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An L-band SiGe HBT active differential equalizer with variable positive/negative gain slopes using parallel RC circuits

An L-band SiGe HBT active differential equalizer with variable positive/negative gain slopes has been designed, fabricated and performed. The active equalizer employs parallel RC circuits in the feedback and load circuits of the differential amplifier to achieve positive/negative gain slopes simultaneously. The implemented active equalizer has achieved positive gain slopes of 0 to +18dB/GHz as well as negative gain slopes of −13 to 0dB/GHz across 0.1 to 1GHz. The active differential equalizer presented in this paper has an outstanding feature of providing both positive and negative gain slopes coincidently from a single circuit, which can be easily employed in the microwave and optical systems with various requirements for frequency and temperature compensations.