Method and apparatus for reducing dynamic range of a power amplifier
First Claim
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1. A method of operating a polar transmitter, the method comprising:
- transmitting first information at a first output power greater than an output-power threshold, wherein the first information is amplitude and phase modulated;
transmitting second information at a second output power not exceeding the output-power threshold, wherein the second information is only phase modulated; and
wherein the output-power threshold is selected such that at least one signal requirement is not outside a pre-determined range when the output power does not exceed the output power threshold.
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Abstract
An output-power threshold is selected such that one or more signal requirements is not outside a pre-determined range when output power of a polar transmitter is less than the output-power threshold. A determination is made whether the output power is less than the threshold. In response to a determination that the output power is less than the threshold, amplitude modulation of a polar signal transmitted by the polar transmitter is disabled. When the output power meets or exceeds the output-power threshold, the polar signal transmitted by the polar transmitter is both amplitude and phase modulated.
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Citations
26 Claims
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1. A method of operating a polar transmitter, the method comprising:
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transmitting first information at a first output power greater than an output-power threshold, wherein the first information is amplitude and phase modulated;
transmitting second information at a second output power not exceeding the output-power threshold, wherein the second information is only phase modulated; and
wherein the output-power threshold is selected such that at least one signal requirement is not outside a pre-determined range when the output power does not exceed the output power threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of transmitting a polar signal, the method comprising:
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selecting an output-power threshold, the output-power threshold being selected such that at least one signal requirement is not outside a pre-determined range when output power is less than the output-power threshold;
determining whether the output power is less than the threshold; and
in response to a determination that the output power is less than the threshold, disabling amplitude modulation of the polar signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus comprising:
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a modulator, wherein the modulator is adapted to perform phase modulation of an input signal, thereby yielding a phase-modulated input signal;
a power amplifier adapted to perform amplitude modulation of the phase-modulated input signal in response to output power of the apparatus exceeding a pre-determined output-power threshold; and
wherein the output-power threshold is selected such that at least one signal requirement is not outside a pre-determined range when the output-power threshold is not exceeded. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification