IMPEDANCE AND PROPAGATION DELAY CHARACTERIZATION FOR FR-4 PRINTED CIRCUIT BOARDSAuthor: S. Pochareddy
Company: State Univ. of NY - Binghamton
Date Published: 2/13/2001 Conference: Pan Pacific Symposium
In this research, three 2-dimensional impedance prediction tools were compared. A 14-layer FR-4 PCB was designed as a test vehicle with different transmission line configurations and structures. A stack-up was designed with dielectric materials of varying thickness and glass to resin ratio. The test vehicle design addressed issues relating to single-ended, edge-coupled differential and coplanar impedance. Propagation delay was measured to determine the effective dielectric constant of FR4 on finished boards. Statistical analysis was performed to understand the impact of design and process parameters on impedance and propagation delay.
Keywords: PCB, TDR, OEM, FR-4, Impedance, Propagation delay.
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