Patent ID: 7868664

Claim:
A trigger circuit comprising: a first trigger input terminal, a second trigger input terminal, and a trigger output terminal; a first voltage source having an output terminal, said first voltage source producing a first side of a differential threshold voltage level at said output terminal of said first voltage source; a second voltage source having an output terminal, said second voltage source producing a second side of said differential threshold voltage level at said output terminal of said second voltage source; a first termination resistor having a first terminal and a second terminal, said first terminal being coupled to said first trigger input terminal and said second terminal being coupled to said output terminal of said first voltage source; a second termination resistor having a first terminal and a second terminal, said first terminal being coupled to said second trigger input terminal and said second terminal being coupled to said output terminal of said second voltage source; and a comparator having an inverting input terminal, a non-inverting input terminal, and an output terminal, said non-inverting input terminal being coupled to said first trigger input terminal, said inverting input terminal being coupled to said second trigger input terminal, and said output terminal being coupled to said trigger output terminal.