Patent ID: 6781434
Filing Date: 2004-08-24
Classification: G11C,H03K

Abstract:
A driver circuit to drive a digital transmission medium, comprising:an output terminal to connect said driver circuit to the digital transmission medium; and a switch circuit to controllably couple said output terminal to a ground node in response to a digital input signal, said output terminal being held at a supply voltage when not coupled to said ground node by said switch circuit, said switch circuit including: at least two switching transistors each having an input terminal and first and second output terminals, said first output terminal of each of said at least two switching transistors being connected to a first circuit node and said second output terminal of each of said at least two transistors being connected to a second circuit node, wherein said first circuit node is conductively coupled to said ground node, said at least two switching transistors to receive said digital input signal at corresponding input terminals thereof and to controllably couple said first and second circuit nodes in response to said digital input signal; and at least one cancellation transistor having an input terminal and first and second output terminals, said first and second output terminals of said at least one cancellation transistor being shorted together, said first output terminal of said at least one cancellation transistor being connected to said second circuit node and said second output terminal of said at least one cancellation transistor being connected to said output terminal of said driver circuit, said at least one cancellation transistor to receive an inverted version of said digital input signal at said input terminal of said at least one cancellation transistor; wherein said at least two switching transistors and said at least one cancellation transistor are each approximately the same size.