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A PTAT Voltage Source consisting of Subthreshold MOSFETs for Temperature Sensor LSIs
Ken Ueno,Tetsuya Asai,Yoshihito Amemiya 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
An ultra-low power temperature sensor circuit based on a subthreshold MOSFET was proposed. The sensor consists of a modified β-multiplier self biasing circuit that uses a switched capacitor resistor instead of ordinary resistors. The circuit is operated in the subthreshold region, and it generates a proportional to absolute temperature (PTAT) voltage. Simulation with SPICE demonstrated that the circuit can be used as a smart temperature sensor with ultra-low power consumption of 3.5 ㎼ or less. The accuracy of the sensor output was within ±1.5℃.
Kazuhito Yamada,Tetsuya Asai,Yoshihito Amemiya 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
We propose a single-flux-quantum (SFQ) logic system based on the reactiondiffusion-collision fusion computation. The fusion computation is a way of digital processing that performs logic operation by applying analogy of nonlinear physical and chemical systems to the structure of the logic operation. It is very powerful for implementing a given digital operation with a small number of logic gates. A fusion computation system consists of regularly arrayed unit cells, where each cell has two input arms and two output arms and is connected to its neighboring cells with the arms. Each cell accepts two input signals A and B and produces two output signals AB and AB. A fusion computation system, as a whole, can operate any combinational logic function. We designed functional SFQ circuits that implemented the fusion computation. The unit cell was able to be made with ten Josephson junctions. Circuit simulation showed that SFQ fusion computation systems could operate at very high speed, about ten times faster than conventional CMOS logic systems.
Level-shift Circuit using Subthreshold-operated CMOS Operational Amplifiers
Tomoki Iida,Tetsuya Asai,Eiichi Sano,Yoshihito Amemiya 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
A CMOS level shifter that operates as a dc-cut capacitor is proposed. This circuit consists of a differential pair and a unity-gain buffer connected to one input of the differential pair. The unity-gain buffer consists of a subthreshold-operated operational amplifier and operates very slowly. The circuit operates as a high-pass filter and transmits ac signals but cuts off a dc voltage level. Therefore it can be used to connect two analog circuits having different dc levels. The results for the simulation and fabrication of this level shifter circuit are described.
High-resistance resistors consisting of subthreshold-operated CMOS circuits
Shin’ichi Asai,Ken Ueno,Tetsuya Asai,Yoshihito Amemiya 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
We propose a CMOS circuit that can be used as an equivalent of resistors. This circuit uses a differential pair consisting of diode-connected MOSFETs and operates as a high-resistance resistor when driven in the subthreshold region. Its resistance can be controlled in a range of 1-1000 ㏁ by adjusting the driving current for the circuit. The results of the fabrication and measurement of the circuit are described.