Analysis and Design of a Chip Filter With Low Insertion Loss and Two Adjustable Transmission Zeros Using 0.18- $\mu{\hbox{m}}$ CMOS Technology

This paper presents the structure of a high-selectivity bandpass filter that is fabricated on low-resistivity silicon substrate with a commercial CMOS technology. The filter is constructed using crossed coplanar waveguide (CPW) lines and metal-insulator-metal capacitors to ensure that it has the desired passband characteristics. An adjustable capacitor between the input and output ports is employed to form a capacitive cross-coupled path, yielding two transmission zeros in the lower and upper stopbands, respectively. Additionally, the coupling mechanism can be modified by turning on or off the gate of an nMOS transistor to adjust the positions of the transmission zeros by applying an externally controlled voltage. To obtain a low passband loss and to minimize the chip size, high-impedance CPW transmission lines are adopted. Our analysis indicates that the CPW line possesses more advantages than the preferred stacked-ground CPW line for constructing the proposed filter. A very compact X -band experimental prototype with a size of 0.88 × 0.54 mm2 was designed and fabricated. The measurements reveal an insertion loss of less than 3.2 dB in the passband, which is from 10.6 to 12.7 GHz, and rejection levels greater than 35 dB at the designed frequencies of transmission zeros. Moreover, the lower and upper transmission zeros can be shifted from 5 to 6.5 GHz and from 18 to 21.4 GHz, respectively, by changing the controlled voltage.

[1]  Cheng-Ying Hsu,et al.  Design of 60-GHz millimeter-wave CMOS RFIC-on-Chip bandpass filter , 2007, 2007 European Microwave Conference.

[2]  Yong-Zhong Xiong,et al.  Design of 60- and 77-GHz Narrow-Bandpass Filters in CMOS Technology , 2008, IEEE Transactions on Circuits and Systems II: Express Briefs.

[3]  S. Amari,et al.  Direct synthesis of folded symmetric resonator filters with source-load coupling , 2001, IEEE Microwave and Wireless Components Letters.

[4]  Kwok-Keung M. Cheng.  Design of dual-mode ring resonators with transmission zeros , 1997 .

[5]  R.W. Brodersen,et al.  Millimeter-wave CMOS design , 2005, IEEE Journal of Solid-State Circuits.

[6]  Byunghoo Jung,et al.  Novel CMOS low-loss transmission line structure , 2004, Proceedings. 2004 IEEE Radio and Wireless Conference (IEEE Cat. No.04TH8746).

[7]  Yong-Zhong Xiong,et al.  CMOS bandpass filters for 77 GHz automotive radar systems , 2008 .

[8]  Cheng-Ying Hsu,et al.  70 GHz Folded Loop Dual-Mode Bandpass Filter Fabricated Using 0.18 $\mu$ m Standard CMOS Technology , 2008, IEEE Microwave and Wireless Components Letters.

[9]  K. Soumyanath,et al.  A 64 GHz LNA With 15.5 dB Gain and 6.5 dB NF in 90 nm CMOS , 2008, IEEE Journal of Solid-State Circuits.

[10]  Ikuo Awai,et al.  Control of attenuation pole frequency of a dual-mode microstrip ring resonator bandpass filter , 2001 .

[11]  Ke-Li Wu,et al.  A compact second-order LTCC bandpass filter with two finite transmission zeros , 2003 .

[12]  Shyh-Jong Chung,et al.  Bandpass filter of serial configuration with two finite transmission zeros using LTCC technology , 2005 .

[13]  Yi-Chyun Chiang,et al.  A Method of Synthesizing Microwave Bandpass Filters Constructed With Symmetrical or Asymmetrical Compact Microstrip Resonators , 2006, IEEE Transactions on Microwave Theory and Techniques.

[14]  Yi-Chyun Chiang,et al.  Design of a Ka-band bandpass filter with asymmetrical compact resonator , 2009, 2009 IEEE MTT-S International Microwave Symposium Digest.

[15]  C. Nguyen.  Analysis Methods for RF, Microwave, and Millimeter-Wave Planar Transmission Line Structures , 2000 .

[16]  Koen Mouthaan,et al.  40 GHz compact TFMS meander-line bandpass filter on silicon substrate , 2007 .

[17]  M. K. Mohd Salleh,et al.  Quarter-Wavelength Side-Coupled Ring Resonator for Bandpass Filters , 2008, IEEE Transactions on Microwave Theory and Techniques.

[18]  Jia-Sheng Hong,et al.  Microstrip filters for RF/microwave applications , 2001 .

[19]  Lei Zhu,et al.  Millimeter-Wave Bandpass Filters by Standard 0.18-$\mu\hbox{m}$ CMOS Technology , 2007, IEEE Electron Device Letters.

[20]  Mitsuo Makimoto,et al.  Stripline dual-mode ring resonators and their application to microwave devices , 1996 .

[21]  Chi-Yang Chang,et al.  Realization of transmission zeros in combline filters using an auxiliary inductively coupled ground plane , 2003 .

[22]  H. Chiu,et al.  Implementation of Second-order Ku-band Chip Filter on Si Substrate with Commercial 0.18μm CMOS Technology , 2006, 2006 IEEE MTT-S International Microwave Symposium Digest.

[23]  Y. Horii.  A novel microstrip bandpass filter having plural transmission zeros using a capacitive-inductive-capacitive configuration , 2004, 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535).

[24]  Chun-Lin Ko,et al.  On-Chip Transmission Line Modeling and Applications to Millimeter-Wave Circuit Design in 0.13um CMOS Technology , 2007, 2007 International Symposium on VLSI Design, Automation and Test (VLSI-DAT).