Gunn diodes and IMPATT diodes use high field effects in semiconductor materials to drive a negative resistance mode of operation. Gunn diodes and IMPATT diodes are similar, but not interchangeable.

WEEK 8: Tunnel devices: tunnel diode, backward diode, MIS tunnel diode, MIS switch diode, MIM tunnel diode, tunnel transistor. WEEK 9: IMPATT and related transit-time diodes: static characteristics, ...