Abstract
A power-efficient, high DC gain adaptive biased Current Differencing Trans-conductance Amplifier (AB-CDTA) is proposed in this paper. The proposed circuit consists of four sub-circuits namely Current Differencing Unit (CDU), Current Replication Unit (CRU), Current Squarer Unit (CSU) and Trans-conductance Amplifier Unit (TAU). The bias current of the TAU varies in a square relation with the input current difference. The proposed structure thus provides tunable gain depending on the input current difference with improved transient characteristics, reduced standby power dissipation and linearity for large range of inputs. Complete mathematical formulation has been presented to establish the characteristics of the proposed AB-CDTA. The proposed structure is validated through SPICE simulations using 180 nm CMOS technology. The proposed structure operates with a stand-by power dissipation of 47.6 µW only. Figure of merit (FoM) is also used to enumerate large signal performances of the proposed AB-CDTA. The proposed structure shows a 45.22 dB enhancement in the DC gain and a 94.29% reduction in the settling time compared to the conventional structure.
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