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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Often NOT due to output drivers, dude! posted by jj on May 18, 2001 at 14:23:42:
The slew rate of a bi-polar transistor three stage audio power amplifier is usually determined in the second stage. A three stage amp usually consists of a differental input stage, a gain stage where the output voltage is developed, followed by a buffer stage. The stability of the amplifier is usually established by the miller capacitance of the voltage gain stage. This capacitance is being charged by the currents in the differential input stage. It is the current limitations of the diff stage in charging the miller capacitance that determines the slew rate of the amplifier. The output stage normally has no voltage gain and only has to supply enough current to charge any capacitance on the output. This capacitance is not that great and can easilly be charged by the currents in the output stage. Driving a 4 or 8 ohm load requires more current that a few hundred picofarads of capacitance.
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- Slew Rate limitations - Comm-Tronix 19:23:40 05/18/01 (0)
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