A New Aspect of Negative-Resistance-Diode Bistable Circuits-Oscillatory Type and Flip-Flop Type

This paper deals with some properties of certain bistable circuits consisting of voltage-controlled or current-controlled negative-resistance diode with suitable and . The characteristic curve of the diode is divided into three regions and assumed to be linear in each region. The circuit behavior is described by secondorder linear differential equation. The load line has three intersections with the characteristic curve, so that one equilibrium point lies in each region. In this paper, two kinds of the above circuits are considered, called system A and B. To see a fundamental difference in these circuits, plane (voltage-current plane) analysis is employed. The behavior of system B is described in a single plane, while that of system A is described in two overlapped planes. It is shown that a persistent oscillation may arise by adding an appropriate trigger pulse in system A. Existence and stability problem of the oscillation using point transformation method is verified. Using Esaki diode for a voltage-controlled negativeresistance diode, and tiny diode for a current-controlled negativeresistance diode, the analysis has been checked experimentally and good agreement has been observed.