Low-voltage tunable pseudo-differential transconductor with high linearity
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 re...
| Authors: | , , , , , |
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| Format: | article |
| Publication Date: | 2009 |
| Country: | España |
| Institution: | Universidad de Sevilla (US) |
| Repository: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/23358 |
| Online Access: | http://hdl.handle.net/11441/23358 https://doi.org/10.4218/etrij.09.0109.0113 |
| Access Level: | Open access |
| Keyword: | Analog CMOS circuits Linear resistor Operational transconductance amplifier (OTA) Low-power Low-voltage circuit |
| Summary: | 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. |
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