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US 8,412,134 B2Granted
Filter circuit, wireless transmitter, and wireless receiver
AssigneeKabushiki Kaisha Toshiba
InventorGaku Takemura
Life of this patent
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Abstract
According to one embodiment, a radio transmitter comprises a passive mixer that mixes the radio-frequency signal and a local oscillation signal, and outputs a mixed signal to the frequency response device, thereby shifting the frequency characteristic of the frequency response device to high frequency by a local oscillation frequency of the local oscillation signal and applying the frequency characteristic shifted to high frequency on the radio-frequency signal.
Claims5
A filter circuit comprising:
- a frequency response device having a frequency characteristic;
- and
- a passive mixer that mixes an input signal and local oscillation signals having different phases by 90 degree each other, and outputs the mixed signal to the frequency response device, thereby shifting the frequency characteristic of the frequency response device according to a local oscillation frequency of the local oscillation signal and applying the shifted frequency characteristic on the input signal.
A radio communication device comprising:
- an up-converter that converts a baseband signal or an intermediate-frequency signal into a radio-frequency signal and outputs a transmitting signal;
- a frequency response device having a frequency characteristic;
- a passive mixer that is connected to the up-converter, and mixes the transmitting signal and local oscillation signals having different phases by 90 degree each other, and outputs the mixed transmitting signal to the frequency response device, thereby shifting the frequency characteristic of the frequency response device according to a local oscillation frequency of the local oscillation signal and applying the shifted frequency characteristic on the transmitting signal;
- and
- a transmission antenna that transmits the transmitting signal on which the shifted frequency characteristic is applied to a space.
2 more elements
A radio communication device comprising:
- a reception antenna that receives a radio-frequency signal propagating in a space;
- a frequency response device having a frequency characteristic;
- a passive mixer that mixes the radio-frequency signal and local oscillation signals having different phases by 90 degree each other, and outputs the mixed radio-frequency signal to the frequency response device, thereby shifting the frequency characteristic of the frequency response device according to a local oscillation frequency of the local oscillation signal and applying the shifted frequency characteristic on the radio-frequency signal;
- and
- a down-converter that is connected to the passive mixer, and converts the radio-frequency signal on which the shifted frequency characteristic is applied into a baseband signal or an intermediate-frequency signal.
2 more elements
Dependencies are inferred from the claim text.