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The circuit concept of programmable logic gates based on the controlled quenching of series-connected negative differential resistance (NDR) devices is introduced, along with the detailed logic synthesis and circuit modeling. At the rising edge of a clocked supply voltage, the NDR devices are quenched in the ascending order of peak currents that can be reordered by the control gates and input gates biases, thus, providing programmable logic functions. The simulated results agree well with the experimental demonstration of the programmable logic gate fabricated by a monolithic integrated resonant tunneling diode/high electron mobility transistor technology.
Date of Publication: Feb 2003