Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships
DC CAFCFirst Claim
1. A system for frequency down-converting a modulated carrier signal, comprising:
- a first switch, a first control signal which comprises a sampling aperture with a specified frequency, and a first energy storage element that down-converts said modulated carrier signal according to said first control signal and outputs a down-converted in-phase signal portion of said modulated carrier signal;
a second switch, a second control signal which comprises a sampling aperture with a specified frequency, and a second energy storage element that down-converts said modulated carrier signal according to said second control signal and outputs a down-converted inverted in-phase signal portion of said modulated carrier signal;
the first and second control signals each controlling a charging and discharging cycle of their respective energy storage element by controlling the first and second switching devices so that for each switching device a portion of energy is transferred from the modulated carrier signal to the respective energy storage element during a charging part of the cycle and a portion of the transferred energy is discharged during a discharging part of the cycle for each respective switching device, and each said control signal operating at an aliasing rate selected so that energy of the modulated carrier signal is sampled and differentially applied to the respective energy storage element at the frequency of the respective control signal'"'"'s aperture, and each respective energy storage element generating, respectively, said differential down-converted in-phase signal portion and said down-converted inverted in-phase signal portion of said modulated carrier signal from the alternate charging and discharging applied to the respective energy storage element differentially applied by each respective switching device using said respective first or second control 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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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 hasehand 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.
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Citations
28 Claims
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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 control signal which comprises a sampling aperture with a specified frequency, and a first energy storage element that down-converts said modulated carrier signal according to said first control signal and outputs a down-converted in-phase signal portion of said modulated carrier signal; a second switch, a second control signal which comprises a sampling aperture with a specified frequency, and a second energy storage element that down-converts said modulated carrier signal according to said second control signal and outputs a down-converted inverted in-phase signal portion of said modulated carrier signal; the first and second control signals each controlling a charging and discharging cycle of their respective energy storage element by controlling the first and second switching devices so that for each switching device a portion of energy is transferred from the modulated carrier signal to the respective energy storage element during a charging part of the cycle and a portion of the transferred energy is discharged during a discharging part of the cycle for each respective switching device, and each said control signal operating at an aliasing rate selected so that energy of the modulated carrier signal is sampled and differentially applied to the respective energy storage element at the frequency of the respective control signal'"'"'s aperture, and each respective energy storage element generating, respectively, said differential down-converted in-phase signal portion and said down-converted inverted in-phase signal portion of said modulated carrier signal from the alternate charging and discharging applied to the respective energy storage element differentially applied by each respective switching device using said respective first or second control 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for frequency down-converting a modulated carrier signal, comprising:
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a first switch, a first control signal which comprises a sampling aperture with a specified frequency, and a first energy storage element that down-converts said modulated carrier signal according to said first control signal and outputs a down-converted in-phase signal portion of said modulated carrier signal; a second switch, a second control signal which comprises a sampling aperture with a specified frequency, and a second energy storage element that down-converts said modulated carrier signal according to said second control signal and outputs a down-converted inverted in-phase signal portion of said modulated carrier signal; 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; a third switch, a third control signal which comprises a sampling aperture with a specified frequency, and a third energy storage element that down-converts said modulated carrier signal according to said third control signal and outputs a down-converted quadrature-phase signal portion of said modulated carrier signal; a fourth switch, a fourth aperture signal, and a fourth energy storage element that down-converts said modulated carrier signal according to said fourth control signal and outputs a down-converted inverted quadrature-phase signal portion of said modulated carrier signal; and a second differential amplifier circuit that combines said down-converted quadrature-phase signal portion with said inverted quadrature-phase signal portion and outputs a second channel down-converted differential quadrature-phase signal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification