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Papers by Yi-Chyun Chiang

Research paper thumbnail of Design of a wide-band lumped-element 3dB quadrature coupler

IEEE Transactions on Microwave Theory and Techniques, 2001

Analysis and design techniques for designing a lumped-element 3-dB quadrature coupler with wide-b... more Analysis and design techniques for designing a lumped-element 3-dB quadrature coupler with wide-band flat coupling are proposed for microwave integrated-circuit/monolithic-microwave integrated-circuit applications. The proposed design technique can produce a coupler with flat coupling over 50% fractional bandwidth, which is wider than the conventional lumped-element design methods. A prototype consisting of a capacitive coupled high-pass network is designed and fabricated to

Research paper thumbnail of A new compact LTCC bandpass filter using negative coupling

IEEE Microwave and Wireless Components Letters, 2005

... 641 A New Compact LTCC Bandpass Filter Using ... The measured result agrees very well with th... more ... 641 A New Compact LTCC Bandpass Filter Using ... The measured result agrees very well with the electromagnetic (EM) designed response. Index Terms—Bandpass filter (BPF), filters, low-temperature co-fired ceramic (LTCC), lumped element microwave circuits. ...

Research paper thumbnail of Transdirectional Coupled-Line Couplers Implemented by Periodical Shunt Capacitors

IEEE Transactions on Microwave Theory and Techniques, 2009

Research paper thumbnail of A CMOS Colpitts voltage controlled oscillator with an enhanced transconductance method

Microwave and Optical Technology Letters, 2008

This work presents a technique to enhance the performance of the conventional PMOS Colpitts VCO c... more This work presents a technique to enhance the performance of the conventional PMOS Colpitts VCO circuit. This technique is accomplished by adding an NMOS cross-coupled pair under the traditional differential Colpitts VCO to enhance the oscillator startup condition. The signal analysis also supports this viewpoint and presents a device-choosing method to optimize the output power and phase noise. In realization, the circuit in the CMOS 0.18-μm technology, a U-shaped inductor, and thick oxide varactors are adopted in circuit to increase the quality factor of resonant tank. The performance of VCO demonstrates a center frequency of 16.7 GHz, a FOM of −186.2 dBc/Hz, and the phase noise of −110.42 dBc/Hz at the 1 MHz offset from the oscillation frequency. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3160–3164, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23944

Research paper thumbnail of Closed-Form Equations of Conventional Microstrip Couplers Applied to Design Couplers and Filters Constructed With Floating-Plate Overlay

IEEE Transactions on Microwave Theory and Techniques, 2008

Research paper thumbnail of Design of microwave wide-band quadrature hybrid using planar transformer coupling method

IEEE Transactions on Microwave Theory and Techniques, 2003

A lumped-element quadrature hybrid consisting of two-section inductive coupled π-networks is pres... more A lumped-element quadrature hybrid consisting of two-section inductive coupled π-networks is presented. A synthesizing method involving a new set of design equations are also developed to realize the proposed hybrid with very good balance in both magnitude and phase between the output ports over a 38% fractional bandwidth. The measurements of the two prototypes show quite good agreement with the

Research paper thumbnail of Design of a New Type Planar Balun by Using Trans-Directional Couplers

IEEE Transactions on Microwave Theory and Techniques, 2012

This paper presents a new type of planar balun implemented by trans-directional (TRD) couplers. T... more This paper presents a new type of planar balun implemented by trans-directional (TRD) couplers. The formulation of the proposed balun is derived and the characteristics of the balun are analyzed. This balun requires no via-hole connection to ground. Thus, the phase errors caused by the inductive effect of via-holes are reduced. The configuration of TRD couplers also helps to reduce the complexity of dc biasing of active circuits in the next stage. Two prototypes are designed and built to verify the design concept. The first one, operated from 1.94 to 2.69 GHz, is realized by 3-dB TRD couplers. The second prototype, which is operated from 376 to 458 MHz, is constructed by two 4.8-dB TRD couplers. The dimension of this prototype is only 16.8 mm × 39.4 mm. This small area is achieved by meandering the coupled-line sections because its coupling effect is purely contributed by periodical shunt capacitors on the microstrip lines. Measured results are in good agreement with simulated results.

