Abstract
This paper presents two CMOS low-voltage rail-to-rail voltage-to-current converters (V-I converter) which could be used as basic building blocks to construct low-voltage current-mode analog VLSI circuits. In each of the circuits, 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. In the first rail-to-rail V-I converter circuit, a constant transconductance is achieved through the use of two maximum-current selecting circuits and an output subtraction stage. In the second circuit, a constant transconductance value is obtained by manipulating the DC bias currents of N- and P-type V-I converter cells. Both of the circuits can operate from rail to rail with a power supply of 3V, or less depending on the VLSI technology and the DC bias current level.
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Hung, CC., Hwang, C., Ismail, M. et al. Low-Voltage CMOS Rail-to-Rail V-I Converters. Analog Integrated Circuits and Signal Processing 13, 261–274 (1997). https://doi.org/10.1023/A:1008270232673
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DOI: https://doi.org/10.1023/A:1008270232673