Digital outphasing transmitter architecture
First Claim
Patent Images
1. A method comprising:
- two digital signal processor (DSP) generators that each generate two streams of constant envelope signals;
performing digital amplitude modulation and digital phase modulation with a pair of sigma-delta modulators coupled with the two DSP generators on a plurality of base-band sinusoid signals to generate corresponding digital modulated signals;
driving a plurality of non-linear power amplifiers with the digital modulated signals, wherein the power amplifiers are configured as power oscillators that are injection locked to the digital modulated signals after upconversion;
providing digital compensation for a total gain/phase unbalance of each signal path; and
combining output signals from the power amplifiers with a passive power combiner.
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Abstract
Architectures including digital outphasing transmitters. Digital signal generation circuitry generates at least two base-band sinusoid signals. Bandpass modulation circuitry is coupled to receive the base-band sinusoid signals and generates at least two modulated digital signals. Power amplifiers are coupled to receive the modulated digital signals to amplify the modulated digital signals. The amplified modulated signals are combined and transmitted.
34 Citations
14 Claims
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1. A method comprising:
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two digital signal processor (DSP) generators that each generate two streams of constant envelope signals; performing digital amplitude modulation and digital phase modulation with a pair of sigma-delta modulators coupled with the two DSP generators on a plurality of base-band sinusoid signals to generate corresponding digital modulated signals; driving a plurality of non-linear power amplifiers with the digital modulated signals, wherein the power amplifiers are configured as power oscillators that are injection locked to the digital modulated signals after upconversion; providing digital compensation for a total gain/phase unbalance of each signal path; and combining output signals from the power amplifiers with a passive power combiner. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising:
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digital signal generation circuitry to generate at least two base-band sinusoid signals derived from a pair of phasors having the same amplitude and centered at the same frequency with varying phases; bandpass modulation circuitry coupled to receive the base-band sinusoid signals and to generate at least two modulated digital signals; at least two power amplifiers coupled to receive the at least two modulated digital signals to amplify the modulated digital signals, wherein the power amplifiers are configured as power oscillators that are injection locked to the digital modulated signals after upconversion; and a passive power combiner coupled with the at least two power amplifiers to combine amplified digital signals for transmission. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification