Unisys Corporation

Greg T Sullivan

Roland D Rothenberger

Kenny Yifeng Tung

A precision delay circuit in an integrated circuit chip includes a transistor switching circuit in combination with a control circuit and a compensation circuit. The transistor switching circuit receives an input signal; and in response, the transistors switch on and off at an unpredictable speed to generate an output signal with a delay that has a large tolerance. The control circuit estimates the unpredictable speed at which the transistors switch and it generates control signals that identify the estimated speed. The compensation circuit includes a plurality of compensation components for the transistor switching circuit. This compensation circuit receives the control signals from the control circuit; and in response, it selectively couples the compensation components to the transistor switching circuit such that the combination of the transistors and the selectively coupled components generates the output signal with a precise delay that has an insignificant tolerance.

Precision delay circuit

A memory in an integrated circuit chip includes an array of memory cells and a read/write circuit which performs precharge and sense operations on the array for a time interval that is set by the width of a pulse signal. This pulse signal is generated by a pulse generator circuit which contains transistors that switch on and off at an unpredictable speed; and consequently, the width of the pulse signal has a large tolerance. To decrease this large tolerance in the pulse signal, a compensation circuit is provided which includes a plurality of compensation components for the pulse generator. This compensation circuit selectively couples the compensation components to the pulse generator such that the selectively coupled components in combination with the pulse generator's transistors produce the pulse signal with a precise width that has an insignificant tolerance.

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Escondido, CA, United States of America

Greg T Sullivan