| Hybrid receiver architecture using upconversion followed by direct downconversion -> Monitor Keywords |
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Hybrid receiver architecture using upconversion followed by direct downconversionRelated Patent Categories: Pulse Or Digital Communications, ReceiversHybrid receiver architecture using upconversion followed by direct downconversion description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060078069, Hybrid receiver architecture using upconversion followed by direct downconversion. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCES TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application No. 60/618,241, filed Oct. 12, 2004, entitled A HYBRID RECEIVER ARCHITECTURE USING UPCONVERSION FOLLOWED BY DIRECT DOWNCONVERSION; which is hereby incorporated herein by reference in its entirety. BACKGROUND OF THE INVENTION [0002] The disclosure relates to electronic signal processing. More particularly, the disclosure relates to an RF receiver and receiver architecture. [0003] In a typical frequency division multiplex communication system, multiple transmissions can simultaneously occupy a predefined operating band. The signals within the operating band can operate according to a predetermined communication standard, and thus, can have an energy within a predictable dynamic range. The communication standard can also specify a frequency spacing between adjacent channels, and the channel bandwidth. The communication standard can also specify signal parameters, such as modulation type, information rates, out of channel performance, as well as other signal parameters. [0004] Additionally, there can be numerous signal sources operating outside of the operating band. Unlike the signals within the operating band, the out of band signals are typically not regulated by the communication standard regulating the in band signal performance. As a result, out of band signals may have substantially greater energy relative to the in-band signals, and can operate according to different signal parameters, including modulation type, out of band performance, and other parameters. [0005] In order to tune to a desired channel, a receiver needs to substantially eliminate the effects of undesired channels, including those known interferers occurring within known operating bands as well as unanticipated interferers. [0006] Many receiver implementations have been developed to support the various communication standards. The trend of increasing device complexity and performance while simultaneously reducing the physical size of electronic devices imposes tremendous constraints on ongoing development. [0007] For example, the size of cellular and cordless telephones continues to shrink while simultaneously improving the quality of the device and adding additional functionality to the device. Similarly, radios and televisions are constantly being redesigned to provide improved features and operating modes while simultaneously decreasing physical size. Although the screen size available in television receivers continues to grow, the advancement of technologies that enable flat screens and short depths greatly reduce the volume available for electronics. [0008] It is desirable to increase the ability of a receiver to operate in multiple modes or frequency bands without compromising received signal quality. Additionally, it is desirable for a receiver implementation to minimize size, cost, and power consumption over implementations presently available. BRIEF SUMMARY OF THE INVENTION [0009] A receiver configured to selectively receive an RF signal from an operating band having a plurality of RF channels. The receiver is configured to upconvert the desired RF channel to an intermediate frequency (IF) greater than the RF channel frequencies. The upconverted RF channel is downconverted to baseband or a low IF. The receiver can perform channel selection by filtering the baseband or low IF signal. The baseband or low IF signal can be upconverted to a programmable output IF. [0010] The disclosure includes a receiver that includes an upconverter configured to frequency convert an input signal to an intermediate frequency signal in a frequency band greater than at least a portion of an input signal frequency band, a downconverter coupled to the upconverter and configured to frequency convert the intermediate frequency signal to a baseband signal, and a filter coupled to the downconverter and configured to filter the baseband signal. [0011] The disclosure includes a receiver that includes a first upconverter configured to upconvert a desired RF signal to a first Intermediate Frequency (IF) that is greater than a frequency of the desired RF signal, a filter coupled to the upconverter and configured to perform band selection filtering of a signal output by the upconverter to generate a filtered upconverted signal, a quadrature direct downconverter configured to downconvert a desired signal in the filtered upconverted signal to in-phase and quadrature signal components, a first filter coupled to the quadrature direct downconverter and configured to perform channel selection filtering on the in-phase signal component, a second filter coupled to the quadrature direct downconverter and configured to perform channel selection filtering on the quadrature signal component, a second upconverter coupled to the first and second filters and configured to upconvert the filtered in-phase and quadrature signal components to in-phase and quadrature output IF signal components, and a signal combiner coupled to the second upconverter and configured to combine the in-phase and quadrature output IF signal components. [0012] The disclosure includes a method of processing a received signal. The method includes upconverting a desired input signal to a first intermediate frequency (IF) signal at a frequency greater than a frequency of the desired input signal, downconverting the first IF signal to a baseband signal, and performing channel selection on the baseband signal. [0013] The disclosure includes a method of processing a received signal. The method includes selecting a desired television signal at a desired RF channel, upconverting the desired television signal to a first Intermediate Frequency (IF) that is greater than a frequency of the desired RF channel; [0014] direct downconverting the desired television signal from the first IF to in-phase and quadrature signal components, performing channel selection filtering on each of the in-phase and quadrature signal components, upconverting the in-phase and quadrature signal components to second IF in-phase and quadrature signal components at a desired second IF, and combining the second IF in-phase and quadrature signal components to generate the desired television signal at the second IF. BRIEF DESCRIPTION OF THE DRAWINGS [0015] The features, objects, and advantages of embodiments of the disclosure will become more apparent from the detailed description set forth below when taken in conjunction with the drawings, in which like elements bear like reference numerals. [0016] FIG. 1 is a simplified functional block diagram of an embodiment of a receiver in a system. [0017] FIG. 2 is a simplified functional block diagram of an embodiment of a receiver having initial signal upconversion. [0018] FIG. 3 is a simplified functional block diagram of an embodiment of a receiver having initial signal upconversion. [0019] FIG. 4 is a simplified flowchart of an embodiment of a method of processing received signals. DETAILED DESCRIPTION OF THE INVENTION Continue reading about Hybrid receiver architecture using upconversion followed by direct downconversion... 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