| negative effective mass amplifiers and generators [`neg·ǝd·iv i¦fek·tiv ¦mas `am·plǝ´fī·ǝrz ǝn `jen·ǝ´rād·ǝrz] ELECTRONICS Class of solid-state devices for broad-band amplification and generation of electrical waves in the microwave region; these devices use the property of the effective masses of charge carriers in semiconductors becoming negative with sufficiently high kinetic energies. |