Design and Analysis of Microwave 24-GHz Active Isolator and Active Quasi-circulator
Date Issued
2014
Date
2014
Author(s)
Chang, Jen-Feng
Abstract
In this thesis presents the research of isolators and quasi-circulators.
A new topology using the nonreciprocal common-source amplifier and the directional coupler is proposed to realize an isolator without ferrite. The theory and the design procedures are presented. The performance of this isolator is comparable to those of the ferrite isolators except for the bandwidth. The OP1dB of the insertion loss is high due to the passive nature of the directional coupler, but the reverse isolation deteriorates with the increasing input power. The proposed 24-GHz MMIC isolator is developed in TSMC 180-nm CMOS. Based on the proposed isolators, a quasi-circulator is designed and fabricated. Both of isolator and quasi-circulator have better OP1dB of the insertion loss than reported active isolators and quasi-circulators.
Besides, a 24-GHz active isolator with another canceling mechanism is presented. This design improves the frequency bandwidth, and the linearity of the reverse isolation of the previous isolator. But the insertion loss and the OP1dB of the insertion loss are worse than the previous isolator. Although the OP1dB of the insertion loss is only 4.5 dBm, the OP1dB of the insertion loss is relatively good under 6-mW dc power consumption compared with the regular amplifier.
Subjects
互補式金屬氧化物半導體
方向耦合器
磁性材料
隔離器
半循環器
Type
thesis
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