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Design and Analysis of a Power Efficient Linearly Tunable Cross-Coupled Transconductor Having Separate Bias Control

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Author(s): Swapna Banerjee | Krishna Kant | Vijaya Bhadauria

Journal: Advances in Molecular Imaging
ISSN 2161-6728

Volume: 03;
Issue: 01;
Start page: 99;
Date: 2012;
Original page

Keywords: Analog electronics | low power Analog CMOS Circuit | Operational Transconductance Amplifier (OTA) | Multiple-output OTA (MOTA) | MOS Transconductors | linearly tunable G&lt | sub&gt | m&lt | /sub&gt | Current efficiency | Linearization Techniques | Harmonic Distortion Analysis

ABSTRACT
A common current source, generally used to bias cross-coupled differential amplifiers in a transconductor, controls third harmonic distortion (HD3) poorly. Separate current sources are shown to provide better control on HD3) . In this paper, a detailed design and analysis is presented for a transconductor made using this biasing technique. The transconductor, in addition, is made to offer high Gm, low power dissipation and is designed for linearly tunable Gm with current mode load as one of the applications. The circuit exhibits HD3) of less than –43.7 dB, high current efficiency of 1.18 V-1 and Gm of 390 μS at 1 VGp-p @ 50 MHz. UMC 0.18 µm CMOS process technology is used for simulation at supply voltage of 1.8 V.
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