how to convert PWM servo signal to DC voltage

hello everyone

i what to convert a normal servo signal or pulse to proportional DC voltage how can i do this ? some thing like a ramp generator with a proportional DC out for given pulse time or length in this case .8 msec to 2.2 msec!!

or is there any simple PWM SIGNAL TO DC CONVERTER CIRCUIT ?

please help and any info is appreciated !

thanks

sahil
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