Dual control analog delay element

Details Dual control analog delay element Dual control analog delay element

H - Electricity

03

K

H03K 5/153 (2006.01) H03K 5/13 (2006.01)

Patent

CA 2263061

The invention is a delay element for simultaneous coarse and fine control of delay of an input clock signal. Coarse control of the delay is accomplished by varying the slope of a ramp signal while fine control is accomplished by varying a threshold voltage. The element comprises a ramp signal generator that generates repetitive ramps, a circuit for varying the slopes of the ramps of the ramp signal, a circuit for receiving a controllable threshold voltage, and a circuit that provides an output clock signal. The control voltages can be made very accurate and immune to temperature and voltage variations. Also, analog circuitry instead of digital circuitry is used.

Cette invention a trait à un élément de retard pour le réglage approximatif et précis simultané d'un signal d'horloge d'entrée. Le réglage approximatif de retard est effectué en faisant varier la pente d'un signal de rampe, tandis que le réglage précis est effectué en faisant varier une tension de seuil. L'élément comprend un générateur de signaux de rampe qui produit des rampes récurrentes. Un circuit permettant de faire varier les pentes des rampes du signal de rampe. Un circuit permettant de recevoir une tension de seuil contrôlable et un circuit qui délivre un signal d'horloge. Les tensions de commande peuvent être très précises, et insensibles aux variations de température et de tension. De plus, il est fait appel à des circuits analogiques, au lieu de circuits numériques.

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