Integrated Audio Amplifiers in BCD Technology

1997
ISBN: 978-0-7923-8003-0
Verlag: Springer US

Buch, Englisch, Band 418, 210 Seiten, Format (B × H): 160 mm x 241 mm, Gewicht: 1100 g

Reihe: The Springer International Series in Engineering and Computer Science

is the first book to describe the design at Audio Amplifiers using a Bipolar CMOS DMOS (BCD) process. It shows how the combination of the 3 processes, made available by advances in process technology, gives rise to the design of more robust and powerful audio amplifiers which can be more easily implemented in digital and mixed-signal circuits.
starts with an introduction to audio amplifiers which includes a comparison of amplifier classes, general design considerations and a list of specifications for integrated audio power amplifiers. This is followed by an extensive discussion of the properties of DMOS transistors which are the key components in BCD technologies. Then the theory and the design of chargepump circuits is considered. In most BCD technologies only n-type DMOS transistors are available. Therefore a boosted supply voltage is required to achieve rail-to-rail output capability which can be generated with a chargepump. The new solutions that are found can also be used for many applications where DC-DC conversion with low output ripple is needed. Finally the design of audio power amplifier in BCD technology is discussed. The design concentrates on a new quiescent control circuit with very high ratio between quiescent current and maximum output current and on the output stage topologies. The problem of controlling the DMOS output transistors over a wide range of currents either saturated or non saturated requires a completely new design of the driving circuits that utilize of the special properties of the DMOS transistor.
is essential reading for practising analog design engineers and researchers in the field. It is also suitable as a text for an advanced course on the subject. With a foreword by

Zielgruppe

Research

Autoren/Hrsg.

Berkhout, Marco

Fachgebiete

• Technische Wissenschaften Elektronik | Nachrichtentechnik Nachrichten- und Kommunikationstechnik
• Technische Wissenschaften Elektronik | Nachrichtentechnik Elektronik Mikroprozessoren
• Technische Wissenschaften Elektronik | Nachrichtentechnik Elektronik Bauelemente, Schaltkreise

Inhaltsverzeichnis

1 Introduction.- 1.1 Integrated Audio Amplifiers.- 1.2 BCD Technology.- 1.3 Outline of this Thesis.- 1.4 References.- 2 DMOS Technology.- 2.1 Introduction.- 2.2 DMOS Device Structures.- 2.3 DMOS Device Properties.- 2.4 DMOS Process Technology.- 2.5 DMOS Versus Bipolar.- 2.6 Conclusion.- 2.7 References.- 3 Chargepump Circuits.- 3.1 Introduction.- 3.2 Voltage Multipliers.- 3.3 Chargepump Operation.- 3.4 Voltage Control.- 3.5 Chargepump Implementation.- 3.6 Conclusion.- 3.7 References.- 3.8 Appendix: Down Conversion.- 4 Chargepump Modeling.- 4.1 Introduction.- 4.2 Extended Chargepump Model.- 4.3 Modeling of Parasitic Effects.- 4.4 Conversion Efficiency.- 4.5 Conclusion.- 4.6 References.- 5 BCD Audio Amplifiers.- 5.1 Introduction.- 5.2 Output Stage Topologies.- 5.3 A BCD Amplifier Design.- 5.4 Conclusion.- 5.5 References.- 6 Conclusion.- 6.1 Conclusions.- 6.2 Recommendations.