Waveform shaping circuit

A waveform shaping circuit which shapes an input signal into an output signal having a rectangular waveform, comprising:

• first, second and third MOS transistors respectively having first, second and third terminals;
• first and second resistance elements connected between said first terminals of said first and second MOS transistors, respectively, and a supply voltage terminal;
• said second terminal of said first MOS transistor being connected to an input terminal of said circuit for receiving the input signal and said third terminal thereof being connected to said first terminal of said third MOS transistor;
• said third terminal of said third MOS transistor being connected to ground;
• said first terminal of said second MOS transistor being connected to an output terminal for supplying the output signal of said circuit and further being connected to said second terminal of said third MOS transistor to provide a feedback signal thereto;
• impedance means connected between said first terminal of said first MOS transistor and said second terminal of said second MOS transistor and comprising a first plurality of series-connected MOS transistors, each said MOS transistor of said first plurality having a shorted connection between said first and second terminals thereof;
• resistance means connected between said second terminal of said second MOS transistor and ground;
• and
• reference voltage source means connected between the common connection of said third terminal of said first MOS transistor and said first terminal of said third MOS transistor and ground and comprising a second plurality of series-connected MOS transistors, each thereof having a shorted connection between said first and third terminals thereof.