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A systematic method is given for generating negative-resistance circuits made of 2 transistors and linear positive resistors only. The 2 transistors may be bioolar ( or ), ( -channel or p-channel), ( -channel or -channel), or their combinations. Since the circuits do not require an internal power supply, they are passive and can be integrated as a two-terminal device in monolithic form. Two algorithms are given for generating a negative-resistance device which exhibits either a type- characteristic similar to that of a tunnel diode, or a type- characteristic similar to that of a four-layered diode. Hundreds of new and potentially useful negative resistance devices have been discovered. A selected catalog of many such prototype negative-resistance devices is included for future applications.