L-band SiGe HBT active differential equalizers with variable inclination and position of the positive or negative gain slopes

L-band SiGe HBT active differential equalizers with variable inclination and position of the 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 −55 to −95dB/GHz over 1.1 to 1.5GHz. The active differential equalizers presented in this paper have an outstanding feature of providing variable inclination and position of the 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.

[1]  S. C. Bera.  Amplitude Tilt Active Equalizer for Frequency and Temperature Compensation , 2011, IEEE Microwave and Wireless Components Letters.

[2]  Bo Yan,et al.  A BROADBAND MICROWAVE GAIN EQUALIZER , 2012 .

[3]  J.A. Walker,et al.  Micromechanical gain slope compensator for spectrally linear optical power equalization , 2000, IEEE Photonics Technology Letters.

[4]  Yasushi Itoh,et al.  L-Band SiGe HBT Differential Variable Gain Amplifiers Using Capacitance-Variable/Selectable Bridged-T Attenuators , 2012 .

[5]  H.J. Sun,et al.  A DC-18 GHz GaAs MESFET monolithic variable slope gain-equalizer IC , 1989, Digest of Papers.,Microwave and Millimeter-Wave Monolithic Circuits Symposium.

[6]  M. Morgan,et al.  Non-Reflective Transmission-Line Filters for Gain Slope Equalization , 2007, 2007 IEEE/MTT-S International Microwave Symposium.