Title :
A low-voltage operational amplifier with high slew-rate for sigma-delta modulators
Author :
Choi, Joongho ; Lim, Jinup ; Lim, Cheng Chew
Author_Institution :
Dept. of Electr. & Comput. Eng., Seoul Univ.
Abstract :
This paper presents the design of a low-voltage operational amplifier suitable for sigma-delta (SigmaDelta) modulator applications. The circuit technique is proposed to enhance the slew-rate performance and correspondingly can help to save the power of the amplifier. The simple circuitry of a current mirror is included with a degenerate resistor that can be selectively shunted. High-speed 2nd-order SigmaDelta modulators incorporating this technique is designed in a 0.18-mum CMOS technology and power consumption can be saved more than 20% for a power supply voltage of 1.2V
Keywords :
CMOS integrated circuits; current mirrors; low-power electronics; operational amplifiers; sigma-delta modulation; 0.18 micron; 1.2 V; CMOS technology; current mirror; degenerate resistor; low-voltage operational amplifier; sigma-delta modulators; slew-rate performance; CMOS technology; Circuits; Delta-sigma modulation; Energy consumption; Mirrors; Operational amplifiers; Power amplifiers; Power supplies; Resistors; 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.2006.1692732
