Study and Design the Current Mirror using Bulk-Driven Technique for Low Voltage Analog

Abstract

Current Mirrors are core structure for almost all analog and mixed mode circuits and the performance of analog structures largely depends on the characteristic. In this design, the design presents some of the low voltage current mirrors along with their merits and demerits, so that the selection of a suitable current mirror for a particular application will be easier. The current mirror is one such structure, which finds use in form of active load in analog circuit structures. So in this design, it presents some of the current mirrors along with parameters so that it can choose and appropriate current mirror for specific applications. In this project, the current mirror using bulk-driven technique for low voltage analog has been designed by using TSMC 0.35μ technology from mentor graphic software. The use of bulk-driven makes it possible to design low voltage current mirror for VDD is 2.5V, 2.0V and 1.8V with the IREF is equivalent to IOUT approximately about 31.5μA, 39.375μA and 43.75μA, respectively. At the common layout, the bulk for PMOS is connected to VDD which it cover the VDD and bulk with same N-Well. For this designing, the bulk is connected with external supply (V-Bulk) and does not connect to VDD. Thus the VDD and Bulk are not in the same N-Well. Therefore this technique is successfully completed until layout.