Time alignment of polar transmitter
First Claim
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1. A polar transmitter system, comprising:
- a direct synthesis modulator operative to generate an output signal based upon a reference signal, the direct synthesis modulator being responsive to an amplitude modulation control signal and a frequency modulation control signal; and
a signal alignment module configured to apply the amplitude modulation control signal and the frequency modulation control signal to the direct synthesis modulator in accordance with a defined timing relationship;
wherein the amplitude modulation control signal and the frequency modulation control signal are based upon an input amplitude modulation signal and an input phase or frequency modulation signal, respectively; and
wherein the signal alignment module includes a first latch arrangement which latches the input amplitude modulation signal and a second latch arrangement which latches the input phase or frequency modulation signal.
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Abstract
An alignment apparatus for use with a polar transmitter system is disclosed herein. The alignment apparatus includes a signal alignment module configured to apply an amplitude modulation control signal and a frequency modulation control signal to the polar transmitter in accordance with a defined timing relationship. A time alignment network, operatively coupled between an output of the polar transmitter system and the signal alignment module, sets the defined timing relationship.
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Citations
22 Claims
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1. A polar transmitter system, comprising:
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a direct synthesis modulator operative to generate an output signal based upon a reference signal, the direct synthesis modulator being responsive to an amplitude modulation control signal and a frequency modulation control signal; and a signal alignment module configured to apply the amplitude modulation control signal and the frequency modulation control signal to the direct synthesis modulator in accordance with a defined timing relationship; wherein the amplitude modulation control signal and the frequency modulation control signal are based upon an input amplitude modulation signal and an input phase or frequency modulation signal, respectively; and wherein the signal alignment module includes a first latch arrangement which latches the input amplitude modulation signal and a second latch arrangement which latches the input phase or frequency modulation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A signal alignment module for use with a polar transmitter, the alignment module comprising:
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a first latch arrangement which latches an input amplitude modulation signal; a second latch arrangement which latches an input phase or frequency modulation signal; and a triggering network for providing a first timing signal to the first latch arrangement and a second timing signal to the second latch arrangement wherein the triggering network establishes a defined time offset between the first timing signal and the second timing signal. - View Dependent Claims (9)
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10. An alignment apparatus for use with a polar transmitter system, the apparatus comprising:
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a signal alignment module configured to apply an amplitude modulation control signal and a frequency modulation control signal to the polar transmitter in accordance with a defined timing relationship; and a time alignment network, operatively coupled between an output of the polar transmitter system and the signal alignment module, for setting the defined timing relationship; wherein the time alignment network includes; a signal source for applying test signals to inputs of the signal alignment module, and a control network for determining the defined timing relationship based upon output signals generated by the polar transmitter based upon the test signals. - View Dependent Claims (11, 12)
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13. An apparatus for adjusting signal time alignment within a polar transmitter system, the apparatus comprising:
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a signal alignment module operative to apply control signals to the polar transmitter system; and a time alignment network for setting a timing relationship imposed upon the control signals by the signal alignment module, the time alignment network including; a signal source unit coupled to the signal alignment module, a receiver coupled to an output of the polar transmitter system, and a control network coupled between an output of the receiver and the signal alignment module. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification