| Title |
A Study on The IC Design of 1[V] CMOS Operational Amplifier with Rail-to-rail Output Ranges |
| Authors |
전동환(Jeon, Dong-Hwan) ; 손상희(Son, Sang-Hui) |
| Keywords |
op amp ; rail-to-rail ; bulk-driven ; low voltage |
| Abstract |
A CMOS op amp with rail-to-rail input and output ranges is designed in a one-volt supply. The output stage of the op amp is used in a common source amplifier that operates in sub-threshold region to design a low voltage op amp with rail-to-tail output range. To drive heavy resistor and capacitor loads with rail-to-rail output ranges, a common source amplifier which has a low output resistance is utilized. A bulk-driven differential pair and a bulk-driven folded cascode amplifier are used in the designed op amp to increase input range and achieve 1 V operation. Post layout simulation results show that low frequency gain is about 58 ㏈ and gain bandwidth I MHz. The designed op amp has been fabricated in a 0.8μ{ textrm} m standard CMOS process. The measured results show that this op amp provides rail-to-rail output range, 56㏈ dc gain with 1 MΩ load and has 0.4 MHz gain-bandwidth with 130 ㎊ and 1 kΩ loads. |