Title :
High current CMOS operational amplifier
Author :
Loikkanen, Mikko ; Kostamovaara, Juha
Author_Institution :
Dept. of Electr. & Inf. Eng., Oulu Univ., Finland
Abstract :
This paper describes a low voltage CMOS operational amplifier, which is capable of driving heavy resistive and capacitive loads. Robust and power efficient compensation is achieved by using Miller compensation together with a high bandwidth stage. Measurements show that the amplifier achieves 5.7 MHz unity gain frequency and 61° phase margin when driving 1nF||1kΩ load, while drawing 2.4mA from 1.5V supply. At 3.0V supply the amplifier is able to source or sink more than 100 mA into 1nF||10Ω load.
Keywords :
CMOS integrated circuits; low-power electronics; microwave amplifiers; operational amplifiers; 1 kohm; 1 nF; 1.5 V; 10 ohm; 2.4 mA; 3 V; 5.7 MHz; CMOS operational amplifier; Miller compensation; capacitive loads; heavy resistive loads; high current operational amplifier; low voltage operational amplifier; power efficient compensation; robust compensation; Bandwidth; Capacitance; Frequency measurement; High power amplifiers; Impedance; Operational amplifiers; Power measurement; Robustness; Transconductance; Voltage;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1464563
