Design of Mixers and Frequency Doublers for Microwave and Millimeter-wave Applications
Date Issued
2010
Date
2010
Author(s)
Chen, Jung-Hau
Abstract
This thesis presents a broadband doubly balanced resistive ring mixer with the baluns and two K-band single-ended frequency doublers. The research is focused on the development of a broadband resistive ring mixer in millimeter-wave frequency using CMOS technology, and two K-band frequency doublers with high conversion gain and good isolation.
This thesis consists of three parts. The first part introduced a 15-50 GHz doubly balanced resistive ring mixer using CMOS process. Besides, this is the first doubly balanced resistive ring mixer in millimeter-wave using CMOS technology. Compared with the previously published broadband mixers, this mixer has high linearity and is suitable for the application for the receiver of the broadband systems. In the second part, a K-band CMOS frequency doubler is realized. The circuit schematic is a frequency doubler that is connected to a cascode amplifier with the current-reused topology, and a Chebyshev band-pass filter is used in the output port to be the output matching network and increase the fundamental rejection. This circuit can improve the conversion gain and maintain good fundamental rejection. In addition, the circuit does not need a large input power. Another K-band CMOS frequency doubler is designed and presented in part three. Without using a wide bandwidth balun or a distributed structure, the frequency mixer can achieve wide bandwidth and consume low dc power consumption. To achieve a good conversion gain in full K-band, the tuning mechanism at the input matching network is adopted. Moreover, a tunable reflector is utilized in this circuit to increase the fundamental rejection, thus the fundamental rejection of this circuit achieving above 32.5 dB in the K-band. Furthermore, since only one transistor is used in this frequency doubler, 0 dBm input power is sufficient to drive this frequency doubler, and thus the required dc power consumption of the frequency source in the system can be reduced effectively.
Subjects
mixer
frequency doubler
balun
current-reused
Chebyshev band-pass fitler
reflector
tuning machanism
Type
thesis
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