What is the use of a buffer stage between an amplifier stage and an LPF stage? My understanding was that its for impedance matching.Or is it for holding the signal for more processing time from amplifier to LPF stage? Is the buffer is same as buffer amplifier, or they are two different circuits? If it is a buffer amplifier how do we choose the gain? Can any body of you please clear my doubts?
Many Thanks
Manju
Many Thanks
Manju