How to amplify a PWM signal ?

[gsg]

Hi,

I am controlling the speed of a motor from a PWM signal at 20kHz. The max voltage I'm getting at 100% duty cycle is around 2V. The motor requires 0 to 10v dc. I have an RC filter in place which is working fine.

But how do I amplify this to a variable 0-10v dc? I can put the filter either before or after the filter. I tried simulating this circuit in Multisim but it doesn't give an amplified output and the response time is also very slow

Can someone give me another circuit please?

Thanks

 

[gsg]

Re: PWM amplifier

Here's another circuit i tried simulating.
Can this be improved??