High frequency integrated circuit

A high frequency integrated circuit comprising:

• an enhancement type field effect transistor from the group consisting of an enhancement type high electron mobility transistor and an enhancement gate junction type field effect transistor;
• a depletion type field effect transistor from the group consisting of a depletion type high electron mobility transistor and a depletion gate junction type field effect transistor;
• a high frequency circuit on a GaAs compound semiconductor substrate, said enhancement type field effect transistor and said depletion type field effect transistor being on said compound semiconductor substrate,
• wherein a terminal of a capacitor is directly electrically connected to a source of the enhancement type field effect transistor and a terminal of a resistor, another terminal of the resistor being directly electrically connected to a gate of the enhancement type field effect transistor,
• wherein an input/output terminal of the high frequency circuit is directly electrically connected to a drain of the depletion type field effect transistor, a gate of the depletion type field effect transistor being directly electrically connected to a terminal of a different resistor,
• wherein a source of the depletion type field effect transistor is directly electrically connected to another terminal of the capacitor and a drain of the enhancement type field effect transistor, said drain of the enhancement type field effect transistor being electrically connectable to said input/output terminal of the high frequency circuit,
• wherein an active device is within said high frequency circuit, a passive device being within said high frequency circuit.