Circuit techniques for efficient linearised GaAs MMIC's

Novel circuit designs for monolithic microwave integrated circuit (MMIC) technology using depletion-mode GaAs MESFETs are discussed. A synthesis method leading to high-efficiency implementation of linear functions based on a square-law FET characteristic is presented and used to design a linearized isolator, which is compared with a nonlinearized design. A circuit equivalent to a common-gate FET, but with linearity, high efficiency, and reduced FET gate-width and power consumption, is proposed for future use in improved isolators and amplifiers.<>