Method and System for Down-Converting an Electromagnetic Signal, and Transforms for Same, and Aperture Relationships
First Claim
1. A system for frequency down-converting a modulated carrier signal, comprising:
- a first switch, a first aperture signal, and a first energy storage element that down-converts said modulated carrier signal according to a first control signal and outputs a down-converted in-phase signal portion of said modulated carrier signal;
a second switch, a second aperture signal, and a second energy storage element that down-converts said modulated carrier signal according to a second control signal and outputs a down-converted inverted in-phase signal portion of said modulated carrier signal; and
a first differential amplifier circuit that combines said down-converted in-phase signal portion with said inverted in-phase signal portion and outputs a first channel down-converted differential in-phase signal.
1 Assignment
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Accused Products
Abstract
Methods, systems, and apparatuses, and combinations and sub-combinations thereof, for down-converting an electromagnetic (EM) signal are described herein. Briefly stated, in embodiments the invention operates by receiving an EM signal and recursively operating on approximate half cycles (½, 1½, 2½, etc) of the carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal.
5 Citations
1 Claim
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1. A system for frequency down-converting a modulated carrier signal, comprising:
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a first switch, a first aperture signal, and a first energy storage element that down-converts said modulated carrier signal according to a first control signal and outputs a down-converted in-phase signal portion of said modulated carrier signal; a second switch, a second aperture signal, and a second energy storage element that down-converts said modulated carrier signal according to a second control signal and outputs a down-converted inverted in-phase signal portion of said modulated carrier signal; and a first differential amplifier circuit that combines said down-converted in-phase signal portion with said inverted in-phase signal portion and outputs a first channel down-converted differential in-phase signal.
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Specification
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- Resources
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Current AssigneeParkerVision, Inc.
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Original AssigneeParkerVision, Inc.
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InventorsSorrells, David F., Bultman, Michael J., Cook, Robert W., Looke, Richard C., Moses, Charley D., Rawlins, Gregory S., Rawlins, Michael W.
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current375/302
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CPC Class CodesH03C 1/62 Modulators in which amplitu...H03D 7/00 Transference of modulation ...H03D 7/1441 using field-effect transist...H03D 7/1475 Subharmonic mixer arrangementsH04B 1/0025 using a sampling rate lower...H04B 1/16 CircuitsH04B 1/28 the receiver comprising at ...H04B 7/12 Frequency diversityH04L 25/08 Modifications for reducing ...H04L 27/00 Modulated-carrier systemsH04L 27/06 Demodulator circuits; Recei...H04L 27/12 Modulator circuits; Transmi...H04L 27/14 Demodulator circuits; Recei...H04L 27/148 using filters, including PL...H04L 27/156 with demodulation using tem...H04L 27/2672 Frequency domainH04L 27/3881 using sampling and digital ...
