| 摘要 |
A fully differential line driver, especially for twisted copper pairs. It comprises two current amplifiers (Ap, An), made in standard CMOS technique, each having an input (Iinp, Iinn) and an output (Iop, Ion), which latter are connected via terminal resistors (Rt) to a voltage source, which may be set to a larger voltage than that used for driving the CMOS amplifiers. With this invention, a low output impedance can be combined with a large swing. Further, feedback is not necessary, avoiding problems like potential instability. A preferred embodiment also has a very low-impedance input, making it appropriate for connecting to a DAC, thus reducing distortion of its output signal. The invention is suitable for very-high-speed-digital-subscriber-line modems. |
