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Receiver circuits and systems for receiving medium wave and short wave signals

A technology of receiving paths and multiplexing signals, applied in directional diversity systems using radio waves, direction finders and circuits using radio waves, etc. It can solve problems such as difficulty in constructing tuning front-end circuits and large impedance of whip antennas.

Active Publication Date: 2012-07-18
SKYWORKS SOLUTIONS INC
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  • Abstract
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AI Technical Summary

Problems solved by technology

In addition, the whip antenna introduces a large impedance, making it difficult to construct a tuned front-end circuit without losing signal and capacitive division

Method used

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  • Receiver circuits and systems for receiving medium wave and short wave signals
  • Receiver circuits and systems for receiving medium wave and short wave signals
  • Receiver circuits and systems for receiving medium wave and short wave signals

Examples

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Embodiment Construction

[0021] Broadcast radio coverage in rural areas is sometimes limited, in part because frequency modulated (FM) radio signals, which are preferred for portable communications, attenuate significantly over long distances. Medium wave (usually an amplitude modulated (AM) signal) can travel farther, making AM broadcast receivers a desirable option for portable radios, media devices, and cellular phones sold in rural areas where long-distance AM coverage is superior to FM coverage feature. AM frequencies are about 1 / 100th of FM frequencies, making their wavelengths significantly longer and making compact antennas within such portable receivers less efficient at receiving AM signals. Additionally, practical compact antennas, such as ferrite loop rod antennas, are inherently directional, so mobile devices using AM signals tend to be easily switched on and off. In addition, cellular phones—especially the electronics associated with their displays—generate a lot of interference in the ...

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Abstract

A receiver includes a first terminal for receiving an RF signal having a frequency of less than approximately 60 MHz, a second terminal, and a receive path having an input coupled to the first terminal and an output for providing a demodulated RF signal. The receiver further includes a detector coupled to the receive path for detecting a signal parameter in the RF signal and a controller coupled to the detector and to the second terminal. The controller provides the multiplex signal in a tuning state to the second terminal to selectively provide one of a first RF signal and a second RF signal to the first terminal and to determine at least one of a first parameter of the first RF signal and a second parameter of the second RF signal. The controller provides the multiplex signal in an operating state based on the first parameter and the second parameter.

Description

technical field [0001] The present disclosure relates generally to receiver circuits, and more particularly to receiver circuits and systems for receiving medium wave and short wave radio signals. Background technique [0002] The radio frequency circuitry may be configured to receive frequency modulated (FM) signals, amplitude modulated (AM) signals, and / or numerous digital modulation schemes. Conventional portable receiver equipment typically includes compact antennas that are generally proportional to the signal wavelength in the high frequency bands, but a small fraction of the signal wavelength in the medium wave and short wave bands. [0003] Whip antennas are often used to receive radio signals for AM / FM radios. For example, vehicles use short electric whip antennas to receive medium wave radio signals; however, such antennas work best in the context of larger locations, such as vehicle bodies. In addition, the whip antenna introduces a large impedance, making it di...

Claims

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Application Information

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IPC IPC(8): H04B1/16H04B1/18
CPCH01Q3/24H04B1/18H01Q1/243H01Q7/08H01Q7/00H04B1/1027G01S3/72H04B1/1638
Inventor S·威林汉姆V·萨达
Owner SKYWORKS SOLUTIONS INC
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