Telex Computer Products, Inc.

Joseph P Winebarger

A power-on-reset circuit with power fail detection, comprises a supply voltage V, and a voltage divider comprising two series resistors connected between V and the ground. The junction between the two resistors is connected to the (+) terminal of a voltage comparator. The junction is also connected through a diode to the (-) terminal of the comparator. The (-) terminal is also connected to ground through a capacitor and resistor in parallel. A resistor and compacitor in series are connected between V and ground and the junction between the resistor and the capacitor is connected to the output of the comparator, and also to the input of an inverting gate. The output of the inverting gate is the power-on-reset terminal.

Power-on-reset circuit with power fail detection

A dynamic slicing compensator for attenuated pulse width modulated signals, for use at the receiving end of a transmission line which comprises a voltage comparator the negative input of which is connected to the end of the transmission line. A negative peak riding circuit is provided with sufficient time delay to substantially follow the negative peaks of the pulse width modulation signals. A reference or slicing voltage is provided, preferably approximately midway between the negative peaks and the baseline. This reference voltage is connected to the positive input of the comparator. As the attenuation and distortion increases, the negative peaks become smaller and the reference voltage similarly becomes smaller, maintaining a substantially constant ratio to the value of the negative peaks.

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Knightdale, NC, United States of America

Joseph P Winebarger