Onchip resistance configuration by subthreshold MOSFETarray for ultra weak current sensing In this work, we propose a method to configure an ultrahigh resistance of 1Gxcexa9 or more on a chip, which is used for IV conversion circuit, in order to detect ultraweak currents of several pA  nA. In our method, a desired resistance value is realized by connecting MOSFETs in the cutoff region in seriesparallel. The influence of IV conversion characteristic, temperature characteristic, area due to the difference in the number of stages of seriesparallel connection is confirmed by simulation. Hence, an appropriate configuration method is derived. We also compare with the existing Poly resistance and discuss the practicality of proposed MOSFET resistance.

A High Accuracy Opampless Interface Circuit for 2D CrossPoint Resistive Sensor Array with Switch Resistance Calibration In this paper, a new readout method for a 2D crosspoint resistive sensor array with an opampless interface circuit is proposed. To avoid the readout inaccuracy caused by nonidealities of an opamp in the conventional readout circuit, our proposed circuit does not use any opamps. A switch resistance calibration technique is also proposed to remove effectively the negative effects of switch nonidealities, which bring high readout accuracy and wide scalability of a target resistive array. To evaluate the readout accuracy in the proposed method, simulation is carried out and the readout error less than 0.06% with 16bit ADCs in 32xc3x9732 resistive array is achieved.