Enhancing Accuracy and Narrow Pulse Detection in Automotive and Industrial LiDAR with LVDS Comparators
Figure 1 Concept Diagram for Time-of-Flight Pulse Detection with ComparatorSee more about this use case in How to design with high speed comparators in automotive and industrial systems and our Intro to high speed comparators: ToF distance measurements with LVDS comparator videos.
Design Challenges
- Depending on the reflectivity or distance of an object, the received pulse amplitude can be reduced.
- To maintain consistent propagation delay regardless of pulse amplitude.
- Measuring distances from far away objects requires higher amplitudes and narrower pulses to maintain power, as described in When to Use High-Speed Comparators or ADCs for Distance Measurements in Optical Time-of-Flight Systems.
How High Speed Comparators Benefit the System
- Low overdrive dispersion contributes to consistent measurements by reducing pulse amplitude sensitivity.
- Super-fast propagation delay enables time sensitive measurements to occur.
- Narrow pulse width detection capability makes possible detecting objects at farther distances.
- LVDS and single-ended comparator output options are available depending on downstream device requirements.
| Part Number | Output Type | Min. Pulse Width | tPD | tOD_DISPERSION | Supply Range (V) |
|---|---|---|---|---|---|
| TLV3801/11, TLV3801-Q1 | LVDS | 240ps | 225ps | 5ps | 2.7 to 5.25 |
| TLV3601/2/3, TLV3601/2/3-Q1 | Push-Pull | 1.25ns | 2.5ns | 600ps | 2.4 to 5.5 |
| TLV3604, TLV3605 | LVDS | 600ps | 800ps | 350ps | 2.4 to 5.5 |
| TLV3901 (Preliminary) | CML | 80ps | 150ps | 5ps | 3.1 to 5.5 |
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