Design and Analysis of a Power Efficient Linearly Tunable Cross-Coupled Transconductor Having Separate Bias Control
Vijaya Bhadauria, Krishna Kant, Swapna Banerjee
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DOI: 10.4236/cs.2012.31013   PDF    HTML     4,833 Downloads   8,308 Views   Citations

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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V. Bhadauria, K. Kant and S. Banerjee, "Design and Analysis of a Power Efficient Linearly Tunable Cross-Coupled Transconductor Having Separate Bias Control," Circuits and Systems, Vol. 3 No. 1, 2012, pp. 99-106. doi: 10.4236/cs.2012.31013.

Conflicts of Interest

The authors declare no conflicts of interest.

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