Patent ID: 6965103

Claim:
A voltage difference detector circuit, comprising: a first circuit element configured to receive a first voltage of a differential voltage pair; a second circuit element configured to receive a second voltage of the differential voltage pair; a third circuit element connecting the first circuit element to the second circuit element, the third circuit element configured such that a first current proportional to a difference between the first voltage and the second voltage passes through the third circuit element; a fourth circuit element coupled to the first circuit element and to a fifth circuit element, the fourth circuit element configured to be affected by the first current such that a second current substantially equal in amplitude to the first current passes through the fourth circuit element to the fifth circuit element when the second voltage is greater than the first voltage; and sixth circuit element coupled to the second circuit element and to the fifth circuit element, the sixth circuit element configured to be affected by the first current such that a third current substantially equal in amplitude to the first current passes through the sixth circuit element to the fifth circuit element when the first voltage is greater than the second voltage, so that the difference between the first voltage and the second voltage may be determined by reference to the second current and the third current that flow to the fifth circuit element.