Frequency conversion circuit

摘要

The present invention provides a frequency conversion circuit capable of reducing current without impairing high frequency characteristics. A local oscillator amplifier is formed of a first field effect transistor. A source thereof is grounded by a first capacitor in terms of high frequency, and a gate thereof is connected to one end of each of first and second resistors. The other end of the first resistor is grounded, and the other end of the second resistor is connected to a voltage supply terminal. An intermediate frequency amplifier is formed of a second field effect transistor. A source thereof is grounded through a third resistor and a second capacitor that are connected in parallel with each other. A drain thereof is connected to an intermediate frequency signal output terminal through a third capacitor and an intermediate frequency output matching circuit. The source of the first field effect transistor and the drain of the second field effect transistor are connected through an AC blocking circuit.