Abstract
This paper presents two new transconductance-boosted architectures of the voltage differencing transconductance amplifier (VDTA). The first architecture (VDTA-I) relies on the technique of transconductance enhancement using partial positive feedback which is realized through negative impedance implemented using a cross-coupled amplifier. The second architecture (VDTA-II) incorporates the concept of gate-to-source voltage enhancement using an inverting amplifier for transconductance boosting. Detailed mathematical formulations for computing transconductance gain and bandwidth are presented using high-frequency small-signal equivalent circuits of both propositions. The functionality of the proposals is validated through SPICE simulations using TSMC 0.18[Formula: see text][Formula: see text]m technology parameters. Both DC and AC analyses are carried out through simulations. An enhancement in transconductance gain of 140% is observed for VDTA-I whereas for VDTA-II it is found to be 53% in comparison to the conventional VDTA. The 3[Formula: see text]dB frequencies are recorded to be 160 and 630[Formula: see text]MHz, respectively. The PVT analyses are also carried out to test the efficacy of both propositions.
Published Version
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