An L-Band SiGe HBT Active Differential Equalizer with Tunable Positive/Negative Gain Slopes Using Transistor-Loaded RC-Circuits

摘要

An L-band SiGe HBT active differential equalizer with tunable positiveegative gain slopes has been realized. the active equalizer employs transistor-loaded parallel RC circuits in the load and feedback paths of the differential amplifier in order to achieve tunable positiveegative gain slopes simultaneously. The implemented active equalizer has achieved positive gain slopes up to + 13.2dB/GHz and negative gain slopes down to - 6.7dB/GHz across 0.1 to 0.8GHz. The active differential equalizer provides positive and negative gain slopes coincidently by making a gain variation larger at lower frequencies and smaller at higher frequencies to compensate for various types of the frequency-and temperature-dependent gain slopes.