The search functionality is under construction.
The search functionality is under construction.

A 900 mV Single-Stage Class-AB Amplifier for a Σ-Δ Modulator with the Switched-Opamp Technique

Oh Jun KWON, Kae Dal KWACK

  • Full Text Views

    0

  • Cite this

Summary :

A 900 mV single-stage class-AB amplifier suitable for the Switched-Opamp technique is presented. To improve the slew-limited characteristics, a Dynamic Current Source (DCS) circuit which boosts the tail currents of the amplifier is proposed. The tail current of the proposed circuit is well defined and independent of technology parameters and supply variations. The tail current of the amplifier is 40 µA with zero differential voltages, while the maximum output current is nearly 900 µA. A single-loop 3rd order Σ-Δ modulator with the proposed amplifier was designed. For a 260 mV 15.625 kHz sinusoidal input signal, the simulated dynamic range of the modulator is 89 dB.

Publication
IEICE TRANSACTIONS on Electronics Vol.E92-C No.5 pp.681-685
Publication Date
2009/05/01
Publicized
Online ISSN
1745-1353
DOI
10.1587/transele.E92.C.681
Type of Manuscript
Special Section PAPER (Special Section on Fundamentals and Applications of Advanced Semiconductor Devices)
Category

Authors

Keyword