Abstract
An improved CMOS second generation current conveyor with adaptive control circuit (ACC) is proposed, and is used to build a highly linear transconductance–transimpedance programmable gain amplifier (PGA). This PGA is fabricated in a 0.18- $\mu \text{m}$ CMOS technology and draws a 0.58-mA current from a supply of 1.8 V. It achieves a 0–14-dB-gain range within a roughly constant bandwidth of 30 MHz when driving a capacitor load of 2 pF. Enhanced linearity, extended input range, and improved common-mode rejection are achieved due to the employ of the proposed ACC. In addition, gain peaking is less prone to appear as the proposed ACC contributes a significant reduction in ${X}$ terminal parasitic capacitance.
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