Amplify an analog signal

[root2hell]

what could be most efficient way of amplifying a 100mV sinusoidal signal...??
i am using class D amplifier but stuck in designing Output filter. coz i have to choose between Phase Delay and Ripples.

 

[esp1]

hi,
One option is to use a OPA amplifier for the 100mV sinusoid.

What amplification do you require.?

E

 

[KlausST]

Hi,

*what output voltage range (min max) or what gain?
* what output current?
* what frequency?

... any other technical information for this project.

Klaus

 

[LvW]

what could be most efficient way of amplifying a 100mV sinusoidal signal...??
i am using class D amplifier but stuck in designing Output filter. coz i have to choose between Phase Delay and Ripples.

What do you mean with "most efficient"? High effieciency regarding power consumption (efficiency factor)? Or something else?

 

[root2hell]

High efficiency regarding power consumption.

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i need output voltage around 10 volts with 2A peak current to drive 8 ohm load.

 

[KlausST]

Hi,

Im wondering how slow your information come.
Frequency is still kept as secret....

In post #1 you talk about phase delay. Can you explain why this is a problem , or at least what phase delay is acceptable.
Please answer in numbers and units.

Klaus

 

[Audioguru]

2A peak into 8 ohms is 1.414A RMS which produces an output of 16W into 8 ohms. The voltage swing is 11.3V RMS or 16V peak.
Phase delay might be a problem at 20kHz if the frequency of the LC lowpass filter at the output has a cutoff close to 20kHz and you use negative feedback from the speaker to the input.

 

[root2hell]

actually i need Q=0.7,R_load=4 ohm, Phase Delay <10 Degrees. to amplify a 400 kHz SINE Wave.
Thanks!!!

 

[crutschow]

It will be difficult to achieve the 400kHz output signal characteristics you want if you use a switching amp for high efficiency.

Why is efficiency important? Is the amplifier battery powered?

 

[root2hell]

yes.
the primary issue is efficiency.

 

[Audioguru]

Why do you have more than one thread about your class-D amplifier?
In your other thread I said than nobody needs a class-D video amplifier because a video monitor is not 4 ohms and video frequencies go much higher than only 400kHz.