Ground guard structure to reduce the crosstalk noise and electromagnetic interference (EMI) in a vertical probe card for wafer-level testing

Lee, Eunjung; Lee, Man-Ho; Kim, Jonghoon J.; Kim, Mijoo; Kim, Jong-Hoon; Park, Jeoungkun; Joo, Y.S.; Bang, Yoonhee; Kim, Il; Nam, Sung-Il

doi:10.1109/isemc.2014.6898981

Cited by 1 publication

(1 citation statement)

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“…Studies have explored using a coaxial structure with pogo pins at low frequencies below 10 GHz [ 24 ]. Additionally, simulations have demonstrated a decrease in the coupling component up to 20 GHz when a metallic socket is used [ 25 ]. However, previous studies have shown a trend where mismatch increases as the frequency band rises, rendering designed probe cards unusable in the millimeter wave range and limiting verification to simulation results alone.…”

Section: Introductionmentioning

confidence: 99%

50 GHz Four-Port Coupling-Reduced Probe Card Utilizing Pogo Pins Housed in Custom Metallic Socket

Lee,

Kim,

Ahn

et al. 2024

Sensors

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A design for a pogo-pin probe card featuring a metallic socket is proposed to eliminate signal leakage and coupling loss in a multi-port environment. The proposed metallic pogo-pin socket includes a metal wall structure between adjacent pogo pins, ensuring complete isolation. This metal wall offers an advantage in removing coupling issues between pogo pins that can occur with typical dielectric pogo-pin sockets. The designed probe card is fabricated as a prototype and verified for its performance. Measurement results using a test through line show that coupled power is minimized, providing a low-loss transmission performance of −2.14 dB to an RF chip at 50 GHz, all within a compact size. Although the dielectric spacer used to secure the pogo pins allows for some leakage, it can maintain a low coupling performance of under −15 dB in the millimeter-wave band. The prototype probe card can deliver an RF signal to a 5G circuit with a low loss of −0.7 dB at 28 GHz and −1.9 dB at 39 GHz frequency. The designed probe card is capable of transmitting multiple RF signals to the RF system without signal distortion in a multi-port environment.

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Section: Introductionmentioning

confidence: 99%