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velocity of propagation of FR4
Catalog Datasheet  MFG & Type  Document Tags  

loss tangent of FR4Abstract: velocity of propagation of FR4 Teflon has a lower Er thus low loss The lower the Er the faster the velocity of propagation (Equation 1 , Epoxy Glass (FR4) 4 15 3 C Equation (1) V C e 0 0118 in ps (Speed of light) V e Velocity of , not tight is where the Er can change Within a single FR4 PCB a 10% variation of Er is not uncommon and this can alter the propagation velocity of the signal considerably This can lead to skew issues , stripline is longer than that of microstrip Typically microstrip has a delay of 147 ps in (FR4) and 
National Semiconductor Original 


loss tangent of FR4Abstract: FR4 dielectric constant 4.9 Velocity of Propagation Er = dieelectric constant PCB manufacturers publish a datasheet along with , not tight is where the Er can change. Within a single FR4 PCB a 10% variation of Er is not uncommon and this can alter the propagation velocity of the signal considerably. This can lead to skew issues , . The lower the Er, the faster the velocity of propagation (Equation 1), the faster the board. The key , through a stripline is longer than that of microstrip. Typically, microstrip has a delay of 147 ps/in (FR4 
National Semiconductor Original 


velocity of propagation of FR4Abstract: loss tangent of FR4 Teflon has a lower Er thus low loss The lower the Er the faster the velocity of propagation (Equation 1 , Epoxy Glass (FR4) 4 15 3 C Equation (1) V C e 0 0118 in ps (Speed of light) V e Velocity of , not tight is where the Er can change Within a single FR4 PCB a 10% variation of Er is not uncommon and this can alter the propagation velocity of the signal considerably This can lead to skew issues , stripline is longer than that of microstrip Typically microstrip has a delay of 147 ps in (FR4) and 
National Semiconductor Original 


gusqscaAbstract: FR4 dielectric constant at 2.4 Ghz electrical ) divide the physical length of the transmission line ( l physical ) by the propagation velocity , propagation velocity ( v p ) Fig. 1. Maximum physical lengths of unterminated transmission lines. Page 2 , =4.6 and Zo=50 ohms, resulting in a velocity of propagation of 165m/s. REFERENCES [1] H. Johnson and , propagation delay of a signal trace or cable was small as compared to the rise time of the digital signal , since there is no propagation time between a signal and its reflection from the end of the line. A 
TT Electronics / IRC Original 


velocity of propagation of FR4Abstract: transmission line theory electromagnetic waves velocity of propagation. Velocity in free space is V0= 1/ (0µ0) = 300x106 m/s This is an , dependent on the surrounding medium. Propagation delay is the inverse of propagation velocity W On a , Propagation Delay of Electromagnic Fields in Various Media When discussing digital design , 1.8 Coax cable (75% velocity) 129 2.3 FR4 PCB, outer trace 140 180 2.8 4.5 , then twice the propagation time Tp, or time of flight for the signals electromagnetic wave to reach 
Pericom Semiconductor Original 


velocity of propagation of FR4Abstract: 11801B Circuit Board (PCB) Test Methodology 6 3.1.2 Propagation Velocity Test Coupon General Guidelines Measurement of velocity or propagation delay is generally more difficult than impedance measurements. For , Impedance Test Coupon General Guidelines . 6 3.1.2 Propagation Velocity Test , lowcost FR4 dielectric PCBs. The combination of proper bus trace geometry and PCB test methodology are , impedance and propagation velocity. Increasing bus design speeds require improved impedance and coupling 
Intel Original 


HewlettPackard transistor microwaveAbstract: 2041620400 6 3.1.2 Propagation Velocity Test Coupon General Guidelines Measurement of velocity or , Impedance Test Coupon General Guidelines.6 3.1.2 Propagation Velocity Test , Circuit Board (PCB) trace impedance and propagation velocity. By using the methodologies described , utilizing lowcost FR4 dielectric PCBs. The combination of proper bus trace geometry and PCB test , determining trace characteristic impedance and propagation velocity. Highspeed bus designs require improved 
Intel Original 


FR4 substrate epoxy dielectric constant 4.4Abstract: FR4 dielectric constant 4.3 Microstrip characteristic impedance is: PROPAGATION VELOCITY AND INTRINSIC DELAY The velocity of , propagation delay for microstrip is: The velocity of propagation for stripline is: Where: w = trace width , DELAY Where: Ct in pF, tr in ps and T d The velocity of propagation for microstrip is the same as , for microstrip, The velocity of propagation for stripline is the same as shown in Appendix A. The , calculates the per unitlength propagation delay of a wave traveling on an unloaded microstrip or stripline 
National Semiconductor Original 


velocity of propagation of FR4Abstract: FR4 dielectric constant 4.3 DELAY The velocity of propagation for microstrip is: If w 2h (maximum error 3%). Microstrip line width is: The intrinsic propagation delay for microstrip is: The velocity of propagation for , velocity of propagation for microstrip is the same as shown in Appendix A. Where: Ct in pF, tr in ps , : The velocity of propagation for stripline is the same as shown in Appendix A. The intrinsic , scale. INTRINSIC DELAY (SIDE TWO) This scale calculates the per unitlength propagation delay of a 
National Semiconductor Original 


CITS500SAbstract: GENERAL PCB BOARD . Printed Circuit Board (PCB) Test Methodology 6 3.1.2 Propagation Velocity Test Coupon General Guidelines Measurement of velocity or propagation delay is generally more difficult than impedance , Impedance Test Coupon General Guidelines .6 3.1.2 Propagation Velocity , lowcost FR4 dielectric PCBs. The combination of proper bus trace geometry and PCB test methodology are , impedance and propagation velocity. Increasing bus design speeds require improved impedance and coupling 
Intel Original 


