Öz The purpose of this paper is to shed further light on the operating characteristics and li- mitations of tunnel diode amplifier circuits, particularly those with different doping concentra- tions. This has been achieved by developing efficient and economical Computer programs which incorporate ali of the important material parameters and doping levels in an exact manner. The- se Computer programs are then emplçyed to study the properties of tunnel diodes in high fre- quency amplification circuits.