This letter presents a broadband 2:1 static ECL frequency divider in a 0.8 µm InP DHBT process. The proposed divider is based on an ECL double emitter-followers structure. The maximum cut-off frequency ( f t ) utilization of the device is improved up to 0.967 through theoretical analysis and calculation. The measurement shows that the divider can operate with input frequency from 1 GHz to 62 GHz in sinusoidal waveform, while the maximum f t of the device is 150 GHz. Bandwidth utilization BW /f t is 0.413, which is an extremely high value for InP devices at the same size.
This letter presents a wideband and high conversion gain mixer based on Gilbert-cell in InP DHBT process. Capacitive degeneration is introduced to increase the bandwidth of the mixer with no voltage drop and few cost of area. Current bleeding technique is employed to improve conversion gain. Utilization of device f t is analyzed to achieve 0.919. The measurement demonstrates a conversion gain of 14.5 dB at 26 GHz with -3 dB bandwidth of 49 GHz. BW/ f t of 0.306 and GBP of 260 GHz are obtained, which are believed to be among the best compared to mixers fabricated with the same size process.
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