Research paper thumbnail of Design of Second Order BandPass Filter with Inductive pi-Network Coupling

Ieice Transactions, 2005

ABSTRACT

Research paper thumbnail of Microstrip Open-Loop Resonator With Multispurious Suppression

IEEE Microwave and Wireless Components Letters, 2007

ABSTRACT

Research paper thumbnail of Parallel Coupled-Line Bandpass Filters With Floating Plate Overlay for Enhanced Coupling and Spurious Suppression

A new type of parallel-coupled microstrip filter is proposed to have wide-band performance and su... more A new type of parallel-coupled microstrip filter is proposed to have wide-band performance and suppress the second harmonic response. The proposed filters are constructed with using floating plate overlays to enhance the coupling between microstrip lines, and compensate the difference in phase velocity under even- and odd-mode excitations. The synthesis method is well developed and the design curves are given. Two Chebyshev filters with fractional bandwidths of 50% and 70%, respectively, were fabricated and measured to validate the design concept. All the measured results agree well with the simulation.

Research paper thumbnail of UWB LNA and mixer with an active balun in 0.18μm CMOS process

Research paper thumbnail of Low Power and High Efficiency VCO and Quadrature VCO Circuits Constructed with Transconductance-Enhanced Colpitts Oscillator Feature

Research paper thumbnail of Compact parallel coupled-line bandpass filter with wide bandwidth and suppression of spurious

Microwave and Optical Technology Letters, 2009

The re-entrant coupling structure is applied in a parallel-coupled microstrip filter design to en... more The re-entrant coupling structure is applied in a parallel-coupled microstrip filter design to ensure a wide bandwidth, compactness, and the suppression of spurious. Fan design graphs are provided to determine the dimensions of each coupled stage. The features and advantages of the proposed circuit are analyzed in detail. Two experimental filters with design bandwidths of 70 and 90% are fabricated to verify the effectiveness of the modified structure. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1795–1800, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24513

Research paper thumbnail of A Miniaturized Microstrip Balun Constructed With Two Coupled Lines and a Redundant Line

IEEE Microwave and Wireless Components Letters, 2010

Research paper thumbnail of DESIGN OF CMOS QUADRATURE VCO USING ON-CHIP TRANS-DIRECTIONAL COUPLERS

Progress in Electromagnetics Research-pier, 2010

Research paper thumbnail of High breakdown voltage (Al/sub 0.3/Ga/sub 0.7/)/sub 0.5/In/sub 0.5/P/InGaAs quasi-enhancement-mode pHEMT with field-plate technology

IEEE Electron Device Letters, 2005

ABSTRACT

Research paper thumbnail of Low Phase-Noise and Low-Power CMOS VCO Constructed in Current-Reused Configuration

IEEE Microwave and Wireless Components Letters, 2008

Research paper thumbnail of A Method of Synthesizing Microwave Bandpass Filters Constructed With Symmetrical or Asymmetrical Compact Microstrip Resonators

IEEE Transactions on Microwave Theory and Techniques, 2006

... 2004. [2] JT Lu, ST Chen, and M. Jiang, “Parallel-coupled microstrip filters with over-couple... more ... 2004. [2] JT Lu, ST Chen, and M. Jiang, “Parallel-coupled microstrip filters with over-coupled end stages for suppression of spurious responses,” IEEE Microw. Wireless Compon. Lett., vol. 13, no. ... New York: Wiley, 2001, ch. 8, pp. 247–249. [11] C.-H. Lee, A. Sutono, S. Han, K ...

Research paper thumbnail of Low Phase Noise and High Conversion Gain Oscillator Mixer Constructed with a 0.18-μm CMOS Technology

International Journal of Microwave Science and Technology, 2009

Research paper thumbnail of Design of a K-Band Chip Filter With Three Tunable Transmission Zeros Using a Standard 0.13- CMOS Technology

IEEE Transactions on Circuits and Systems Ii-express Briefs, 2010

ABSTRACT A novel bandpass filter (BPF), which is fabricated with a commercial CMOS process, demon... more ABSTRACT A novel bandpass filter (BPF), which is fabricated with a commercial CMOS process, demonstrating a low insertion loss in the passband and multiple transmission zeros in stopbands, is presented for 24-GHz automotive ultrawideband (UWB) radar systems. The filter combines a second-order asymmetrically compact resonator filter with a source-load coupling mechanism to realize three transmission zeros; two zeros are arranged in the lower stopband, and one zero is located in the upper stopband. To achieve a compact layout size and a low insertion loss, a semilumped approach, which is accomplished with mixed utilization of high-impedance coplanar waveguide lines and lumped capacitors, is used to construct the chip filter. A K-band experimental prototype that has a very compact size of 0.35 × 0.8 mm2 was realized. The average insertion loss in the filter's passband is about 2.7 dB, the return loss is greater than 15 dB within the frequencies of 24-27.5 GHz, and the attenuation levels at the three transmission zeros all greater than 35 dB.

