27.08.2006, 02:16 AM
ähhh, wozu ???
Don't worry about getting older. You're still gonna do dump stuff...only slower
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Was könnte das werden?????
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27.08.2006, 04:22 PM
1. um den Dreieckgenerator einzusparen
2. um die schwinggefährdete NF-loop zu umgehen
3. um möglicherweise weiter aussteuern zu können
4. um sich zu beweisen, dass mans kann
2. um die schwinggefährdete NF-loop zu umgehen
3. um möglicherweise weiter aussteuern zu können
4. um sich zu beweisen, dass mans kann
27.08.2006, 06:06 PM
soso,
ad 4. das is dein job
ad 3. voll/clip geht, was soll noch mehr ???
ad 2. loop zur arbeitspunkt einhaltung sinnvoll, will ich nicht weglassen
ad 1. dr.gen. kostet ca 30 ct, da liegt echt sparpotential
i.ü. selbst.erregend dürfte mehr (!) stabilitätsprobleme machen,
mir dünkt nur eine möglichkeit: eine halbbrücke > hf feedback als oszillator , nf feedback über gezeigte summe-differenz-schaltung
ad 4. das is dein job
ad 3. voll/clip geht, was soll noch mehr ???
ad 2. loop zur arbeitspunkt einhaltung sinnvoll, will ich nicht weglassen
ad 1. dr.gen. kostet ca 30 ct, da liegt echt sparpotential
i.ü. selbst.erregend dürfte mehr (!) stabilitätsprobleme machen,
mir dünkt nur eine möglichkeit: eine halbbrücke > hf feedback als oszillator , nf feedback über gezeigte summe-differenz-schaltung
Don't worry about getting older. You're still gonna do dump stuff...only slower
28.08.2006, 01:35 PM
Also nichts mehr verbesserungsfähig ? 
Ich hasse fix-fertige Lösungen, die derart genial sind, dass man nix mehr dran verbessern kann
Ich hasse fix-fertige Lösungen, die derart genial sind, dass man nix mehr dran verbessern kann
28.08.2006, 08:40 PM
zu verbessern gibts sicher einiges, was sich aber erst beim realen aufbau zeigen wird... 
zum thema bd modulator von texas:
[P]Class-D audio power amplifiers use switched output devices to produce
power with high efficiency. Various techniques are available for
controlling switching patterns. A technique called BD modulation
permits filter-free operation in many applications, reducing cost and
complexity. The broad output spectrum of a Class-D amplifier can
produce EMI if it is not properly controlled. Solutions to this problem
are often considered black magic.[/P]
zum thema bd modulator von texas:
[P]Class-D audio power amplifiers use switched output devices to produce
power with high efficiency. Various techniques are available for
controlling switching patterns. A technique called BD modulation
permits filter-free operation in many applications, reducing cost and
complexity. The broad output spectrum of a Class-D amplifier can
produce EMI if it is not properly controlled. Solutions to this problem
are often considered black magic.[/P]
Don't worry about getting older. You're still gonna do dump stuff...only slower
31.08.2006, 10:53 AM
...nun sind wir wieder eingeschlafen
31.08.2006, 11:38 AM
Ne ne ne,
manche sind am löten
, und die anderen sind im Urlaub.
Kleinen Auszug aus einer Mail die ich bekommen habe:
Class-D audio power amplifiers use switched output devices to produce power with high efficiency. Various techniques are available for controlling switching patterns. A technique called BD modulation permits filter-free operation (operation without an output filter) in many applications, reducing cost and complexity.
The output devices in a Class-D amplifier operate primarily in saturation, with low voltage drops and power dissipation. Class-D amplifier efficiency can be as high as 95%, so Class-D amplifiers can reduce heat generation in high-power applications and increase battery life in handheld applications. These advantages contrast sharply with the low-efficiency of Class-AB amplifiers, as much as 25% in average operation.
The broad output spectrum of a Class-D amplifier can produce EMI if it is not properly controlled. Solutions to this sort of problem are often considered black magic. However, it is reasonably easy to achieve EMC through knowledge of EMI filter component characteristics and PCB layout principles.
The discussion will include a special focus on BD modulation as well as elements of EMC testing, filter component characteristics and proper PCB layout. We will conduct several lab sessions, including one in a working EMI chamber to illustrate EMI testing.
Gruß
manche sind am löten
, und die anderen sind im Urlaub. Kleinen Auszug aus einer Mail die ich bekommen habe:
Class-D audio power amplifiers use switched output devices to produce power with high efficiency. Various techniques are available for controlling switching patterns. A technique called BD modulation permits filter-free operation (operation without an output filter) in many applications, reducing cost and complexity.
The output devices in a Class-D amplifier operate primarily in saturation, with low voltage drops and power dissipation. Class-D amplifier efficiency can be as high as 95%, so Class-D amplifiers can reduce heat generation in high-power applications and increase battery life in handheld applications. These advantages contrast sharply with the low-efficiency of Class-AB amplifiers, as much as 25% in average operation.
The broad output spectrum of a Class-D amplifier can produce EMI if it is not properly controlled. Solutions to this sort of problem are often considered black magic. However, it is reasonably easy to achieve EMC through knowledge of EMI filter component characteristics and PCB layout principles.
The discussion will include a special focus on BD modulation as well as elements of EMC testing, filter component characteristics and proper PCB layout. We will conduct several lab sessions, including one in a working EMI chamber to illustrate EMI testing.
Gruß