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Low-voltage tunable pseudo-differential transconductor with high linearity


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Opened Access Low-voltage tunable pseudo-differential transconductor with high linearity

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Author: Gómez Galán, Juan Antonio
Pedro Carrasco, Manuel
Pennisi, Melitta
López Martín, Antonio
González Carvajal, Ramón
Ramírez Angulo, Jaime
Department: Universidad de Sevilla. Departamento de Ingeniería Electrónica
Date: 2009
Published in: ETRI Journal, 31(5), 576-584
Document type: Article
Abstract: A novel tunable transconductor is presented. Input transistors operate in the triode region to achieve programmable voltage-to-current conversion. These transistors are kept in the triode region by a novel negative feedback loop which features simplicity, low voltage requirements, and high output resistance. A linearity analysis is carried out which demonstrates how the proposed transconductance tuning scheme leads to high linearity in a wide transconductance range. Measurement results for a 0.5 μm CMOS implementation of the transconductor show a transconductance tuning range of more than a decade (15 μA/V to 165 μA/V) and a total harmonic distortion of −67 dB at 1 MHz for an input of 1 Vpp and a supply voltage of 1.8 V.
Size: 1.239Mb
Format: PDF


DOI: 10.4218/etrij.09.0109.0113

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