Patent ID: 8461900
Filing Date: 2013-06-11
Classification: H03D

Abstract:
1. A frequency converting circuit which generates a multiplied signal obtained by multiplying a local signal by an amplified signal generated by an amplifying portion comprising a first transistor having a drain terminal connected to a first power source potential, the frequency converting circuit comprising: a converter which comprises at least one second transistor having a gate terminal connected to the amplifying portion and which converts the amplified signal inputted to the gate terminal into a current signal; a switching circuit which comprises at least two third transistors whose source terminals are connected to each other and which multiplies the current signal by the local signal and generates the multiplied signal; and an impedance element which comprises a first terminal connected to a source terminal of the first transistor, a second terminal connected to a drain terminal of the at least one second transistor and a third terminal connected to the source terminals of the at least two third transistors, which supplies a first direct current from the source terminal of the first transistor and a second direct current from the source terminals of the at least two third transistors to the drain terminal of the at least one second transistor, wherein impedance of the impedance element comprises a high AC impedance between the first terminal and the second terminal.