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Twisted-pair driver with staggered differential drivers and glitch free binary to multi level transmit encoder
Twisted-pair driver with staggered differential drivers and glitch free binary to multi level transmit encoder
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机译:双绞线驱动器,具有交错式差分驱动器和无干扰的二进制至多级发射编码器
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摘要
A twisted-pair current driver is implemented in CMOS. EMI from sharp changes in the current driven is reduced by gradually changing the current driven when the inputs change. The current driver is divided into N differential drivers, each driving one-Nth of the total switching current to the twisted pair. Delay lines delay when input changes are sent to each of the four differential drivers, staggering their response. Either binary or multi-level-transition (MLT-3) data can be transmitted. A binary-to-MLT converter uses a dummy flip-flop to match delays and eliminate encoding glitches. Either the binary or the MLT-3 encoded data is coupled to the inputs of the delay lines and the differential drivers. The mid-level for MLT-3 is driven when both the inputs are high, causing the differential drivers to split the current among the two differential outputs to the twisted pair. The amount of current switched by each differential driver is doubled for multi-level mode to allow receivers to observe the smaller, multiple steps.
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