Patent ID: 6198307
Filing Date: 2001-03-06
Classification: H03K,H04L

Abstract:
An output driver circuit including an output for coupling to a conductor of a signal line, the output having an output impedance, the output driver circuit comprising:a driver circuit having an output; anda passive network connected to the output of the driver circuit and to the output of the output driver circuit, the passive network including:a series resistor including a first end directly connected to the output of the driver circuit and a second end directly connected to the signal line;a parallel resistor including a first end and a second end, the first end being directly connected to the second end of the series resistor; anda capacitor having a first terminal directly connected to the second end of the parallel resistor and a second terminal connected to a voltage supply, the capacitor providing an ac ground to passive network;wherein the series resistor and the parallel resistor of the passive network are configured to limit variation in the output impedance to a predefined range while the output driver circuit operates within a predefined range of expected operating conditions.