Author(s)

Vijaya Bhadauria, Krishna Kant, Swapna Banerjee

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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 G_m, low power dissipation and is designed for linearly tunable G_m 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 G_m of 390 μS at 1 VG_p-p @ 50 MHz. UMC 0.18 μm CMOS process technology is used for simulation at supply voltage of 1.8 V.

Analog electronics; low power Analog CMOS Circuit; Operational Transconductance Amplifier (OTA); Multiple-output OTA (MOTA); MOS Transconductors; linearly tunable G_m; Current efficiency; Linearization Techniques; Harmonic Distortion Analysis

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.