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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.