L-band SiGe HBT active differential equalizers with variable, positive or negative gain slopes have been designed and fabricated for frequency and temperature compensation of microwave and optical systems. The active equalizer employs varactor-tuned base bias circuits for variable and positive gain slopes or varactor-tuned collector bias circuits for variable and negative gain slopes. The implemented active equalizers have achieved positive gain slopes of +88 to +121dB/GHz across 0.5 to 1GHz as well as negative gain slopes of-17 to-46dB/GHz over 0.1 to 0.8GHz. The active differential equalizers presented in this paper have an outstanding feature of showing abrupt gain slopes with the use of bandstop performances, which can be useful for frequency and temperature compensation with narrowband but abrupt gain slopes.
L-band SiGe HBT active differential equalizers with variable, positive or negative gain slopes have been designed and fabricated for frequency and temperature compensation of microwave and optical systems. The active equalizer employs dual-resonant RLC circuits in the series feedback path of the differential amplifier for positive gain slopes or in the load for negative gain slopes. The implemented active equalizers have achieved positive gain slopes of +54 to +87dB/GHz across 0.2 to 0.6GHz as well as negative gain slopes of-50 to-100dB/GHz over 0.6 to 1.2GHz. The active differential equalizers presented in this paper have an outstanding feature of providing variable, positive or negative gain slopes, which can be easily adjusted to meet with various stringent requirements for frequency and temperature compensation in microwave and optical systems.
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