By Bob Cordell
Master the artwork of audio strength amplifier design
This complete booklet on audio strength amplifier layout will entice individuals of the pro audio engineering group in addition to the hobbyist. Designing Audio strength Amplifiers starts off with strength amplifier layout fundamentals beginner can comprehend and strikes throughout to in-depth layout concepts for the very refined audiophile audio strength amplifier clothier. this can be the only most sensible resource of data for someone who desires to layout an audio energy amplifier, even if for enjoyable or revenue. advance 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
* figuring out damaging suggestions and the talk surrounding it
* complicated detrimental suggestions repayment recommendations
* refined 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 on hand 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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Additional info for Designing Audio Power Amplifiers
Indeed, these junctions store charge, and that is a characteristic of capacitance. A reverse-biased junction has a so-called depletion region. The depletion region can be thought of roughly as the spacing of the plates of the capacitor. With greater reverse bias of the junction, the depletion region becomes larger. The spacing of the capacitor plates is then larger, and the capacitance decreases. The junction capacitance is thus a function of the voltage across the junction, decreasing as the reverse bias increases.
6 Mrad/s. 1 µF Needless to say, this is a real eye-opener! This explains why it can be difficult to turn off a power transistor quickly. Suppose the current gain of the power transistor is 50, making the base current 20 mA. 4 mV/µs Recall that a 60 mV change in Vbe will change the collector current by a factor of about 10. 1 A. This illustrates why it is important to actively pull current out of the base to turn off a transistor quickly. This estimate was only an approximation because it was assumed that Cπ was constant during the discharge period.
This is essentially positive feedback in a local feedback system. The Vbe of power transistors will start out at a smaller voltage at a low collector current of about 100 mA, but may increase substantially to 1 V or more at current in the 1 to 10-A range. At currents below about 1 A, Vbe typically follows the logarithmic rule, increasing by about 60 mV per decade of increase in collector current. As an example, Vbe might increase from 550 mV at 150 mA to 630 mV at 1 A. Even this is more than 60 mV per decade.