Title :
A design scheme to stabilize the active gain enhancement amplifier
Author :
You, F. ; Embabi, S.H.K. ; Sánchez-Sinencio, E. ; Ganesan, A.
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
fDate :
30 Apr-3 May 1995
Abstract :
Active gain enhancement is an advantageous technique for designing an opamp with high DC gain and large GB. This paper presents a high frequency analysis and the design methodology of the active gain enhancement circuit. The analysis is based on an enhanced folded cascode amplifier. It explains the settling time and the stability problem of the active gain enhancement. A transfer function involving the unenhanced opamp and the auxiliary opamp is derived. From the evaluation of the transfer function it was concluded that in order to design a stable overdamped system it is important to compensate the auxiliary opamp as well as the unenhanced opamp
Keywords :
analogue integrated circuits; circuit stability; integrated circuit design; operational amplifiers; transfer functions; DC gain; GB product; active gain enhancement amplifier; design methodology; enhanced folded cascode amplifier; high frequency analysis; op amps; overdamped system; settling time; stability problem; transfer function; Circuits; Equations; Frequency estimation; Frequency response; Hip; Parasitic capacitance; Performance analysis; Poles and zeros; Transfer functions; Variable structure systems;
Conference_Titel :
Circuits and Systems, 1995. ISCAS '95., 1995 IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2570-2
DOI :
10.1109/ISCAS.1995.523808
