SWITCHED IOH AND IOL CURRENT SOURCES FOR CMOS LOW-VOLTAGE PECL DRIVER WITH SELF-TIMED PULL-DOWN CURRENT BOOST

摘要

A differential buffer/driver has a switch network that connects an IOH current source to a differential output to be drive high, and connects an IOL current source to the other differential output to be driven low. Each output can be connected to a pull-down boost current sink. A boost pulse momentarily connects a boost current sink to the differential output being driven low. The differential buffer generates a pair of boost pulses to activate the boost current for either differential output. One boost pulse is activated when one differential output is driven low, while the other boost pulse is activated when the other differential output is driven low.