By Bob Cordell
Master the artwork of audio strength amplifier design
This entire ebook on audio strength amplifier layout will entice participants of the pro audio engineering neighborhood in addition to the hobbyist. Designing Audio strength Amplifiers starts off with strength amplifier layout fundamentals beginner can comprehend and strikes all through to in-depth layout suggestions for the very refined audiophile audio energy amplifier fashion designer. this is often the one most sensible resource of data for an individual who desires to layout an audio energy amplifier, even if for enjoyable or revenue. strengthen and hone your audio layout talents with in-depth assurance of those and different issues:
* fundamentals of audio strength amplifier layout
* MOSFET strength amplifiers and mistake correction
* Static and dynamic crossover distortion demystified
* knowing damaging suggestions and the debate surrounding it
* complex adverse suggestions reimbursement innovations
* subtle DC servo layout
* Audio measurements and instrumentation
* ignored assets of distortion
* SPICE simulation for audio amplifiers, together with an instructional
* SPICE transistor modeling, together with the EKV version for energy MOSFETs
* Thermal layout and using ThermalTrak transistors
* 4 chapters dedicated to category D amplifiers
Supplemental fabric to be had at www.cordellaudio.com includes:
* Ready-to-run amplifier simulations
* Key transistor types
* different bonus materials
Uploader's note: seems to be a retail copy.
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Extra resources for Designing Audio Power Amplifiers
Example text
It is thus easy to see how rather high Vbe can develop for power transistors at high operating currents. The Gummel Plot If the log of collector current is plotted as a function of Vbe, the resulting diagram is very revealing. As mentioned above, it is ideally a straight line. 2 Transistor Gummel plot. more useful and insightful if base current is plotted on the same axes. This is now called a Gummel plot. It sounds fancy, but that is all it is. The magic lies in what it reveals about the transistor.
Transconductance While transistor current gain is an important parameter and largely the source of its amplifying ability, the transconductance of the transistor is perhaps the most important characteristic used by engineers when doing actual design. Transconductance, denoted as gm, is the ratio of the change in collector current to the change in base voltage. The unit of measure of transconductance is the siemens (S), which corresponds to a current change of 1 A for a change of 1 V. This is the inverse of the measure of resistance, the ohm (it was once called the mho, ohm spelled backward).
Early Effect The Early effect manifests itself as finite output resistance at the collector of a transistor and is the result of the current gain of the transistor being a function of the collector-base voltage. 1 show that the collector current at a given base current increases with increased collector voltage. This means that the current gain of the transistor is increasing with collector voltage. This also means that there is an equivalent output resistance in the collector circuit of the transistor.