Patent ID: 6563375
Filing Date: 2003-05-13
Classification: H03G

Abstract:
A current steering circuit, comprising:first and second current sections configured and arranged to amplify a differential current input signal; and a differential current path responsive to the differential current input signal and having balanced first and second current signal paths respectively traversing the first and second current sections, the first and second current sections configured and arranged such that, in operation, the first current section drives the second current section, main current signal paths of the first and second current sections being stacked and forming the balanced first and second current signal paths, and the second current section being configured and arranged to provide a differential signal output of the current steering circuit; wherein the first current section comprises first, second, third, and fourth transistors, the emitters of the first and second transistors coupled in common, the emitters of the third and fourth transistors coupled in common, the bases of the first and fourth transistors coupled in common, the bases of the second and third transistors coupled in common, the collectors of the second and third transistors coupled in common, and the collectors of the first and fourth transistors forming a first pair of differential current output terminals.