FR4 dielectric constant 4.3Abstract: 74376 DELAY The velocity of propagation for microstrip is: If w 2h (maximum error 3%). Microstrip line width is: The intrinsic propagation delay for microstrip is: The velocity of propagation for , INTRINSIC DELAY The velocity of propagation for microstrip is the same as shown in Appendix A. Where , delay for microstrip is: The velocity of propagation for stripline is the same as shown in Appendix , unitlength propagation delay of a wave traveling on an unloaded microstrip or stripline transmission line 
National Semiconductor Original 


AN011899Abstract: FR4 dielectric constant 4.3 velocity of propagation for microstrip is: If w 2h (maximum error 3%). Microstrip line width is: The intrinsic propagation delay for microstrip is: The velocity of propagation for stripline is , : and the intrinsic inductance is: PROPAGATION VELOCITY AND INTRINSIC DELAY The velocity of , unitlength propagation delay of a wave traveling on an unloaded microstrip or stripline transmission line , perunitlength propagation delay resulting from adding 4 pF/cm to a microstrip line having an unloaded Z0 of 
National Semiconductor Original 


FR4 dielectric constant 4.3Abstract: FR4 microstrip stub DELAY The velocity of propagation for microstrip is: If w 2h (maximum error 3%). Microstrip line width is: The intrinsic propagation delay for microstrip is: The velocity of propagation for , velocity of propagation for microstrip is the same as shown in Appendix A. Where: Ct in pF, tr in ps , : The velocity of propagation for stripline is the same as shown in Appendix A. The intrinsic , scale. INTRINSIC DELAY (SIDE TWO) This scale calculates the per unitlength propagation delay of a 
National Semiconductor Original 


AN1113Abstract: velocity of propagation of FR4 the material Since the index of refraction of FR4 material is about 4.5, propagation velocity of a , resulting in a propagation velocity of about 1.73 x 10 cm/sec, which corresponds to a propagation delay of , velocity is found to be v= Where c c = n µ c is the speed of light n is the index of , rate of propagation, then, would be the inverse of this, or 70.77 ps/cm, or 179.7 ps/inch. On an , 1.0) and that of the board material and is generally taken to be between 2.8 and 4 on FR4 10 
National Semiconductor Original 


velocity of propagation of FR4Abstract: register with 7473 routed to two or more outputs), any two outputs will exhibit less than 750ps of skew. In the synchronous , Switch connects any of the 64 inputs to any combination of 64 output channels, according to a user , each register corresponding to an output channel. The six bits are a binary numerical representation of , binary numerical representation of the output channel (ie.: 000000 corresponds to DOUT_0, 000001 , crosspoint is configured through a serial data port consisting of three pins: SERS, SERC, and SERD. SERS is 
 OCR Scan 


Abstract: operation (one input routed to two or more outputs), any two outputs will exhibit less than 750ps of skew , Crosspoint Switch VSC6464 Functional Description This Crosspoint Switch connects any of the 64 inputs to any combination of 64 output channels, according to a user defined bit pattern stored in each , output channel. The six bits are a binary numerical representation of the input channel selected (i.e , of the output channel (ie.: 000000 corresponds to DOUT_0, 000001 corresponds to D O U T_l, etc.). 
 OCR Scan 

208PQFP G522190 
G3887Abstract: VSC6464 ), any two outputs will exhibit less than 750ps of skew. In the synchronous mode, highspeed digital , Description This Crosspoint Switch connects any of the 64 inputs to any combination of 64 output channels , representation of the input channel selected (i.e.: 000000 corresponds to DIN_0, 000001 corresponds to DIN , six bits are a binary numerical representation of the output channel (ie.: 000000 corresponds to DOUT , port. The crosspoint is configured through a serial data port consisting of three pins: SERS, SERC 
Vitesse Semiconductor Original 

G3887 
MEGTRON 6Abstract: AN672 conductor embedded within it as well as the speed of signal propagation on the transmission line. Lower , separation (S) of 15 mils. For FR4, the total dielectric thickness is 18.7 mils (T+H1+H2). For the same trace , endtoend link design of a transceiver channel becomes increasingly critical to the overall performance of , this data rate, the UI is less than 36 ps. Any signal degradation of the channel can impact jitter margin and increase eye closure, resulting in increased bit error rates (BER). Two of the proposed 
Altera Original 

AN672 MEGTRON 6 100G CEI25GLR CEI28GVSR 
rogers4350Abstract: 633200 result! (Note that the velocity of propagation, v = c/r where c (the speed of light) = 0.2997mm/ps or , therefore can significantly decrease EMI, but has the penalty of slower propagation velocity (about 40 , More shielding can be achieved using microstrip without significantly impacting propagation velocity , assume that switching to LVDS (or any differential technology) will solve all of their noise problems , . Therefore, knowledge of ultrahighspeed board design and differential signal theory is required. Designing 
National Semiconductor Original 

rogers4350 633200 FR4 microstrip stub Super matched pair Rogers stripline pcb 
FR4 dielectric constant 4.6Abstract: RG6 ATTENUATION Propagation µ = magnetic permeability of the conductor and Communication on short lengths of copper , variation in propagation is caused by two different phenomena: a change in dielectric constant of the cable , 100m of RG59 Cable Table 3. D21.5 Signal Propagation Rates By using an IFT (inverse Fourier , in propagation velocity versus frequency known as dispersion. 5 Using HOTLink with Long Copper , these pieces has a small effect on the total propagation rate of signals. Most of these effects are only 
Cypress Semiconductor Original 

AN806 FR4 dielectric constant 4.6 RG6 ATTENUATION velocity of propagation of FR4 alpha industries catalog FR4 dielectric constant at 2.4 Ghz 
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