Enhancing Phase-Margin of OTA Using Self-Biasing Cascode Current Mirror

Abstract

In this paper, a new adaptive biased low voltage cascode current mirror with high input/output swing is presented. This advantage is achieved using a self-biasing transistor and compensation resistor. The new structure profits from better input dynamic range and lower supply voltage without frequency response limitation and increasing input impedance. Also, the proposed current mirror is incorporated in folded cascode amplifier in order to enhance its phase-margin. The simulation results in 0.18 µm CMOS technology confirm the theoretical analysis and exhibits 478µA linear input/output current swing and a phase-margin enhancement of 12 o for the proposed current mirror and amplifier compared to the conventional circuits, respectively.

Modified recycling folded cascode OTA with enhancement in transconductanceand output impedance

“…In [9], an adaptive improved recycling folded cascode amplifier with improved gain, high slew rate, high phase margin, and reduced power consumption was discussed. In [10], a self bias cascode current mirror with frequency compensation is utilized for enhancing the phase margin of the RFC OTA. In [11], the FC OTA was * Correspondence: kumaravel.s@vit.ac.in implemented for achieving higher DC gain and unity gain bandwidth with low power consumption using the enhanced recycling technique by operating all the transistors in the subthreshold region.…”

Design and Implementation of High Gain, High Unity Gain Bandwidth, High Slew Rate and Low Power Dissipation CMOS Folded Cascode OTA for Wide Band Applications

“…This design follows three stages such as (i) Input Pair, (II) Current mirror Cascode Stage and (III) Biasing Stage. Current mirror is a one type of approach to copy current at output side [4].…”