Title :
A novel modelling and optimisation of gain-boosted cascode amplifiers for high speed applications
Author :
Ahmadi, Mohammad Mahdi
Author_Institution :
Electr. Eng. Dept., Sharif Univ. of Technol., Tehran, Iran
Abstract :
Gain-boosted cascode amplifiers are good choices for power optimized high-speed amplifiers. In this paper, after a comprehensive study on the pole-zero locus and time response, a generic and perfect model is developed for these amplifiers. By the help of this novel modeling method, the optimum parameters for the feedback or auxiliary amplifier are determined, in order to eliminate the well-known slow timing component in the step response and obtain the minimum achievable settling time. The required circuit conditions as well as a straightforward design procedure for realizing the results of the analytic analysis are presented, finally.
Keywords :
CMOS analogue integrated circuits; circuit optimisation; feedback amplifiers; frequency response; high-speed integrated circuits; integrated circuit modelling; operational amplifiers; poles and zeros; step response; transfer functions; auxiliary amplifier; closed loop transfer function; feedback amplifier; gain-boosted cascode amplifiers; generic model; minimum achievable settling time; optimum design; optimum parameters; pole-zero locus; power optimized high-speed amplifiers; step response; time response; Boosting; Circuits; Equations; Feedback amplifiers; Feedback loop; High power amplifiers; Independent component analysis; Time factors; Timing; Transfer functions;
Conference_Titel :
Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003 10th IEEE International Conference on
Print_ISBN :
0-7803-8163-7
DOI :
10.1109/ICECS.2003.1301877
