High speed threshold crossing detector with reset

A circuit comprising:

• first input means receiving a first voltage input signal, said first input means coupled to a first node;
• second input means receiving a second voltage input, said second input means coupled to said first node and to an output node;
• current mirror means coupled to a first voltage supply, to said first input means, and to said second input means, said current mirror means receiving a first current and generating a second current equivalent to said first current;
• DC clamping means coupled to said current mirror means increasing a minimum output voltage level.

A circuit comprising:

• first input means receiving a first voltage input signal, said first input means coupled to a first node;
• second input means receiving a second voltage input, said second input means coupled to said first node and to an output node;
• current mirror means coupled to a first voltage supply and to said second input means at said output node, said current mirror means receiving a first current and generating a second current equivalent to said first current,
• positive feedback means coupled to said first input means and said current mirror means, said positive feedback means controlled by an output voltage at said output node;
• DC clamping means coupled to said current mirror means increasing a minimum output voltage level.

A variable timer delay circuit comprising:

• first and second drain-coupled MOS transistors of different channel types receiving a voltage input, said first transistor source-coupled to a voltage supply, said second transistor source coupled to a constant current source;
• a capacitor coupled to the drains of said first and second transistors and to said voltage supply;
• threshold crossing detector having first input means coupled to a threshold voltage and second input means coupled to said capacitor, said threshold crossing detector generating a delayed output;
• and
• wherein said threshold crossing detector comprises:
• first input means receiving a first voltage input signal, said first input means coupled to a first node;
• second input means receiving a second voltage input, said second input means coupled to said first node and to an output node;
• current mirror means coupled to said second input means at said output node, said current mirror means receiving a first current and generating a second current equivalent to said first current;
• positive feedback means coupled to said first input means and said current mirror means, said positive feedback means controlled by an output voltage at said output node;
• DC clamping means coupled to said current mirror means increasing a minimum output voltage level.