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A transconductance improvement technique for a bulk-driven operational transconductance amplifier (OTA) working in the weak inversion region is presented. Using the quasi-floating gate method, the proposed technique achieves larger transconductance improvement than conventional approaches with the CMOS technologies scaling. Moreover, its enhanced performance is at no expense of the power budget. Simulated...
A super class-AB bulk-driven (BD) operational transconductance amplifier (OTA) with improved slew rate (SR) is presented. The proposed OTA utilises bulk flipped voltage follower for the BD input stage and a nonlinear current mirror for the active load to enhance the SR of conventional BD counterpart. Both the traditional and the proposed OTA, have been simulated on the UMC 180 nm process, and results...
A systematic methodology for opamp synthesis is presented. Based on this methodology, an automatic computer-aided design (CAD) tool called OTACAD is developed. OTACAD directly uses HSPICE as the simulator and a lookup table to model MOSFET in saturation region without complex equations. So it can design opamps in deep-sub-micron technologies and is suitable for various CMOS processes. Then, A sample...
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