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Current differencing transconductance amplifier (CDTA) with enhanced performance and its application

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Abstract

A CMOS current differencing transconductance amplifier (CDTA) with high transconductance has been proposed. The transconductance (gm) of CDTA is generally increased either by increasing the biasing current IB or by increasing the size of transistors used in differential pair and current mirror structures. The first technique leads to higher power dissipation and limited range of transconductance while the second limits the input/output swing and bandwidth of CDTA due to higher parasitic capacitances. In the proposed design of CDTA, a cross coupled PMOS active load has been used in place of conventional PMOS active load. The cross coupled PMOS active load forms a positive feedback which results in higher transconductance, wider tuning range and less power consumption without any limitations on input/output swing and bandwidth of the CDTA. Mentor Graphics Eldo simulation tool has been used to verify the performance of proposed CDTA with TSMC 0.18 µm technology parameters. A voltage/current mode oscillator circuit of third order has been designed by proposed CDTA.

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Authors and Affiliations

  1. Division of Electronics and Communication Engineering, Netaji Subhas Institute of Technology, Sector-3, Dwarka, New Delhi, Delhi, 110078, India

    Shireesh Kumar Rai & Maneesha Gupta

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  1. Shireesh Kumar Rai
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  2. Maneesha Gupta
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Correspondence to Maneesha Gupta.

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Rai, S.K., Gupta, M. Current differencing transconductance amplifier (CDTA) with enhanced performance and its application. Analog Integr Circ Sig Process 86, 307–319 (2016). https://doi.org/10.1007/s10470-015-0675-z

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  • DOI: https://doi.org/10.1007/s10470-015-0675-z

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