Low cost field effect transistor measurements and applications

Abstract

The field effect transistor (FET) has emerged as an important active device. Low cost FETs (about one dollar) are now available which should substantially enlarge the FET market. Measurements on and applications of various low cost FETs are discussed pointing out advantages and disadvantages of particular devices and circuits. Basic FET operation and terminology is discussed including the specification sheet, DC biasing, small signal representation^ and measurements of device parameters. Mixer, tuned amplifier, oscillator, and detector circuits were constructed and tested. Low noise characteristics are examined and a brief treatment of other applications is given.