High frequency differential circuit, differential amplifier, differential mixer, differential oscillator, and radio circuit using same

A radio circuit for transmitting and receiving a radio signal, comprising an amplifier, a mixer, and an oscillator,

• wherein at least one of the amplifier, the mixer, and the oscillator includes:
• a differential amplification circuit operable to amplify a difference in potential between a first input signal and a second input signal, the first input signal and the second input signal being in reverse phase with each other, the first input signal being input into an input end of a first active element, the second input signal being input into an input end of a second active element the first and second active elements being differentially connected to each other, and the differential amplification circuit being operable to output a first output signal from an output end of the first active element and a second output signal from an output end of the second active element;
• a first passive element circuit connected between the input end of the first active element and the output end of the second active element;
• and
• a second passive element circuit connected between the input end of the second active element and the output end of the first active element,
• wherein an impedance of the first passive element circuit is set so as to transfer a signal having a sufficient intensity to cancel a feedback signal fed back from the output end of the first active element to the input end of the first active element, and
• wherein an impedance of the second passive element circuit is set so as to transfer a signal having a sufficient intensity to cancel a feedback signal fed back from the output end of the second active element to the input end of the second active element.