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High frequency differential circuit, differential amplifier, differential mixer, differential oscillator, and radio circuit using same
High frequency differential circuit, differential amplifier, differential mixer, differential oscillator, and radio circuit using same
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机译:高频差分电路,差分放大器,差分混频器,差分振荡器和使用其的无线电电路
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摘要
In order to enhance a reverse isolation characteristic of a differential amplifier, which is used as, for example, an RE amplifier or a local amplifier of a mobile telephone, differential amplifier is provided which includes a differential amplification circuit for amplifying a difference in potential between two input signals in reverse phase with each other, which are inputted into Port1 and Port2, and for outputting two output signals in reverse phase with each other from Port3 and Port4; a feedback capacitor connected between Port and Port4; and a feedback capacitor connected between Port2 and Port3. Signals for canceling feedback signals are inputted into input terminals via the feedback capacitors, whereby it is possible to the reverse isolation characteristic of the differential amplifier.
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