Amplify an analog signal

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root2hell

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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.
 

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

What amplification do you require.?

E
 

Hi,

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

... any other technical information for this project.

Klaus
 

root2hell said:
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.
Click to expand...

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

High efficiency regarding power consumption.

- - - Updated - - -

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

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
 
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    FvM

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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.
 

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

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?
 

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.
 

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