Patent ID: 7411431
Filing Date: 2008-08-12
Classification: H03K,H04L

Abstract:
1. A circuit having at least at least two differential inputs and at least two corresponding differential outputs, the circuit drawing a current from a power source, the circuit comprising: a first box switch with a first differential input and a corresponding first differential output, a second box switch with a second differential input and a corresponding second differential output, wherein the first box switch and the second box switch are arranged in series with respect to the power source, wherein the current from the power source runs from the first box switch to a node and then to the second box switch, wherein the first box switch comprises; a first pair of transistors with their sources coupled together and to the power source, the gates of these transistors each coupled, respectively, to a different input signal of the first differential input signal pair, the drains of these transistors each coupled, respectively, to one of the first differential output signal pair, and a second pair of transistors of opposite polarity to the first pair, the sources of the second pair coupled together and further coupled to the node, the gates of these transistors each coupled, respectively, to one of the gates of the first pair, the drains of these transistors each coupled, respectively, to the drains of the first pair, wherein the transistors with their drains coupled together are the transistors whose gates are coupled together.