G - Physics – 04 – G
Patent
G - Physics
04
G
328/188, 58/22
G04G 7/00 (2006.01) G04F 10/04 (2006.01) G04F 10/10 (2006.01)
Patent
CA 1171290
File No. 720-10 ABSTRACT OF THE DISCLOSURE Apparatus for accurately timing an event relative to clock signals The apparatus given an indication of the location in time between two successive clock signals of an event to be timed. Such an event may be the arrival of a laser pulse at a satellite. An integrator circuit (C84) is charged by a relatively high charging current from a first current generator (66) during the period of time between the event and the next clock signal. The integrator circuit, is then discharged by a smaller current of opposite sign from a second current generator (80). The ratio of the charge and discharge currents "stretches" the inter clock pulse time interval to a length that can be measured by counting clock pulses as the integrator discharges. For this factor to be useful, it is essential that the charging current remains constant during charging and from one charging occasion to the next. This is achieved by keeping the generator (66) generating current constantly and by diverting the current through an integrator circuit by-pass (R78) when not integrating. Switching is done using two transistors (Q71 and Q72) that are as identical as possible, and independently controlled in phase opposition. The by pass current is detected and used to regulate the gene- rator (66). Provided both transistors deviate in the same manner from nominal characteristics, this provides accu- rate compensation for variations in the other transistor also.
388904
Arthurs & Garrett
Electronique Marcel Dassault
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