Title :
Power-adaptive operational amplifier with positive-feedback self biasing
Author :
Kim, Byungsub ; Mandal, Soumyajit ; Sarpeshkar, Rahul
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Massachusetts Inst. of Technol., Cambridge, MA
Abstract :
This paper introduces a positive-feedback self-biasing technique for operational amplifiers (op-amps) which enables their power consumption to adapt to their environment: The power consumption of one of our op-amps scales almost linearly with load capacitance, input signal frequency, and output signal swing. Our op-amp is primarily intended for low power switched-capacitor applications. A voltage follower built in the MOSIS/AMI 0.5mum process with our op-amp has a measured power consumption that varies between 1.38muW and 90muW, as the load capacitance varies from 1pF to 100pF
Keywords :
feedback amplifiers; low-power electronics; operational amplifiers; switched capacitor networks; 0.5 micron; 1 to 100 pF; 1.38 to 90 muW; MOSIS-AMI process; low power switched-capacitor; operational amplifiers; positive-feedback self-biasing technique; power consumption; Capacitance; Circuits; Clocks; Energy consumption; Feedback; Frequency; Operational amplifiers; Power amplifiers; Rectifiers; Voltage;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1693725
