Low-voltage differential signaling device and low-voltage differential signaling driver
By introducing output circuits, shutdown circuits, and substrate clamping circuits into the LVDS driver, the problem of excessive leakage current under power-off conditions is solved, achieving effective leakage protection for LVDS devices, meeting standard requirements, and improving device reliability.
WO2026108128A1 Publication Date: 2026-05-28SG MICRO CORP
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Patent Information
- Application Number
- PCT/CN2025/098380
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-11-25
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-28
AI Technical Summary
Technical Problem
Existing LVDS drivers exhibit large leakage current when the output node is short-circuited during power-off, failing to meet the self-protection requirements of the TIA/EIA-644-A standard.
Method used
The design employs an output circuit, a shutdown circuit, and a substrate clamping circuit, including a differential push-pull output circuit, a first current source, a substrate clamping circuit, and a shutdown circuit. By shutting off the current source and clamping the substrate potential in the power-off state, leakage protection is achieved.
Benefits of technology
It effectively reduces leakage current, meets the self-protection requirements of the TIA/EIA-644-A standard, and improves the reliability of LVDS equipment.
✦ Generated by Eureka AI based on patent content.
Abstract
Disclosed in the present invention are a low-voltage differential signaling device and a low-voltage differential signaling driver. An output circuit of the low-voltage differential signaling driver comprises a first current source and a differential push-pull output circuit, wherein the first current source is connected between a power source end and the differential push-pull output circuit, and the differential push-pull output circuit is connected to a differential output end of the low-voltage differential signaling driver, and is used for generating a first output voltage and a second output voltage on the basis of a first input signal and a second input signal. A turn-off circuit of the low-voltage differential signaling driver is connected to the differential output end of the low-voltage differential signaling driver and is used for turning off the first current source by using a short-circuited power source on the differential output end when the low-voltage differential signaling driver is in a leakage protection state. A first end of a substrate clamping circuit of the low-voltage differential signaling driver is connected to the power source end, and a second end thereof provides a substrate potential to a MOS transistor in the first current source. When the low-voltage differential signaling driver is in the leakage protection state, the substrate clamping circuit is in an off-state in the direction from the second end to the first end, such that effective leakage protection can still be performed on the low-voltage differential signaling driver when the low-voltage differential signaling driver is in a power-off state.
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