Output characteristics stabilization of CMOS devices
Method of programming a desired source resistance for a driver stage
Driver circuitry adjusted to allow high speed driving and reduce potential variations of interconnections Patent #: 5686853
AbstractAn apparatus including a low voltage differential signaling (LVDS) driver circuit with on-resistance cancellation, includes a current steering circuit having an on-resistance. In order to cancel the on-resistance of the current steering circuit, the LVDS driver circuit also includes a current proportional to absolute temperature current source, a transistor having an on-resistance proportional to the on-resistance of the current steering circuit, and a voltage-to-current conversion circuit coupled to the transistor, wherein the voltage-to-current conversion circuit converts the drain-to-source voltage of the transistor into a current proportional to an output current of the LVDS driver circuit. A first resistive circuit receives the current proportional to absolute temperature and the current proportional to an output current of the LVDS driver circuit and in accordance therewith provides a first reference signal. This first reference signal is received by a voltage generating circuit which generates two reference voltage signals that are supplied to the current steering circuit.