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Novel current-controlled negative resistance based on simplified negative current-controlled conveyors

A novel structure of current controlled negative resistance is presented in this paper. It has a very useful role in many analog circuits like oscillators and bandpass filters. The negative resistance circuit, which requires no external passive component, is constituted of two simplified negative second generation current controlled conveyors (CCCII−). This conveyor uses NPN bipolar transistors to transfer the signals and CMOS transistors for bias circuit. Simulation results, with Virtuoso of Cadence, are given for the conveyor CCCII− and the current controlled negative resistance with a 100 μA bias current and a ±1.5 V supply voltage. They confirm the theoretical analysis and also underline the high performances of these circuits. They are characterized by adjustable parameters through the bias current, high frequency behavior, low power consumption, and small silicon area which make them attractive for integrated circuit implementations. A comparison between these implementations and the topologies proposed in the literature is discussed.