Invention Grant
- Patent Title: High resolution time capture circuit and corresponding device, capture method and computer program product
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Application No.: US16851988Application Date: 2020-04-17
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Publication No.: US11204620B2Publication Date: 2021-12-21
- Inventor: Giuseppe D'Angelo
- Applicant: STMicroelectronics S.r.l.
- Applicant Address: IT Agrate Brianza
- Assignee: STMicroelectronics S.r.l.
- Current Assignee: STMicroelectronics S.r.l.
- Current Assignee Address: IT Agrate Brianza
- Agency: Slater Matsil, LLP
- Priority: IT102019000006396 20190426
- Main IPC: H03K21/00
- IPC: H03K21/00 ; G06F1/08 ; G04F10/04 ; H03K5/159 ; H03K21/02

Abstract:
A time capture circuit can measure time between edges of a logic input signal. A delay line generates consecutive increasingly delayed replicas of the logic input signal. A free running counter is clocked by a counter clock signal corresponding to an external clock signal multiplied by a clock scale factor. A counter value capture circuit captures the counter value upon occurrence of an edge in the input signal, outputs a captured counter value, and issues a trigger signal. A decoder determines a decoded value based on values of the input signal and of the plurality of consecutive increasingly replicas when the trigger signal is issued and computes a capture value as the difference of the captured counter value logical left shifted by a first scale factor and the decoded value logical right shifted by a second scale factor.
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