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We present a pseudo random bit sequence (PRBS) generator with a sequence length of 27-1. The circuit uses a 7 bit full rate shift register with a linear XOR feedback and works up to data rates of 13 Gb/s. The PRBS generator features a divide by 2 trigger divider, two 3 bit shifted outputs and an autostart logic. The circuit draws 137 mA from a single 1.5 V supply. The circuit is manufactured in 120 nm bulk CMOS technology.