Amplitude modulator
First Claim
1. A circuit for amplitude modulating a carrier signal, comprising:
- a carrier signal input;
circuitry for splitting the carrier signal into first and second paths;
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 output signal.
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Accused Products
Abstract
A circuit for amplitude modulating a carrier signal includes a carrier signal input, circuitry for splitting the carrier signal into first and second paths, 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 output signal. Feedback loops virtually eliminate residual phase shift and make the amplitude modulated output signal linearly proportional to the baseband signal.
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Citations
25 Claims
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1. A circuit for amplitude modulating a carrier signal, comprising:
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a carrier signal input;
circuitry for splitting the carrier signal into first and second paths;
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 output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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; and
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.
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13. A circuit for amplitude modulating a carrier signal, comprising:
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a carrier signal input;
circuitry for splitting the carrier signal into first and second paths;
circuitry for constant-envelope phase modulating the carrier signal on the first path;
circuitry for constant-envelope phase modulating the carrier signal on the second path;
a nonlinear amplifier on the first path for amplifying the phase modulated carrier signal on the first path;
a nonlinear amplifier on the second path for amplifying the phase modulated carrier signal on the second path; and
circuitry for combining 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. - View Dependent Claims (14, 15)
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16. A circuit for amplitude modulating a carrier signal, comprising:
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a carrier signal input;
circuitry for splitting the carrier signal into first and second paths;
circuitry for phase modulating the carrier signal on the first path;
circuitry for phase modulating the carrier signal on the second path;
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 output signal;
a first feedback loop coupling the amplitude modulated output signal to the 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 (17, 18, 19)
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20. A circuit for amplitude modulating a carrier signal, comprising:
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a carrier signal input;
circuitry for splitting the carrier signal into first and second paths;
circuitry for phase modulating the carrier signal on the first path;
circuitry for phase modulating the carrier signal on the second path;
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 output signal;
a baseband signal input;
a second feedback loop coupled to an output of the amplitude modulated output signal; and
linearizing circuitry coupled to the baseband signal input and second feedback loop for making an envelope amplitude of the amplitude modulated output signal linearly proportional to an amplitude of the baseband signal. - View Dependent Claims (21, 22, 23)
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24. A method for modulating a carrier signal, comprising:
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creating from a carrier signal two sub-signals;
phase modulating at least one of the sub-signals relative to the other; and
combining the sub-signals to produce a modulated carrier signal.
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25. A system 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.
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Specification