HOW TO increase the class-d's gain?

aobuke · 11th February 2009, 10:34 AM

HOW TO increase the class-d's gain?
i use the multisim make a class-d amplifier,
but the result is worse,when 8KHz(-1v~1v) sin is in,the output
is only -1.6v~1.6v,how to increase it ?

Saturnus · 11th February 2009, 02:23 PM

Increase R4

aobuke · 13th February 2009, 07:33 PM

Increase R4£¿

but i think the R4 is the integral resistance,I think it doesn't matter with the CLASS-D'gain.

Saturnus · 13th February 2009, 08:17 PM

Could be wrong but to me it looks like the feedback resistor.

Since the gain is set by the relationship between the input resistor and the feedback resistor. Either increase the feedback resistor or decrease the input resistor.

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11th February 2009, 02:23 PM	#2
Saturnus diyAudio Member Join Date: Jun 2005 Location: Copenhagen, Denmark	Increase R4

13th February 2009, 07:33 PM	#3
aobuke diyAudio Member Join Date: Aug 2008	Increase R4£¿ but i think the R4 is the integral resistance,I think it doesn't matter with the CLASS-D'gain.

13th February 2009, 08:17 PM	#4
Saturnus diyAudio Member Join Date: Jun 2005 Location: Copenhagen, Denmark	Could be wrong but to me it looks like the feedback resistor. Since the gain is set by the relationship between the input resistor and the feedback resistor. Either increase the feedback resistor or decrease the input resistor.

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