Title :
Positive feedback technique for DC-gain enhancement of folded cascode Op-Amps
Author :
Farahmand, Sina ; Shamsi, Hossein
Author_Institution :
ECE Dept., K.N. Toosi Univ. of Technol., Tehran, Iran
Abstract :
In this paper, a novel folded cascode operational amplifier is proposed which improves DC-gain using positive feedback technique. This method does not affect the unity-gain frequency, stability, power dissipation, and output voltage swing of the conventional folded cascode Op-Amp. The proposed Op-Amp was designed in a standard 0.18μm TSMC 1.8V CMOS technology. Simulation results show a DC-gain enhancement of 25dB and 513MHz unity gain bandwidth for the presented Op-Amp. HSPICE simulation results confirm the theoretical estimated improvements.
Keywords :
CMOS analogue integrated circuits; circuit feedback; circuit stability; operational amplifiers; DC-gain enhancement; HSPICE simulation; TSMC CMOS technology; bandwidth 513 MHz; circuit stability; folded cascode operational amplifiers; gain 25 dB; output voltage swing; positive feedback technique; power dissipation; size 0.18 mum; unity-gain frequency; voltage 1.8 V; CMOS integrated circuits; Circuit stability; Equations; Mathematical model; Power dissipation; Stability analysis; Transistors;
Conference_Titel :
New Circuits and Systems Conference (NEWCAS), 2012 IEEE 10th International
Conference_Location :
Montreal, QC
Print_ISBN :
978-1-4673-0857-1
Electronic_ISBN :
978-1-4673-0858-8
DOI :
10.1109/NEWCAS.2012.6329006
