A transconductance boosted CMOS current differencing transconductance amplifier (TBCDTA) and its application

This paper presents a transconductance (gm) boosted CMOS current differencing transconductance amplifier (TBCDTA). The transconductance amplifier of CDTA has been modified in TBCDTA, which results in higher and wide range of transconductance with power dissipation lying in the same range as that of existing CDTA. It has been observed that the transconductance (gm) of CDTA is varied by changing the biasing current IB which leads to higher power dissipation and limited range of transconductance. In the proposed TBCDTA, the biasing current IB is kept constant and transconductance has been boosted by connecting ‘N’ number of MOSFETs in parallel in place of conventional MOSFETs of differential pair and current mirror structures. The workability of the proposed TBCDTA has been verified by using Mentor Graphics Eldo simulation tool with TSMC CMOS 0.18 µm process parameters. A new resistorless third order voltage/current mode quadrature sinusoidal oscillator has been designed. The KHN filter designed by proposed TBCDTA gives better performance than the KHN filter designed by an existing CDTA.

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