Some developments of electrodeposited wire analog memory

The basic readout and write-in characteristics of NDRO analog memory elements composed of electrodeposited Permalloy wires were reported previously by the authors. The output signal was the second harmonic voltage of the interrogation sinusoidal-wave field (225 kHz) applied along the hard axis, and the amplitude was proportional to the product of the set flux level and square of the interrogation field. This report deals with some details of the write-in characteristics, linearization of write-in characteristics by a negative feedback circuit, and readout of the stored flux level by a fundamental component of the induced voltage, selection schemes are also discussed for practical use.