Motorola Corporation

Edmund C Golbeck

Charles Gerston

A random bit stream generator and method including a regulated current source for generating a noise signal, an amplifier coupled to the regulated source for producing an amplified noise signal, a filter coupled to the amplifier for averaging the random bit stream and producing a feedback input, a comparator coupled to the amplifier and the filter for receiving the amplified noise signal and the feedback input and producing a digital signal, a flip-flop coupled to the comparator for receiving the digital signal and for producing the random bit stream, and quick start circuitry coupled to the amplifier, the comparator, and the flip flip for ensuring randomness in the random bit stream from generator start up.

Random bit stream generator and method

Amplifier circuitry includes a differential pair of transistors having commonly connected electrodes driven by a normally constant current supply transistor. Portions of the output signals developed by the differential transistors tend to vary with variations in the magnitude of a first power supply potential. A control circuit causes the magnitude of the normally constant current source to vary so that the other excursions of the output signal are substantially equal in magnitude to the first power supply potential to provide balanced signals across the load. A feedback circuit stabilizes the magnitude of the normally constant current supply transistors against variations in the magnitude of another power supply potential or in the constant current supply.

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Scottsdale, AZ, United States of America

Edmund C Golbeck