Reconfigurable Low-IF Mixer and Tunable Filter for SDR System
- Title
- Reconfigurable Low-IF Mixer and Tunable Filter for SDR System
- Author
- 김정표
- Alternative Author(s)
- Kim, Jeong-Pyo
- Advisor(s)
- 최재훈
- Issue Date
- 2007-08
- Publisher
- 한양대학교
- Degree
- Doctor
- Abstract
- In the recent, the wireless communication service, such as GSM, IS-95, W-CDMA, GPS, Bluetooth, and WLAN, is developed rapidly and the number of wireless standards is increasing for every year. In order to build such a multi-standard adaptive transceiver, various solutions with single signal path and multi signal path exist. Most existing multi-standard wireless devices use separate signal paths for different standards. However, these methods increase the cost, power consumption and size of the RF module. Clearly, a single path that can operate at two or more frequency bands would be preferable.
In this dissertation, a reconfigurable low-IF mixer and a tunable band pass filter for the SDR system is proposed. The operating frequency band of the proposed components is continuously selected by controlling the DC bias voltage of the varactor-tuned diodes. Thus, if the components have a single signal path and a large tuning range with flatness of the characteristics, those can be easily applied to a multi-band system for the SDR system.
The proposed reconfigurable mixer is operated between 850 MHz ~ 2 GHz, which includes all commercial mobile communication service. Because the varactor diodes are used to adjust the impedance characteristic of the selected frequency band; to select a specific frequency; and are simultaneously controlled in RF/LO ports, similar performance across the tuning range is maintained. In addition, since the mixer has a single signal path for the multi-band signals and a wide band tuning range, the designed reconfigurable mixer is applicable for the SDR system.
A tunable filter with a hairpin line resonator and a loading capacitor is designed. The filter is modified by adding other varactor diodes to the coupling part for loss compensation. Therefore, the filter can be achieved a simple structure and characteristics that include a wide band tuning range of 76.5 % from 458 MHz to 1026 MHz and a low insertion loss of less than 4.42 dB.
Since the designed mixer and the tunable filter have a very simple structure as well as good performance, they are suitable in the SDR system.
- URI
- https://repository.hanyang.ac.kr/handle/20.500.11754/148493http://hanyang.dcollection.net/common/orgView/200000406956
- Appears in Collections:
- GRADUATE SCHOOL[S](대학원) > DEPARTMENT OF ELECTRICAL & COMPUTER ENGINEERING(전자통신전파공학과) > Theses (Ph.D.)
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