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A low-voltage rail-to-rail CMOS V-I converter

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4 Author(s)
Chung-Chih Hung ; Analog VLSI Lab., Ohio State Univ., Columbus, OH, USA ; Ismail, M. ; Halonen, K. ; Porra, Veikko

This paper presents CMOS low-voltage rail to-rail voltage-to-current (V-I) converters which could be used as basic building blocks to construct low-voltage current-mode analog very large scale integration (VLSI) circuits. In the circuit, an n-type V-I converter cell is connected in parallel with its p-type counterpart to achieve common-mode rail to-rail operation. A linear differential relationship of the n-type V-I converter, or its p-type complement, is obtained using a new class-AB linearization technique. The constant transconductance value is obtained by manipulating the DC bias currents of n- and p-type V-I converter cells. The circuit can operate from rail to rail with a power supply of 3 V or less, depending on the VLSI technology and the DC bias current level

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:46 ,  Issue: 6 )