Frequency converter and radio communication apparatus with the same
First Claim
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1. A frequency converter supplied with an input signal and a local signal, comprising:
- a first mixer which frequency-converts the input signal with a first conversion gain in accordance with the local signal, to generate a first output signal;
a second mixer which frequency-converts the input signal with a second conversion gain lower than the first conversion gain in accordance with the local signal, to generate a second output signal; and
an adder which adds the first output signal and the second output signal in opposite phase to each other, to generate a frequency-converted output signal.
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Abstract
A frequency converter comprises a first mixer which frequency-converts an input signal with a first conversion gain in accordance with a local signal, a second mixer which frequency-converts the input signal with a second conversion gain lower than the first conversion gain in accordance with the local signal, and an adder which adds the output signals of the first and second mixers in opposite phase to each other in order to reduce distortion.
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Citations
19 Claims
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1. A frequency converter supplied with an input signal and a local signal, comprising:
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a first mixer which frequency-converts the input signal with a first conversion gain in accordance with the local signal, to generate a first output signal;
a second mixer which frequency-converts the input signal with a second conversion gain lower than the first conversion gain in accordance with the local signal, to generate a second output signal; and
an adder which adds the first output signal and the second output signal in opposite phase to each other, to generate a frequency-converted output signal. - View Dependent Claims (2, 3, 4, 15)
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5. A frequency converter comprising:
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a first mixer supplied with an input signal and a first local signal, which frequency-converts the input signal with a first conversion gain in accordance with the first local signal, to generate a first output signal;
a second mixer supplied with the input signal and a second local signal whose phase differs from that of the first local signal, the second mixer frequency-converting the input signal with a second conversion gain lower than the first conversion gain in accordance with the second local signal, to generate a second output signal; and
an adder which adds the first output signal and the second output signal in opposite phase to each other, to generates a frequency-converted output signal. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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16. A frequency converter comprising:
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a first mixer supplied with an input signal and a first local signal, and configured to frequency-convert the input signal with a first conversion gain in accordance with the first local signal, to generate a first output signal;
a second mixer supplied with the input signal and a second local signal whose phase differs from that of the first local signal, and configured to frequency-convert the input signal with a second conversion gain lower than the first conversion gain in accordance with the second local signal and generate a second output signal;
an adder which adds the first output signal and the second output signal in opposite phase to each other, to generates a frequency-converted output signal; and
a phase shifter supplied with an original local signal, and configured to phase-shift the original local signal and generate the first local signal and the second local signal.
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17. A frequency converter supplied with an input signal and a local signal, comprising:
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a first mixer which frequency-converts the input signal with a first conversion gain in accordance with the local signal to generate a first output signal;
a second mixer which frequency-converts the input signal with a second conversion gain lower than the first conversion gain in accordance with the local signal and is operated with an operating current lower than that of the first mixer to generate a second output signal; and
an adder which adds the first output signal and the second output signal in opposite phase to each other to generate a frequency-converted output signal.
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18. A frequency converter supplied with an input signal and a local signal, comprising:
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a first mixer which frequency-converts the input signal with a first conversion gain in accordance with the local signal to generate a first output containing a third order distortion;
a second mixer which frequency-converts the input signal with a second conversion gain lower than the first conversion gain in accordance with the local signal and is operated with an operating current lower than that of the first mixer to generate a second output containing a third order distortion having substantially the same level as that of the first output of the first mixer; and
an adder which adds the first output signal and the second output signal in opposite phase to each other, to generate a frequency-converted output signal.
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19. A frequency converter supplied with an input signal and a local signal, comprising:
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a first mixer configured to frequency-convert the input signal in accordance with the local signal to generate a first output signal;
a second mixer configured to frequency-convert the input signal in accordance with the local signal to generate a second output signal, the second mixer being designed so as to have a conversion gain lower than that of the first mixer and generate the second output signal containing a third order distortion having substantially the same level as that of the first output signal of the first mixer; and
an adder which adds the first output signal and the second output signal in opposite phase to each other, to generate a frequency-converted output signal.
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Specification