Title :
A new two-stage Op-Amp using gate-driven, and positive feedback techniques
Author :
Mirzaie, Hossein ; Khameh, Hassan ; Shamsi, Hossein
Author_Institution :
Dept. of Electr. Eng., K.N.Toosi Univ. of Technol., Tehran, Iran
Abstract :
This paper describes the design and simulation of a new high-gain, low-power two-stage Op-Amp in a 0.18 μm CMOS technology. Using both the gate-driven transistor and positive feedback concepts, the DC-gain of the conventional two-stage Op-Amp is increased about 20 dB while power dissipation is approximately unchanged. Both the analytical and simulation results show that although the DC-gain will increase about 20 dB but no significant change will be made in the unity-gain bandwidth of the circuit. Besides, the settling behavior of the proposed circuit is verified by employing the Op-Amp in a flip-around sample-and-hold. It is shown that the proposed Op-Amp has better settling behavior than its conventional counterpart.
Keywords :
CMOS analogue integrated circuits; integrated circuit design; operational amplifiers; sample and hold circuits; transistors; CMOS technology; flip-around sample-and-hold circuit; gate-driven transistor; positive feedback techniques; size 0.18 mum; two-stage op-amp design; unity-gain bandwidth; CMOS integrated circuits; CMOS technology; Logic gates; Op-Amp; Positive feedback; gate-driven; sample-and-hold;
Conference_Titel :
Electronics, Circuits, and Systems (ICECS), 2010 17th IEEE International Conference on
Conference_Location :
Athens
Print_ISBN :
978-1-4244-8155-2
DOI :
10.1109/ICECS.2010.5724718
