Abstract
Monitoring the eye diagram at the output of an embedded analog adaptive equalizer used in a high speed serial link is challenging. Eye measurement using an external oscilloscope is problematic due to the bandwidth of the test setup. In this work, we describe the working principle and design details of a low cost, on-chip monitor circuit that enables the determination of the eye diagram. The eye opening monitor (EOM), implemented in a 65 nm CMOS process, occupies 0.06 mm2 and consumes 5.7 mW from a 1.2 V supply. Measurements demonstrate the efficacy of our techniques.
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