The document discusses two level clipper circuits. It describes how a two level clipper circuit uses two diodes, D1 and D2, and resistors to clip an input signal vi(t) to one of three voltage levels (VR1, Vi, or VR2) depending on the voltage range. It provides diagrams and explanations of how the circuit operates, clipping the input signal to VR1 when vi is below VR1, passing vi unchanged when it is between VR1 and VR2, and clipping to VR2 when vi exceeds VR2. The document is presented by Anil Prasad Dadi from the Department of Electronics and Communication Engineering at Anil Neerukonda Institute of Technology & Sciences.