Title :
Comparative analysis of two versions of the Miller OA based on a systematic design method
Author :
Kovacs, Istvan ; Oros, Anamaria ; Neag, Marius
Author_Institution :
Telecommun. & IT, Tech. Univ. of Cluj-Napoca, Cluj-Napoca, Romania
Abstract :
This paper presents a clear comparison between two Operational Amplifiers (OAs) based on the same structure - the classical Miller OA - but with different solutions for dealing with the right-half plane zero (RHZ) associated to it: in one case, by inserting a resistor in series with the compensating capacitor and in the other case by using a current buffer, implemented by a cascoded transistor, to block (partially) the feedforward path causing the zero. Both OAs are designed following a systematic approach, that considers a wider set of specifications than the standard design methods reported in the literature. For a fair comparison both OAs were designed for the same set of specifications, including same power consumption and area: GBW of 500MHz for IDD=500uA, PM=60dgr for CL=1pF. Simulation results validate the design of these OAs, implemented in a standard 0.15um CMOS.
Keywords :
CMOS integrated circuits; operational amplifiers; CMOS technology; Miller operational amplifiers; cascoded transistor; compensating capacitor; current 500 muA; current buffer; frequency 500 MHz; right-half plane zero; size 0.15 mum; systematic design method; Equations; Gain; Mathematical model; Noise; Simulation; Strontium; Transistors; Miller OA; frequency compensation; systematic design;
Conference_Titel :
Design and Technology in Electronic Packaging (SIITME), 2011 IEEE 17th International Symposium for
Conference_Location :
Timisoara
Print_ISBN :
978-1-4577-1276-0
Electronic_ISBN :
978-1-4577-1275-3
DOI :
10.1109/SIITME.2011.6102729
