射频芯片测试电路设计

gukai330

gukai330

我想问一下，为何R2 r3 r5是悬空的？
11 days

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Analyzing floating resistors.

Reviewing USB-C connections.

Confirming component connections.

Assessing R5 for current sensing.

Using Knowledge Base Tool.

Using Schematic Tool.

Using the knowledge tool.

确实，这三只电阻目前是悬空的。我检查了原理图，发现它们还没有被接到目标网络上，所以被 ERC 判定为未连接。
它们各自的设计意图与正确接法如下：
  • R2 / R3：这两只标为 5.1 kΩ 的电阻是 USB‑C 受电端（UFP）的 CC 下拉电阻（Rd），用于向源端表明“我是用电设备”。应分别将其一端接到 J1 的 CC1(A5) 与 CC2(B5)，另一端接 GND。当前尚未连到 CC1/CC2，所以显示悬空。
  • R5：这只 0.1 Ω 分流电阻是做电流检测用，目标是测 USB 供电电流，应串接在 VBUS 与 LDO 输入之间。应把 J1 的 VBUS1/2/3/4 汇到 R5 的一端，R5 的另一端再接 U1 的 IN。当前没有插入 VBUS 回路，因此悬空。
建议的修复连线
  1. 将 R2 P1 接 J1:CC1(A5)，P2 接 GND；将 R3 P1 接 J1:CC2(B5)，P2 接 GND（分别标注 CC1、CC2 便于 ERC）。
  2. 将 R5 串入 VBUS：J1:VBUS1/2/3/4 -> R5:P1 -> R5:P2 -> U1:IN；同时在 R5 两端各放一个测试点做电流/电压测量。若你更想监测 3.3 V 轨电流，也可把 R5 放在 U1:OUT 与 3V3 之间，并做 Kelvin 引线到测试点。
可选细化
  • 在 USB D+/D- 近 U3 端各加 22–33 Ω 串联电阻，并在 CC1/CC2、D+/D- 加 ESD 防护器件。
  • 给 R5 两端丝印箭头标注电流方向与量测极性，便于实验。
需要我现在把以上三处连线和测试点帮你接好吗？你确定用“VBUS 侧检测”还是“3.3 V 侧检测”，我就按你的选择实施。
把CC电阻接地
确认R5测量位置
改R5阻值封装
增加测试点
加USB-C保护器件
11 days

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J3
U1 OUT - U2 VR_DIG
J1 GND4 - U1 GND
U3
J1 GND4 - U1 GND
U2 DIO0 - J4 1
X2 1 - Y1 GND
X2
R1
Resistance
10kΩ
U1 OUT - U2 VR_DIG
C4 P2 - J2 2
GND
J1 GND4 - U1 GND
J1 VBUS4 - U1 IN
C2
Capacitance
100nF
U1 OUT - U2 VR_DIG
C4 P2 - J2 2
J1 VBUS4 - U1 IN
J1 GND4 - U1 GND
U2
C3
Capacitance
100nF
C1
Capacitance
100nF
C4
Capacitance
100nF
U1
U4
J2
Y1
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