Monday, 21 April 2014

operational amplifier - What is the purpose of the capacitor and resistor in this op-amp circuit?


Here is the op-amp circuit, which is found in this datasheet on page 5: enter image description here


I have boxed, in red, the part of the circuit that I am confused about. What is the point of having this? Thanks in advance.




Answer



It is a Zobel network also known as Boucherot cell, meant to stablize the amplifier when no load (speaker) is attached. It compensates the increasing speaker impedance at higher frequencies and prevents high frequency oscillation.


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