Low-power OP-AMP operating in sub-threshold region with improved slew rate

Panda, Apurbaranjan (2014) Low-power OP-AMP operating in sub-threshold region with improved slew rate. MTech thesis.



This thesis focuses on the weak inversion design of low power low voltage Op-amp. The main objective of this thesis is to improve the slew rate of the Op-amp with a very less amount of power consumption. For this purpose, an adaptive bias circuit is used to improve the slew rate of an Op-amp in sub-threshold region by increasing the drain current of the input stage transistor of Op-amp under the dynamic condition instead increasing the quiescent current to reduce the power consumption. In this thesis we present sub-threshold Op-amp circuit with two different adaptive bias topology. First, an adaptive biased circuit with WTA (Winner Take All) topology, which is used in a class A Op-amp circuit and this circuit designed using UMC 180nm technology with a supply voltage of 0.8V. The second one is an adaptive bias circuit based on current subtractor topology, this topology is used in a class AB Op-amp circuit with supply voltage of ±0.6V. This thesis presents the comparison between Op-amp with adaptive bias (both topology) and without adaptive bias circuit.

Item Type:Thesis (MTech)
Uncontrolled Keywords:Sub threshold region; Opamp; Adaptive bias; Winner Take All adaptive bias; Subtractor based adaptive bias; Slew Rate enhancement;
Subjects:Engineering and Technology > Electronics and Communication Engineering > VLSI
Divisions: Engineering and Technology > Department of Electronics and Communication Engineering
ID Code:6381
Deposited By:Hemanta Biswal
Deposited On:10 Sep 2014 14:28
Last Modified:10 Sep 2014 14:28
Supervisor(s):Islam, M N

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