| 摘要 |
An apparatus for providing a signal to a transmission medium. A first switching stage is connected in series between a source voltage and a transmission medium, and a second switching stage connected in series between the transmission medium and a reference line. The first and second switching stages each comprise at least one p channel transistor in parallel with at least one n channel transistor. The first and second switching stages are preferably configured to substantially symmetrically drive the transmission medium at a frequency of at least 4 gigahertz (GHz). The stages are further preferably characterized as variable resistance stages with lower resistance at the rails as compared to the midpoint of the input signal. Additional sets of stages can be provided to facilitate multiple outputs.
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