Title :
A novel digital controlled technique for operational amplifier compensation
Author :
Kim, Woo Jin ; Sompur, Shivakumar ; Kim, Yong-Bin
Author_Institution :
Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA
Abstract :
In this paper, a method for operational amplifier compensation is described. An operational amplifier having an offset as high as ±20 mV can be compensated to have a residual offset of as low as ±1 mV. The offset is achieved by trimming the currents in the active loads of the differential pair stage of the op-amp. The trimming currents are obtained by means of a series of binary weighted current sinks. The result of compensation can be observed digitally. and the trim data that is needed to switch on or off the current sinks can also be sent serially in digital format. In this paper, a chip has been designed which incorporates the afore-mentioned compensation technique, and the initial version of the chip without the digital interface logic has been fabricated using AMI 0.5 μm CMOS technology
Keywords :
CMOS analogue integrated circuits; compensation; differential amplifiers; operational amplifiers; 0.5 micron; CMOS; active loads; amplifier compensation; binary weighted current sinks; differential pair stage; digital controlled technique; operational amplifier; residual offset; trimming currents; Ambient intelligence; CMOS logic circuits; CMOS technology; Digital control; Logic design; Operational amplifiers; Protocols; Sun; Switches; Voltage;
Conference_Titel :
Circuits and Systems, 2001. MWSCAS 2001. Proceedings of the 44th IEEE 2001 Midwest Symposium on
Conference_Location :
Dayton, OH
Print_ISBN :
0-7803-7150-X
DOI :
10.1109/MWSCAS.2001.986151
