Mixing circuit
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsTaiji Akizuki, Junji Sato
Life of this patent
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Abstract
A balun converts a single-ended radio-frequency signal into differential signals. A differential matching circuit outputs a maximum-level positive-phase output signal at a lower or higher frequency than the center frequency and outputs a maximum-level reverse-phase output signal at a higher or lower frequency than the center frequency. An amplification circuit amplifies a positive-phase output signal and a reverse-phase output signal of the differential matching circuit. A mixing circuit converts the positive-phase output signal and the reverse-phase output signal that are output from the amplification circuit into intermediate-frequency signals using locally generated signals.
Claims9
A mixing circuit comprising:
- a balun that converts a single-ended radio-frequency signal into differential signals;
- a differential matching circuit that
- outputs a maximum-level positive-phase output signal of the balun at a low frequency lower than a center frequency of the radio-frequency signal and outputs a maximum-level reverse-phase output signal of the balun at a high frequency higher than the center frequency of the radio-frequency signal;
- or
- outputs a maximum-level positive-phase output signal of the balun at a high frequency higher than the center frequency of the radio-frequency signal and outputs a maximum-level reverse-phase output signal of the balun at a low frequency lower than the center frequency of the radio-frequency signal;
- an amplification circuit that amplifies a positive-phase output signal and a reverse-phase output signal of the differential matching circuit;
- and
- a mixing circuit that converts the positive-phase output signal and the reverse-phase output signal of the amplification circuit into intermediate-frequency signals using locally generated signals.
A mixing circuit comprising:
- a single-ended matching circuit that outputs a maximum-level single-ended radio-frequency signal at a center frequency of the radio-frequency signal;
- a balun that converts the output single-ended signal of the single-ended matching circuit into differential signals;
- a differential matching circuit that outputs a maximum-level positive-phase output signal of the balun at a frequency lower than or higher than the center frequency of the radio-frequency signal and outputs a maximum-level reverse-phase output signal at a frequency higher than or lower than the center frequency of the radio-frequency signal;
- an amplification circuit that amplifies a positive-phase output signal and a reverse-phase output signal of the differential matching circuit;
- and
- a mixing circuit that converts the positive-phase output signal and the reverse-phase output signal of the amplification circuit into intermediate-frequency signals using locally generated signals,
- wherein the single-ended matching circuit comprises plural series connections of a capacitor and a switch which are provided between a signal path of the single-ended radio-frequency signal and a ground.
Dependencies are inferred from the claim text.