Importance

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Abstract

The present invention relates to a double-balanced mixer circuit. The double-balanced mixer circuit consists of a first differential circuit formed of a first transistor and a second transistor connected differentially to each other for receiving a first input signal; and a second differential circuit formed of a third transistor and a fourth transistor connected differentially to each other for receiving a second input signal; either the junction of the drain or collector of the first transistor and the drain or collector of the third transistor or the junction of the drain or collector of the second transistor and the drain or collector of the fourth transistor producing an output signal having frequency information on the sum of the first input signal and the second input signal or the difference between them. The double-balanced mixer circuit is used suitably as a frequency converter which is used at the high-frequency section in a mobile communications equipment such as portable telephones. The object is to handle sufficiently with a reduced voltage of the power source and to facilitate the input operation.

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First Claim