/How to solve the problem of PCB circuit board on-line dividing machine?
Any long signal path on an online splitter PCB can be considered a transmission line, and if the delay in transmission is a much shorter uptime signal, the rise in signal generation reflects that yahweh must be submerged.No longer will the overshoot, recoil and ringing sound, most existing MOS circuits, because the uptime line propagation delay ratio is greater, so alignment can grow in meters without signal distortion.Faster logic circuits, especially high-speed emitter coupled logic.
The integrated circuit of the on-line splitter, due to the high speed, has no other measures for the edge, the tracking length must be shortened in order to maintain signal integrity.
Online points machine there are two ways to make the circuit work in a relatively long line no serious waveform distortion, TTL down along the rapid schottky diode clamp method, that is excessive in more than one diode below ground potential, which reduces the amplitude of the back of the recoil, slow rising edge too allows, but in a state of H level circuit attenuation of relatively high output impedance.In addition, because the level H national exemption is large, the problem of less prominent recoil HCT series equipment, using a schottky diode clamp and a series of resistor termination method combined with improved results will be more obvious.
When a fan signal line, an online splitter in higher bit rate and speed advantage rate, the above described method is often not enough TTL shaping.Because there is a reflection line, they tend to be synthesized at high rates, resulting in severe signal distortion and reduced interference.Therefore, in order to solve the problem of reflection, the emitter coupled logic system, another method commonly used: line impedance matching method.In this way, the control can reflect the signal integrity assurance.
Strictly speaking, the on-line splitter has a slow speed, traditional TTL edge and CMOS equipment, transmission lines are not very necessary.With a faster edge speed high-speed emitter coupled logic device, transmission lines are not always needed.However, when using transmission lines, they must predict the advantages and oscillations reflected in connection delays and control impedance.
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