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3.PCB serpentine traces do?

In Electronic Infomation Category: 3 | on October 28,2011

PCB soil of any one of the traces in the case of high-frequency signal will cause the signal delay time, snake-like alignment of the main role is to compensate for "the same group of related" signal line delay smaller parts that are usually there is no or less than other signal processing through the addition of logic; the most typical is the clock line, usually it without going through any other logic processing, thus the delay will be smaller than other signals.

PCBs and ASM809SEUR-T datasheet and other high-speed digital line length is to make the signal delay margin was maintained at a range, to ensure that the system reads the data in the same period of validity (difference more than one clock cycle delay when the wrong time the next cycle of data), generally require no more than the delay difference between 1 / 4 clock cycles, the delay difference per unit length of the line is fixed, the delay with line width, length, copper thickness, the lamellar structure, but the line is too long will increase the distributed capacitance and ASM809SEUR-T price and inductance, so signal quality, the clock IC pins are generally connected RC termination, but the snake is not a trace inductance from the role of the contrary, the rising edge of the inductor will signal the high- harmonic phase shift, resulting in deterioration of signal quality, so the snake-like line spacing requirements is at least twice the width, the smaller the signal rise time less vulnerable to distributed capacitance and ASM809SEUR-T suppliers and inductance effects.

because different applications have different effects, computer motherboards in the snake-like traces, mainly used in a number of clock signals, such as CI-Clk. AGPClk, it is the role of two things: the impedance matching and filter inductance.

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