Patent ID: 6326820
Filing Date: 2001-12-04
Classification: H03K

Abstract:
A high-frequency high-current line driver circuit comprising:an output circuit having a first and a second output transistor configured for sourcing current to and sinking, current from an output node;an input circuit configured for sourcing current to and sinking current front the output circuit; anda biasing circuit configured for dc biasing the line driver circuit, wherein the output, input, and biasing circuits are configured to couple to voltage sources;the output circuit further comprising,a compensation circuit having a first and a second compensation transistor, the compensation circuit being configured for tying a transconductance, g.sub.m, of the first and second output transistors to a conductance, g.sub.ds, of the first and second compensation transistors, respectively, such that a g.sub.m -to-g.sub.ds ratio becomes fixed, wherein the tying stabilizes and prevents movement of a location of a compensation zero, the compensation zero being created by the compensation circuit, wherein the tying for said first output transistor utilizes a first op-amp to bias said first compensation transistor.