Digitally controlled analog RF filtering in subsampling communication receiver architecture
First Claim
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1. A method of downconverting a first periodic voltage waveform into a second periodic voltage waveform, comprising:
- obtaining from the first voltage waveform a plurality of temporally distinct samples respectively indicative of areas under corresponding half-cycles of the first voltage waveform and transforming the first voltage waveform into a corresponding current waveform, and integrating each half-cycle of the current waveform wherein said integrating step includes using each half-cycle of the current waveform to charge a corresponding capacitor;
combining the samples to produce the second voltage waveform; and
manipulating the samples to implement a filtering operation such that the second voltage waveform represents a downconverted, filtered version of the first voltage waveform.
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Abstract
A first periodic voltage waveform (20) is downconverted into a second periodic voltage waveform (35, 36). A plurality of temporally distinct samples (SA1, SA2, . . . ) respectively indicative of areas under corresponding half-cycles of the first voltage waveform are obtained. The samples are combined to produce the second voltage waveform, and are also manipulated to implement a filtering operation such that the second voltage waveform represents a downconverted, filtered version of the first voltage waveform.
23 Citations
38 Claims
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1. A method of downconverting a first periodic voltage waveform into a second periodic voltage waveform, comprising:
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obtaining from the first voltage waveform a plurality of temporally distinct samples respectively indicative of areas under corresponding half-cycles of the first voltage waveform and transforming the first voltage waveform into a corresponding current waveform, and integrating each half-cycle of the current waveform wherein said integrating step includes using each half-cycle of the current waveform to charge a corresponding capacitor; combining the samples to produce the second voltage waveform; and manipulating the samples to implement a filtering operation such that the second voltage waveform represents a downconverted, filtered version of the first voltage waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 37)
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17. An apparatus for downconverting a first periodic voltage waveform into a second periodic voltage waveform, comprising:
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an input for receiving the first voltage waveform; a sampler coupled to said input for obtaining from the first voltage waveform a plurality of temporally distinct samples respectively indicative of areas under corresponding half-cycles of the first voltage waveform, said sampler including a transconductance amplifier for transforming the first voltage waveform into a corresponding current waveform, and a plurality of capacitors coupled to said transconductance amplifier for integrating each half-cycle of the current waveform; a combiner coupled to said sampler for combining the samples to produce the second voltage waveform; and at least one of said sampler and said combiner operable for manipulating the samples to implement a filtering operation such that the second voltage waveform represents a downconverted, filtered version of the first voltage waveform. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 38)
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32. A communication receiving apparatus, comprising:
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an input for receiving a communication signal formed as a first periodic voltage waveform; a mixer coupled to said input for downconverting the first periodic voltage waveform into a second periodic voltage waveform, including a sampler coupled to said input for obtaining from the first voltage waveform a plurality of temporally distinct samples respectively indicative of areas under corresponding half-cycles of the first voltage waveform, a combiner coupled to said sampler for combining the samples to produce the second voltage waveform, and at least one of said sampler and said combiner operable for manipulating the samples to implement a filtering operation such that the second voltage waveform represents a downconverted, filtered version of the first voltage waveform; and a signal processing portion coupled to said mixer for receiving and processing the second voltage waveform. - View Dependent Claims (33, 34, 35, 36)
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Specification