FM modulation circuit

Thread Starter

T silva

Joined Jun 29, 2021
I am trying to build a fm modulation circuit in proteus. Using the circuit suggested in the book 'operational Amplifier design and Application' by Burr Brown staffs. I have attached the schematic from the book. What is this '4118/15 sin/cos module' used in this schematic? I cannot find this part. Can anyone help me about this part?