[54] PRECISION TIME DURATION DETECTOR
[75] Inventors: Chao S. Chi, Shrewsbury, Mass.;
John W. Craig, Scottsdale, Ariz.
[73] Assignee: Sperry Corporation, New York, N.Y.
[21] Appl. No.: 374,543
[22] Filed: May 3,1982
Related U.S. Application Data
[63] Continuation of Ser. No. 153,492, May 27, 1980.
[51] Int. CI.3 H03K 5/153
[52] U.S. CI 307/514; 307/351;
307/518; 328/109
[58] Field of Search 328/109, 110; 307/234,
307/514, 517, 351, 518
[56] References Cited
U.S. PATENT DOCUMENTS
3,588,710 6/1971 Masters 307/514
3,600,690 8/1971 White 307/514
3,646,455 2/1972 Coccagna 307/514
3,735,271 5/1973 Leibowitz 307/234
3,753,130 8/1973 Pezzutti 328/110
4,179,625 12/1979 Carter 307/234
4,318,047 3/1982 Dawson 307/234
Primary Examiner—John S. Heyman
Attorney, Agent, or Firm—Howard P. Terry
[57] ABSTRACT
A detector for determining whether the time duration between a positive and a negative peak of a waveform is greater or less than a predetermined time interval comprises a delay line for delaying the waveform by the predetermined time interval. A peak detector of a first polarity for detecting the first occurring peak of the waveform is responsive to the delayed waveform to provide a signal upon the occurrence of the first occurring peak thereof. A peak detector of a second polarity for detecting the second occurring peak of the waveform is responsive to the undelayed waveform for providing a signal upon the occurrence of the second occurring peak thereof. A time sequence comparator provides a first output indication when the signal from the first peak detector occurs prior to the signal from the second peak detector and a second output indication when the signal from the second peak detector occurs prior to the signal from the first peak detector.
4 Claims, 5 Drawing Figures
