Patent number 8508292 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "The present invention relates to a phase matching band-pass filter and, in particular, to a phase matching band-pass filter composed of devices having impedance changes following an exponential function in relation to frequency.
"The transceiver for use in baseband communication is provided with a low-pass filter to filter out the interferer while passing the original signal. Most communications are done over radio frequency carriers to avoid interference from each other, and the Radio Frequency (RF) transceiver of an RF system should use an RF band-pass filter that pass signals from a specific frequency band on which it operates.
"In the current frequency allocation system in which the entire range of frequency spectrum is densely allocated for different usages, the load of the digital front end or converter (ADC) of the transceiver increases due to the other frequency band signals if the RF band-pass filter having High-Q value is not used. This means the load increase of the digital front end or ADC following the band-pass filter of the receiver. Also, most of conventional RF transceivers include the filters implemented Complementary Metal-Oxide Semiconductor (CMOS) process. In most cases, the RF band-pass filter having High-Q value is implemented with a Surface Acoustic Wave Filter (SAW Filter). However, the SAW filter which uses mechanical resonance is large in volume and impossible to integrate in the form of IC, resulting in increase of whole manufacturing cost of the RF transceiver."
In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "Problem to be Solved
"In order to solve the above problem, the present invention proposes a phase matching band-pass filter using the exponential function approximation that is capable of improving the Q value of the filter.
"Also, the present invention proposes a phase matching band-pass filter that is capable of having the Q value greater than the conventional filters by implementing a new device of which impedance feature is of an exponential function in relation to frequency while using the non-ideal inductor and capacitor having parasitic resistances.
"Furthermore, the present invention proposes a phase matching band-pass filter that is capable of being controlled accurately by removing the interference to the signal input to the receiver.
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