Design of CMOS Synthetic Transmission-Line-Based X-Band Active Bandstop Filter
Date Issued
2012
Date
2012
Author(s)
Hou, Lung-Yu
Abstract
This dissertation presents the design of transmission-line-based (TL-based) active bandstop filter fabricated in standard 0.13-μm complementary metal-oxide -semiconductor (CMOS) technology. Firstly, the design methods of a third-order active filter are discussed, and following, a dual-mode active filter is proposed.
The third-order active bandstop filter in the first part is synthesized with three single pole rejection elements, which consists of an open-loop resonator and a CMOS cross-coupled pair. The cross-coupled pair is as an active compensation circuit, which both enhances the quality factor of resonator and reduces the resonator size significantly. Synthetic quasi-TEM complementary-conductive-strip transmission-lines (CCS TLs) are used for resonator implementation. A third-order filter design procedure is proposed, which is based on the low-pass prototype filter design. The second part proposes a dual-mode active filter, comprising an E-shaped dual-mode resonator. Utilizing the properties of dual-mode resonator, which can reduce the number of required resonators for a given degree of filter, a compact filter configuration is obtained.
Each of the filters operated on 10 GHz (X-band), and the size of the multi-pole filter is 570 × 660 μm2 while the dual-mode one is 510 × 570 μm2. The properties of the proposed filters will be verified by the simulation and measurement results.
Subjects
CMOS
active filter
Type
thesis
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