MULTI-MODE AND MULTI-BAND TRANSMITTERS FOR WIRELESS COMMUNICATION
First Claim
1. An apparatus comprising:
- a transmitter configured to perform quadrature modulation based on inphase (I) and quadrature (Q) data signals when quadrature modulation is selected, to perform polar modulation based on the I and Q data signals when polar modulation is selected, and to generate a modulated signal with amplitude and phase modulation, the transmitter comprising at least one circuit block used for both quadrature modulation and polar modulation.
1 Assignment
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Accused Products
Abstract
Transmitters supporting multiple modulation modes and/or multiple frequency bands are described. A transmitter may perform large signal polar modulation, small signal polar modulation, and/or quadrature modulation, which may support different modulation schemes and systems. Circuit blocks may be shared by the different modulation modes to reduce cost and power. For example, a single modulator and a single power amplifier may be used for small signal polar modulation and quadrature modulation. The transmitter may apply pre-distortion to improve performance, to allow a power amplifier to support multiple frequency bands, to allow the power amplifier to operate at higher output power levels, etc. Envelope and phase distortions due to non-linearity of the power amplifier may be characterized for different input levels and different bands and stored at the transmitter. Thereafter, envelope and phase signals may be pre-distorted based on the stored characterizations to compensate for non-linearity of the power amplifier.
61 Citations
25 Claims
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1. An apparatus comprising:
a transmitter configured to perform quadrature modulation based on inphase (I) and quadrature (Q) data signals when quadrature modulation is selected, to perform polar modulation based on the I and Q data signals when polar modulation is selected, and to generate a modulated signal with amplitude and phase modulation, the transmitter comprising at least one circuit block used for both quadrature modulation and polar modulation. - View Dependent Claims (2, 3, 4, 5)
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6. A method comprising:
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performing quadrature modulation based on inphase (I) and quadrature (Q) data signals when quadrature modulation is selected; performing polar modulation based on the I and Q data signals when polar modulation is selected; generating a modulated signal with amplitude and phase modulation for both quadrature modulation and polar modulation; and amplifying the modulated signal with a single power amplifier for both quadrature modulation and polar modulation.
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7. An apparatus comprising:
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an oscillator configured to provide inphase (I) and quadrature (Q) local oscillator (LO) signals; and a modulator configured to perform quadrature modulation on the I and Q LO signals with I and Q modulating signals when quadrature modulation is selected and to perform amplitude modulation on the I and Q LO signals with an envelope signal when polar modulation is selected. - View Dependent Claims (8, 9, 10, 11)
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12. An apparatus comprising:
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a power amplifier configured to provide amplification for multiple transmitter settings, each transmitter setting corresponding to a different frequency band or a different radio technology; and a pre-distortion unit configured to perform pre-distortion to compensate for non-linearity of the power amplifier for each of the multiple transmitter settings. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus comprising:
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a transmitter configured to generate a phase modulated signal when polar modulation is selected and to generate a quadrature modulated signal when quadrature modulation is selected, the transmitter comprising a linear power amplifier configured to provide amplification for the quadrature modulated signal when quadrature modulation is selected, and a non-linear power amplifier configured to provide amplification and amplitude modulation for the phase modulated signal when polar modulation is selected. - View Dependent Claims (23, 24, 25)
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Specification