Polar modulation with coarse and fine FM signals
AssigneeQuintic Holdings
InventorJohn B. Groe
Life of this patent
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Abstract
Apparatus and methods for enhancement of performance in polar modulators are described. In one implementation, an FM signal component is divided into a coarse FM signal and a residue FM signal to be applied to a VCO for generation of a modulation signal. The coarse FM signal may be proportional to a threshold value when the FM signal exceeds the threshold, while the residue FM signal may be proportional to the difference between the FM signal and coarse FM signal.
Claims28
A method for processing an FM signal of a polar modulation signal, comprising:
- comparing the FM signal to a threshold value;
- responsive to said comparing, generating a digital data stream representing a coarse FM signal, wherein the coarse FM signal is:
- proportional to a value represented by the digital data stream when the FM signal is greater than the threshold value;
- and
- zero-valued when the FM signal is less than the threshold value;
- and generating a residue FM signal corresponding to the difference between the FM signal and the coarse FM signal.
A method for processing an FM signal of a polar modulation signal, comprising:
- comparing the FM signal to one or more threshold values;
- responsive to said comparing, generating one or more digital data streams representing one or more coarse FM signals, wherein said one or more coarse FM signals are:
- proportional to one or more values represented by said one or more digital data streams when the FM signal is greater than said one or more threshold values respectively;
- and
- zero-valued when the FM signal is less than said one or more threshold values respectively;
- and
- generating a residue FM signal corresponding to the difference between the FM signal and said one or more coarse FM signals.
An Apparatus for processing an FM signal of a modulation signal in a polar modulator, comprising:
- a detection circuit configured to determine when the FM signal exceeds a threshold value;
- a coarse FM signal generation circuit configured to generate, responsive to said determining, a digital bit stream representing the coarse FM signal when the FM signal exceeds the threshold value;
- and
- a residue FM signal generation circuit configured to generate a residue FM signal corresponding to the difference between the FM signal and the coarse FM signal.
An Apparatus for processing an FM signal component of a modulation signal in a polar modulator, comprising:
- a detection circuit configured to determine when the FM signal exceeds a threshold value;
- a coarse signal generation circuit configured to generate, responsive to said determining, one or more digital bit streams representing one or more coarse FM signals representative of one or more a plurality of threshold values when the FM signal exceeds one or more threshold values;
- and
- a residue signal generation circuit configured to generate a residue FM signal corresponding to the difference between the FM signal and said one or more coarse FM signals.
Dependencies are inferred from the claim text.