Radio-frequency circuit, communication device, and radio-frequency circuit designing method
AssigneeMurata Manufacturing Co., Ltd.
InventorsYusuke Kusumoto, Hirotsugu Mori
Life of this patent
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Abstract
A radio-frequency circuit that conveys a radio-frequency signal that is of a predetermined frequency band and modulated using 256-Quadrature Amplitude Modulation (QAM). The magnitude slope, which is the ratio of (i) the change in a magnitude ratio between an input signal and an output signal to (ii) the change in the frequency of the input signal, is at least −0.1 dB/MHz and at most 0.1 dB/MHz in the predetermined frequency band.
Claims9
A radio-frequency circuit configured to convey a radio-frequency signal that is of a predetermined frequency band and is modulated using 256-Quadrature Amplitude Modulation (QAM), comprising:
- a first filter having a passband including a first frequency band;
- and
- a second filter having a passband including a second frequency band different from the first frequency band,
- wherein:
- the first frequency band is an uplink operating band of a first communication band to which frequency division duplex is applied,
- the second frequency band is a downlink operating band of the first communication band, and
- a ratio of (i) a gap between the first frequency band and the second frequency band to (ii) a center frequency of one of the first frequency band and the second frequency band is at most 2 percent,
- wherein:
- a magnitude slope is at least −0.1 dB/MHz and at most 0.1 dB/MHz in the predetermined frequency band, the magnitude slope being a ratio of (i) a change in a magnitude ratio between an input signal and an output signal to (ii) a change in a frequency of the input signal.
A radio-frequency circuit configured to convey a radio-frequency signal that is of a predetermined frequency band and is modulated using 256-Quadrature Amplitude Modulation (QAM), comprising:
- a first filter having a passband including a first frequency band;
- and
- a second filter having a passband including a second frequency band different from the first frequency band, wherein
- the first frequency band is an uplink operating band of a first communication band to which frequency division duplex is applied,
- the second frequency band is a downlink operating band of the first communication band, and
- a ratio of (i) a gap between the first frequency band and the second frequency band to (ii) a bandwidth of one of the first frequency band and the second frequency band is at most 40 percent,
- wherein:
- a magnitude slope is at least −0.1 dB/MHz and at most 0.1 dB/MHz in the predetermined frequency band, the magnitude slope being a ratio of (i) a change in a magnitude ratio between an input signal and an output signal to (ii) a change in a frequency of the input signal.
A radio-frequency circuit configured to convey a radio-frequency signal that is of a predetermined frequency band and is modulated using 256-Quadrature Amplitude Modulation (QAM), comprising:
- a first filter having a passband including a first frequency band;
- and
- a second filter having a passband including a second frequency band different from the first frequency band, wherein
- the first frequency band is a second communication band to which time division duplex is applied,
- the second frequency band is one of an uplink operating band and a downlink operating band of a first communication band to which frequency division duplex is applied, and
- a ratio of (i) a gap between the first frequency band and the second frequency band to (ii) a center frequency of one of the first frequency band and the second frequency band is at most 2 percent,
- wherein:
- a magnitude slope is at least −0.1 dB/MHz and at most 0.1 dB/MHz in the predetermined frequency band, the magnitude slope being a ratio of (i) a change in a magnitude ratio between an input signal and an output signal to (ii) a change in a frequency of the input signal.
Dependencies are inferred from the claim text.