Performance enhancement of current differencing transconductance amplifier (CDTA) by using a new approach of gm boosting and its application

Kumar, Shireesh; Gupta, Maneesha

doi:10.1016/j.ijleo.2016.04.075

Cited by 10 publications

(2 citation statements)

References 28 publications

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“…Therefore, the slight deviation in the boosting of transconductance gains is observed when source degeneration resistances are the reported structure of CDTA. Only 2 structures reported in [20] and [34] have greater GBW but their power dissipations are much more than the proposed HTG-CDTA-II. It is also observed that the bandwidth of proposed HTG-CDTA-II has been increased by more than 5 times over the bandwidth of HTG-CDTA-I while power dissipations of both structures remain in the same range.…”

Section: Simulation Results Of Htg-cdta-imentioning

confidence: 88%

“…In another circuit of CDTA, partial positive feedback and parallel MOSFETs in place of differential pair have been used in order to achieve significant range and values of transconductance [33]. A high performance CDTA has been reported in [34] where the transconductance is boosted by combining the output of 2 current mirror structures. Recently, a paper has been published on transconductance boosting by utilizing common source amplifiers in between gate and source terminals of differential pair MOSFETs.…”

Section: Introductionmentioning

confidence: 99%

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A novel design of current differencing transconductance amplifier with high transconductance gain and enhanced bandwidth

Kumar¹,

Pandey²,

Garg³

et al. 2021

Turk J Elec Eng & Comp Sci

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In this paper, transconductance gain of current differencing transconductance amplifier (CDTA) has been boosted by using a novel approach. Transconductance is generally varied by two well-known techniques. In the first technique, bias current of differential pair MOSFETs is varied whereas in the second technique, aspect ratios of differential pair MOSFETs are changed. The drawbacks of first technique are limited range of transconductance and higher power dissipation whereas second technique restricts dynamic range, output swing and bandwidth of CDTA. To overcome these drawbacks, 2 new structures of CDTA, namely high transconductance gain CDTAs (HTG-CDTA-I & HTG-CDTA-II) have been proposed. HTG-CDTA-I utilizes partial positive feedback in the active loads of differential pair MOSFETs to increase the transconductance gain. The partial positive feedback reduces the linear range of HTG-CDTA-I that is counter balanced by employing source degeneration resistors. In addition, parallel MOSFETs are used in the structures of current mirrors to achieve higher value of transconductance. To enhance the bandwidth of proposed HTG-CDTA-I, another structure known as HTG-CDTA-II has also been proposed. In this structure, compensation resistors are connected at the gate terminals of driver MOSFETs of current mirrors. To prove the worthiness of proposed HTG-CDTA-II, KHN filter is realized and its advantages have been discussed.

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Section: Simulation Results Of Htg-cdta-imentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%