High-frequency circuit

A high-frequency circuit comprising:

• (a) a bias circuit to which a gain control voltage is input and which controls gains of transistors arranged in said bias circuit in accordance with said gain control voltage;
• and
• (b) a band-switching circuit which switches a band and through which a reference current runs,
• wherein said band-switching circuit includes two transistors electrically connected in cascode to each other,
• one of said two transistors which is located downstream of the other has a gate electrically connected to a gain control voltage terminal through which said gain control voltage is input, and
• each of said two transistors is comprised of a complete enhancement mode field effect transistor.

A high-frequency circuit comprising:

• (a) a bias circuit to which a gain control voltage is input and which controls gains of transistors arranged in said bias circuit in accordance with said gain control voltage;
• and
• (b) a band-switching circuit which switches a band and through which a reference current runs,
• wherein said bias circuit includes at least one pair of transistors and a band-switching transistor used for switching a band,
• said band-switching transistor is electrically connected in series to a line through which said gain control voltage is supplied, and
• said gain control voltage is applied to said pair of transistors through said band-switching transistor.