L-Band SiGe HBT dual-band differential amplifiers having frequency-tunable bandpass or bandstop responses using novel varactor-loaded dual-band resonators

2016 ◽  
Vol 9 ◽  
pp. 713-725
Author(s):  
Yasushi Itoh ◽  
Hiroaki Takagi
2012 ◽  
Vol 2012 ◽  
pp. 1-7
Author(s):  
Kazuyoshi Sakamoto ◽  
Yasushi Itoh

A dual-band SiGe HBT frequency-tunable and phase-shifting differential amplifier has been developed for the future active phased array antennas with a multiband, multibeam, and multitarget tracking operation. The amplifier uses varactor-loaded, stacked LC resonators in the design of the output circuit in order to provide frequency-tunable and phase-shifting capabilities for dual frequencies. By utilizing the varactor-loaded LC resonator, which has a variable resonant frequency and a large insertion phase variation, frequency-tunable and phase-shifting performances become available. Moreover, by using the stacked configuration, the frequency and insertion phase can be varied independently for dual frequencies. A dual-band SiGe HBT differential amplifier has achieved a lower-frequency tuning range of 0.56 to 0.7 GHz for a higher fixed frequency of 0.97 GHz as well as a higher-frequency tuning range of 0.92 to 1.01 GHz for a lower fixed frequency of 0.63 GHz. A lower-frequency phase variation of 99° and a higher-frequency phase variation of 90.3° have been accomplished at 0.63 and 0.97 GHz, respectively. This is the first report on the dual-band differential amplifier with frequency-tunable and phase-shifting capabilities.


Author(s):  
Hong-yun Xie ◽  
Zhi-yi Lu ◽  
Wan-rong Zhang ◽  
Pei Shen ◽  
Chun-bao Ding ◽  
...  

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