A low-voltage operational amplifier with high slew-rate for sigma-delta modulators

A low-voltage operational amplifier with high slew-rate for sigma-delta modulators

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 curren...

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Bibliographische Detailangaben
Hauptverfasser: Joongho Choi, Jinup Lim, Cheng Chew Lim
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Circuits
CMOS technology
Delta-sigma modulation
Energy consumption
Mirrors
Operational amplifiers
Power amplifiers
Power supplies
Resistors
Voltage
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Beschreibung
Zusammenfassung: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
ISSN:0271-4302
2158-1525
DOI:10.1109/ISCAS.2006.1692732