{"id":1401,"date":"2023-10-27T08:08:09","date_gmt":"2023-10-27T00:08:09","guid":{"rendered":"https:\/\/www.jingpengpcb.com\/?p=1401"},"modified":"2026-10-02T17:28:25","modified_gmt":"2026-10-02T09:28:25","slug":"pcb-design-thermal-hysteresis","status":"publish","type":"post","link":"https:\/\/www.jingpengpcb.com\/en\/blog\/pcb-design-thermal-hysteresis\/","title":{"rendered":"Thermal Hysteresis Issues in PCB Design"},"content":{"rendered":"

The reference voltage is a critical parameter that plays an important role in applications such as precision measurement systems, voltage regulators, and converters. However, when it comes to PCB (Printed Circuit Board) layout, the stability of the reference voltage may be compromised, particularly in the face of temperature fluctuations and external noise.<\/p>\n

This article will take an in-depth look at how PCB design affects thermal hysteresis in reference voltages and discuss solutions to this issue.<\/p>\n

What is thermal lag?<\/h2>\n

Thermal hysteresis refers to the lag that occurs in a physical measurement during the measurement process when a specific variable or system parameter changes. In the field of electronics, this also manifests as a change in the reference voltage. During specific temperature cycles, thermal hysteresis causes slight variations in the reference voltage, which can introduce unacceptable errors in precision measurement systems and other circuits requiring stable comparisons.<\/p>\n

\"Thermal<\/p>\n

Manifestations of Thermal Hysteresis in Circuits<\/h2>\n

In electronic devices, thermal lag is typically used to describe changes in the reference voltage. Some circuits and components that require a stable reference voltage include analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and low-dropout regulators (LDOs). These circuits require a stable reference voltage during quantization and measurement processes.<\/p>\n

Thermal Hysteresis Issues in PCB Design<\/h2>\n

In PCB design, thermal hysteresis must be taken into account when placing reference voltage sources. Due to the planar structure of semiconductor devices, thermal hysteresis cannot be completely avoided; therefore, measures must be taken during the circuit layout phase to mitigate its impact on the reference voltage.<\/p>\n

Causes of Thermal Lag<\/h2>\n

Thermal lag is caused by mechanical stress accumulated in the semiconductor die. This stress distribution is related to the die\u2019s previous temperature and the device\u2019s stress history. As the temperature changes, stress accumulates and is released at different locations within the die, resulting in fluctuations in the reference voltage.<\/p>\n

Methods for Reducing Thermal Lag<\/h2>\n

To mitigate the impact of thermal lag on the reference voltage, several measures can be taken during the PCB design and manufacturing process:<\/p>\n

    \n
  1. Placement Grooves:<\/strong> Place grooves around components that may be affected by thermal lag to increase substrate stiffness and reduce stress buildup.<\/li>\n
  2. Appropriate Component Placement:<\/strong> Placing the component away from the center of the PCB helps reduce stress buildup.<\/li>\n
  3. Panel Edge Design:<\/strong> The PCB edges provide a rigid mounting surface that prevents output voltage fluctuations caused by thermal lag.<\/li>\n
  4. Repeated Cycle Testing:<\/strong> Running the circuit through repeated cycles on the assembled PCB helps stabilize the reference voltage and reduce thermal hysteresis.<\/li>\n<\/ol>\n

    Long-Term Stability of Thermal Hysteresis<\/h2>\n

    Although thermal hysteresis is an inherent characteristic of semiconductor devices, its impact on the reference voltage can be mitigated through appropriate PCB design and manufacturing measures. In fact, in properly assembled high-precision circuits, the effects of thermal hysteresis can be reduced to a very low level, ensuring long-term stability.<\/p>\n

    \n

    FAQ<\/h2>\n

    1. What is thermal lag?<\/strong>
    \nThermal hysteresis is a phenomenon in which a physical measurement exhibits a lag during a change; in the case of a reference voltage, it manifests as a voltage change caused by temperature cycling.<\/p>\n

    2. Why is the stability of the reference voltage important?
    \n<\/strong> In precision measurement systems and other circuits, a stable reference voltage is key to ensuring the accuracy of measurements and comparisons.<\/p>\n

    3. How can thermal lag be mitigated in PCB design?<\/strong>
    \nThe impact of thermal hysteresis on the reference voltage can be mitigated through methods such as the inclusion of grooves, proper component placement, edge design, and repeated cycling tests.<\/p>\n

    4. How does thermal lag affect the performance of electronic products?<\/strong>
    \nThermal lag can cause slight fluctuations in the reference voltage, which in turn can affect the performance of electronic devices such as precision measurement systems, voltage regulators, and converters.<\/p>\n

    5. How can we ensure the long-term stability of the circuit?<\/strong>
    \nWith appropriate PCB design and manufacturing measures, the impact of thermal hysteresis on the long-term stability of the circuit can be reduced.<\/p>","protected":false},"excerpt":{"rendered":"

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