Amplitude modulator
First Claim
1. A method for amplitude modulating a carrier signal, comprising:
- splitting the carrier signal into first and second paths;
phase modulating the carrier signal on the first path;
phase modulating the carrier signal on the second path;
combining the phase modulated carrier signal on the first path with the phase modulated carrier signal on the second path for generating an amplitude modulated output signal; and
wherein a first feedback loop couples the amplitude modulated output signal to circuitry for phase modulating the carrier signal on the second path but not to circuitry for phase modulating the carrier signal on the first path, the first feedback loop being for reducing a residual phase variation of the amplitude modulated output signal.
1 Assignment
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Accused Products
Abstract
A method for amplitude modulating a carrier signal according to one embodiment includes splitting the carrier signal into first and second paths; phase modulating the carrier signal on the first path; phase modulating the carrier signal on the second path; combining the phase modulated carrier signal on the first path with the phase modulated carrier signal on the second path for generating an amplitude modulated output signal; and wherein a first feedback loop couples the amplitude modulated output signal to circuitry for phase modulating the carrier signal on the second path but not to circuitry for phase modulating the carrier signal on the first path, the first feedback loop being for reducing a residual phase variation of the amplitude modulated output signal. Additional systems and methods are also presented.
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Citations
22 Claims
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1. A method for amplitude modulating a carrier signal, comprising:
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splitting the carrier signal into first and second paths; phase modulating the carrier signal on the first path; phase modulating the carrier signal on the second path; combining the phase modulated carrier signal on the first path with the phase modulated carrier signal on the second path for generating an amplitude modulated output signal; and wherein a first feedback loop couples the amplitude modulated output signal to circuitry for phase modulating the carrier signal on the second path but not to circuitry for phase modulating the carrier signal on the first path, the first feedback loop being for reducing a residual phase variation of the amplitude modulated output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A circuit for amplitude modulating a carrier signal, comprising:
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circuitry for splitting a carrier signal into first and second paths; circuitry for phase modulating the carrier signal on the first path; circuitry for receiving a baseband signal that is not derived from the carrier signal, wherein the baseband signal affects circuitry for phase modulating the carrier signal on the first path; circuitry for phase modulating the carrier signal on the second path; and circuitry for combining the phase modulated carrier signal on the first path with the phase modulated carrier signal on the second path for generating an amplitude modulated signal. - View Dependent Claims (11, 12)
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13. A method for amplitude modulating a carrier signal, comprising:
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splitting a carrier signal into first and second paths; constant-envelope phase modulating the carrier signal on the first path; constant-envelope phase modulating the carrier signal on the second path; amplifying the phase modulated carrier signal on the first path; amplifying the phase modulated carrier signal on the second path; the amplified phase modulated carrier signal on the first path with the amplified phase modulated carrier signal on the second path for generating an amplitude modulated output signal; and wherein a first feedback loop couples the amplitude modulated output signal to circuitry for phase modulating the carrier signal on the second path, the first feedback loop controlling a phase shifter in the circuitry for phase modulating the carrier signal on the second path.
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14. A method for amplitude modulating a carrier signal, comprising:
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splitting a carrier signal into first and second paths; phase modulating the carrier signal on the first path; phase modulating the carrier signal on the second path; combining the phase modulated carrier signal on the first path with the phase modulated carrier signal on the second path for generating an amplitude modulated output signal; wherein a first feedback loop couples the amplitude modulated output signal to circuitry for phase modulating the carrier signal on the second path, the first feedback loop being for reducing a residual phase variation of the amplitude modulated output signal. - View Dependent Claims (15)
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16. A method for amplitude modulating a carrier signal, comprising:
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splitting a carrier signal into first and second paths; phase modulating the carrier signal on the first path; phase modulating the carrier signal on the second path; combining the phase modulated carrier signal on the first path with the phase modulated carrier signal on the second path for generating an amplitude modulated output signal; wherein a first feedback loop couples the amplitude modulated output signal to circuitry for phase modulating the carrier signal on the second path, the first feedback loop being, for reducing a residual phase variation of the amplitude modulated output signal; wherein a second feedback loop is coupled to an output of the amplitude modulated output signal; and using a baseband signal and a signal from the second feedback loop to make an envelope amplitude of the amplitude modulated output signal linearly proportional to an amplitude of the baseband - View Dependent Claims (17)
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18. A circuit for modulating a carrier signal, comprising:
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circuitry for creating from a carrier signal two sub-signals; circuitry for phase modulating at least one of the sub-signals relative to the other; and circuitry for combining the sub-signals to produce a modulated carrier signal, wherein at least one of the sub-signals is phase modulated under control of a feedback loop having as inputs the carrier signal and the modulated carrier signal. - View Dependent Claims (19, 20)
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21. A method for modulating a carrier signal, comprising:
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creating two electronic sub-signals from a carrier signal; phase modulating at least one of the sub-signals relative to the other; and combining the sub-signals to produce a modulated carrier signal, wherein at least one of the sub-signals is phase modulated under control of a feedback loop having as an input the modulated carrier signal. - View Dependent Claims (22)
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Specification