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Browse Prior Art Database

High Accuracy Real Time Clock Using a Delay Line

IP.com Disclosure Number: IPCOM000096608D
Original Publication Date: 1963-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Laumann, CW: AUTHOR

Abstract

This is a pulse timing system using magneto-striction delay lines having different delays.

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High Accuracy Real Time Clock Using a Delay Line

This is a pulse timing system using magneto-striction delay lines having different delays.

Delay lines 1, 2 and 3 each have a delay period of approximately .01 of a second. The exact delay of DL3 is slightly less than.01 of a second. This allows a pulse emitted from oscillator 20 to pass through the associated logic elements and DL3 in sufficient time to condition And 8 to pass the tenth pulse from oscillator 20. Delay lines DL2 and DL1 have delays which are successively smaller to condition And's 12 and 15 at the appropriate time. A pulse completes eleven circuits in DL2 for every ten pulse outputs from DL3. Similarly, a pulse completes eleven circuits in DL1 for every ten pulse outputs from DL2. Oscillator 20 provides a precise 1000 cps output.

When flip-flop 22 is set, And's 4, 5 and 6 pass a pulse from oscillator 20 which resets flip-flop 22 through And 7 and excites all three delay lines. And 8, clocked by oscillator 20, controls terminal 9 and And 12. And 12 controls terminal 13 and And 15. And 15 controls terminal 16.

Terminal 18 receives the output of oscillator 20 because of the direct connection. Terminal 9 is pulsed after ten cycles of oscillator 20 by the output of delay line 3. Terminal 13 is pulsed after one hundred cycles of oscillator 20, i. e., after ten cycles of delay line 3 by the output of delay line 2. Terminal 16 is pulsed after one thousand cycles of oscillator 20, i.e., after ten cycles of...