Quadrature mixer circuit
A double-balanced mixer and circuit technology, applied in electrical components, multi-frequency modulation conversion, modulation transfer and other directions, can solve the problems of useful intermediate frequency signal interference, system noise performance deterioration, affecting sensitivity and other problems, achieve low conversion loss, improve The effect of image rejection and LO RF signal isolation
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[0056] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.
[0057] like figure 1 As shown, a quadrature mixer circuit according to an embodiment of the present invention includes a double-balanced mixer, a Lange coupler and a power divider. Wherein, the power divider can output two radio frequency signals of equal amplitude and in phase; the Lange coupler can provide two equal amplitude and quadrature local oscillator signals, marked as "0" and "-90" in the figure The equal-amplitude quadrature local oscillator signals output by the two output terminals of the drive double-balance...
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