| 摘要 |
<p>Disclosed is a frequency doubling and mixing circuit capable of effecting frequency doubling operation and mixing operation with one unit of circuit. It includes a first set of differential transistor-pair (Q1,Q2) which have emitters connected in common and an emitter size ratio of K:1 (K is larger than 1), and a second set of differential transistor-pair (Q3,Q4) which similarly have emitters connected in common and an emitter size ratio of K:1. These two sets of differential transistor - pairs have respective constant electric currents (I0) supplied. In addition, it has a differential amplifying circuit (Q10,Q11,Q12) which is driven by a differential current between the common collector output of one transistor (Q2) of the first set of differential transistor-pair and one transistor (Q4) of the second set of differential transistor-pair and the common collector output between the other transistor (Q1) of the first set of differential transistor-pair and the other transistor (Q3) of the second set of differential transistor-pair. A signal to be doubled(VLO) is supplied across the common base connecting points (1,2) of the transistors which are different in emitter size, a mixing signal (VIN) is supplied from a differential input terminal of said differential amplifying circuit, and a circuit output (V0) is taken out from an output terminal (5) of said differential amplifying circuit. <IMAGE></p> |
