The low-high-low I-V characteristics of five to seven peaks based on four NDR devices

Some novel five-peak, six-peak, and seven-peak current-voltage (I-V) characteristics of four series-connected negative differential resistance (NDR) devices are investigated and demonstrated in this paper. Especially, the peak currents of these novel I-V characteristics are presented as a low-high-low situation. However, the magnitude of each peak current is almost the same or from low to high values gradually in traditional structure that connects identical devices in series. The results of this paper can provide some ideas for integrated circuits based on NDR devices.