein the first input signal is associated with a first band, and wherein the second input signal is associated with a second band, and wherein the transmit processor includes:
- a first DPD pipeline having:
- a first baseband processing circuit that receives the first input signal and generates a first processed signal;
- a first cross-modulation DPD circuit;
- and
- a first inter-modulation DPD circuit that receives the first processed signal;
- a second DPD pipeline having:
- a second baseband processing circuit that receives the second input signal and generates a second processed signal, wherein the second processed signal is provided to the first cross-modulation DPD circuit;
- a second cross-modulation DPD circuit that receives the first processed signal;
- and
- a second inter-modulation DPD circuit that receives the second processed signal;
- a mix-and-sum circuit that receives outputs from each of the DPD pipelines;
- and
- an adaptive DPD engine that provides adaptive DPD data to each of the DPD pipelines;
- a transmit circuit that is coupled to transmit processor so as to receive an output of the mix-and-sum circuit;
- an amplifier that is coupled to the transmit circuit;
- a feedback circuit that is coupled to the amplifier and the transmit processor;
- and
- an oscillator circuit that is coupled to the transmit circuit and the feedback circuit.
16 more elements
An apparatus comprising:
- a transmit processor that receives a first input signal and a second input signal, wherein the first input signal is associated with a first band, and wherein the second input signal is associated with a second band, and wherein the transmit processor includes:
- a first DPD pipeline having:
- a first baseband processing circuit that receives the first input signal and generates a first processed signal;
- a first cross-modulation DPD circuit;
- and
- a first inter-modulation DPD circuit that receives the first processed signal;
- a second DPD pipeline having:
- a second baseband processing circuit that receives the second input signal and generates a second processed signal, wherein the second processed signal is provided to the first cross-modulation DPD circuit;
- a second cross-modulation DPD circuit that receives the first processed signal;
- and
- a second inter-modulation DPD circuit that receives the second processed signal;
- a mix-and-sum circuit that receives outputs from each of the DPD pipelines;
- and
- an adaptive DPD engine that provides adaptive DPD data to each of the DPD pipelines;
- a transmit circuit that is coupled to transmit processor so as to receive an output of the mix-and-sum circuit, wherein the transmit circuit includes:
- an first digital-to-analog converter (DAC) that receives an in-phase portion of the output of the mix-and-sum circuit;
- a second DAC that receives a quadrature portion of the output of the mix-and-sum circuit;
- a modulator that is coupled to the first and second DACs;
- and
- a low power amplifier that is coupled to the modulator;
- a high power amplifier that is coupled to lower power amplifier;
- a feedback circuit having:
- a feedback mixer that is coupled to the high power amplifier;
- an analog-to-digital converter (ADC) that is coupled to the feedback mixer and the transmit processor;
- and
- an oscillator circuit having:
- a local oscillator circuit that generates a first local oscillator signal that is associated with the first band and a second local oscillator signal that is associated with the second band, wherein the local oscillator circuit is coupled to the modulator so as to provide at least one of the first and second local oscillator signals to the modulator;
- and
- a multiplexer that is coupled to the local oscillator circuit and the feedback mixer so as to at least one of the first and second local oscillator signals to the feedback mixer based on a selection of the first and second bands
26 more elements
Dependencies are inferred from the claim text.