A Cross-Coupled LPF Topology and Design for Millimeter-Wave RFIC Applications

A low-pass filter (LPF) with ultrawide rejection band and compact size by using a cross-coupled topology is proposed. The operating mechanism of the cross-coupled LPF from a unit cell to multiple cells is investigated by using the proposed circuit model. The topology and the circuit model are adopted to design the on-chip LPFs through parameter extracting and electromagnetic optimization. One of the designed cross-coupled LPFs with 1-dB cutoff frequency fc of 2.2 GHz demonstrates the stopband rejection of 30 dB up to 20 fc, i.e., 45 GHz, and the rejection of 20 dB up to 52 fc, i.e., 110 GHz. The measured passband insertion loss is less than 2.2 dB. The size of the LPF is only 350 μm by 280 μm or 0.0089 λg ×0.0071 λg (λg is the guide wavelength on silicon at cutoff frequency).

[1]  Wen-Hua Tu,et al.  Compact microstrip low-pass filter with sharp rejection , 2005, IEEE Microwave and Wireless Components Letters.

[2]  Zhengwei Du,et al.  Influence of a metallic enclosure on the S-parameters of microstrip photonic bandgap structures , 2002 .

[3]  Changjun Liu,et al.  A Novel Low-Pass Filter With an Embedded Band-Stop Structure for Improved Stop-Band Characteristics , 2009, IEEE Microwave and Wireless Components Letters.

[4]  Kai Chang,et al.  Low-Pass Filter Design Through the Accurate Analysis of Electromagnetic-Bandgap Geometry on the Ground Plane , 2009, IEEE Transactions on Microwave Theory and Techniques.

[5]  Kaixue Ma,et al.  Compact two-order bandpass filter with three finite zero points , 2005 .

[6]  Kai Kang,et al.  Coupling Effects Between On-Chip Inductors in the Millimeter-Wave Regime , 2010, IEEE Electron Device Letters.

[7]  G. Jue,et al.  Improved planar spiral transformer theory applied to a miniature lumped element quadrature hybrid , 1997 .

[8]  Kaixue Ma,et al.  Experimentally investigating slow-wave transmission lines and filters based on conductor-backed CPW periodic cells , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..

[9]  Shaoqiu Xiao,et al.  Characterizing and Modeling Conductor-backed CPW Periodic Band Stop Filter with Miniaturized Size , 2007, 2007 IEEE/MTT-S International Microwave Symposium.

[10]  R.P. Martins,et al.  Miniaturized microstrip lowpass filter with wide stopband using double equilateral U-shaped defected ground structure , 2006, IEEE Microwave and Wireless Components Letters.

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

[12]  Kaixue Ma,et al.  Novel low cost compact size planar low pass filters with deep skirt selectivity and wide stopband rejection , 2010, 2010 IEEE MTT-S International Microwave Symposium.

[13]  Lei Zhu,et al.  Stopband-Expanded Low-Pass Filters Using Microstrip Coupled-Line Hairpin Units , 2008, IEEE Microwave and Wireless Components Letters.

[14]  B. Razavi,et al.  A New Transceiver Architecture for the 60-GHz Band , 2009, IEEE Journal of Solid-State Circuits.

[15]  Kaixue Ma,et al.  800MHz∼2.5GHz miniaturized multi-layer symmetrical stacked baluns for silicon based RF ICs , 2005, IMS 2005.

[16]  Ronghong Jin,et al.  Ultra-wideband bandpass filter with hybrid quasi-lumped elements and defected ground structure , 2007 .

[17]  Kaixue Ma,et al.  New Ultra-Wide Stopband Low-Pass Filter Using Transformed Radial Stubs , 2011, IEEE Transactions on Microwave Theory and Techniques.

[18]  J. Sheen,et al.  A compact semi-lumped low-pass filter for harmonics and spurious suppression , 2000 .

[19]  A. Chu,et al.  Dual Function Mixer Circuit for Millimeter Wave Transceiver Applications , 1985, 1985 IEEE MTT-S International Microwave Symposium Digest.

[20]  Mohsen Hayati,et al.  Elliptic-function lowpass filter with sharp cutoff frequency using slit-loaded tapered compact microstrip resonator cell , 2010 .

[21]  Dong Il Kim,et al.  Compact Structure With Three Attenuation Poles for Improving Stopband Characteristics , 2006, IEEE Microwave and Wireless Components Letters.

[22]  Behzad Razavi,et al.  Stacked inductors and transformers in CMOS technology , 2001 .

[23]  Lin Li,et al.  Compact Lowpass Filters With Sharp and Expanded Stopband Using Stepped Impedance Hairpin Units , 2010, IEEE Microwave and Wireless Components Letters.