Research paper thumbnail of Design of a wide-band lumped-element 3dB quadrature coupler

IEEE Transactions on Microwave Theory and Techniques, 2001

Analysis and design techniques for designing a lumped-element 3-dB quadrature coupler with wide-b... more Analysis and design techniques for designing a lumped-element 3-dB quadrature coupler with wide-band flat coupling are proposed for microwave integrated-circuit/monolithic-microwave integrated-circuit applications. The proposed design technique can produce a coupler with flat coupling over 50% fractional bandwidth, which is wider than the conventional lumped-element design methods. A prototype consisting of a capacitive coupled high-pass network is designed and fabricated to

Research paper thumbnail of A new compact LTCC bandpass filter using negative coupling

IEEE Microwave and Wireless Components Letters, 2005

... 641 A New Compact LTCC Bandpass Filter Using ... The measured result agrees very well with th... more ... 641 A New Compact LTCC Bandpass Filter Using ... The measured result agrees very well with the electromagnetic (EM) designed response. Index Terms—Bandpass filter (BPF), filters, low-temperature co-fired ceramic (LTCC), lumped element microwave circuits. ...

Research paper thumbnail of Transdirectional Coupled-Line Couplers Implemented by Periodical Shunt Capacitors

IEEE Transactions on Microwave Theory and Techniques, 2009

Research paper thumbnail of A CMOS Colpitts voltage controlled oscillator with an enhanced transconductance method

Microwave and Optical Technology Letters, 2008

This work presents a technique to enhance the performance of the conventional PMOS Colpitts VCO c... more This work presents a technique to enhance the performance of the conventional PMOS Colpitts VCO circuit. This technique is accomplished by adding an NMOS cross-coupled pair under the traditional differential Colpitts VCO to enhance the oscillator startup condition. The signal analysis also supports this viewpoint and presents a device-choosing method to optimize the output power and phase noise. In realization, the circuit in the CMOS 0.18-μm technology, a U-shaped inductor, and thick oxide varactors are adopted in circuit to increase the quality factor of resonant tank. The performance of VCO demonstrates a center frequency of 16.7 GHz, a FOM of −186.2 dBc/Hz, and the phase noise of −110.42 dBc/Hz at the 1 MHz offset from the oscillation frequency. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3160–3164, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23944

Research paper thumbnail of Closed-Form Equations of Conventional Microstrip Couplers Applied to Design Couplers and Filters Constructed With Floating-Plate Overlay

IEEE Transactions on Microwave Theory and Techniques, 2008

Research paper thumbnail of Design of microwave wide-band quadrature hybrid using planar transformer coupling method

IEEE Transactions on Microwave Theory and Techniques, 2003

A lumped-element quadrature hybrid consisting of two-section inductive coupled π-networks is pres... more A lumped-element quadrature hybrid consisting of two-section inductive coupled π-networks is presented. A synthesizing method involving a new set of design equations are also developed to realize the proposed hybrid with very good balance in both magnitude and phase between the output ports over a 38% fractional bandwidth. The measurements of the two prototypes show quite good agreement with the

Research paper thumbnail of Design of a New Type Planar Balun by Using Trans-Directional Couplers

IEEE Transactions on Microwave Theory and Techniques, 2012

This paper presents a new type of planar balun implemented by trans-directional (TRD) couplers. T... more This paper presents a new type of planar balun implemented by trans-directional (TRD) couplers. The formulation of the proposed balun is derived and the characteristics of the balun are analyzed. This balun requires no via-hole connection to ground. Thus, the phase errors caused by the inductive effect of via-holes are reduced. The configuration of TRD couplers also helps to reduce the complexity of dc biasing of active circuits in the next stage. Two prototypes are designed and built to verify the design concept. The first one, operated from 1.94 to 2.69 GHz, is realized by 3-dB TRD couplers. The second prototype, which is operated from 376 to 458 MHz, is constructed by two 4.8-dB TRD couplers. The dimension of this prototype is only 16.8 mm × 39.4 mm. This small area is achieved by meandering the coupled-line sections because its coupling effect is purely contributed by periodical shunt capacitors on the microstrip lines. Measured results are in good agreement with simulated results.

Research paper thumbnail of Design of Second Order BandPass Filter with Inductive pi-Network Coupling

Ieice Transactions, 2005

ABSTRACT

Research paper thumbnail of Microstrip Open-Loop Resonator With Multispurious Suppression

IEEE Microwave and Wireless Components Letters, 2007

ABSTRACT

Research paper thumbnail of Parallel Coupled-Line Bandpass Filters With Floating Plate Overlay for Enhanced Coupling and Spurious Suppression

A new type of parallel-coupled microstrip filter is proposed to have wide-band performance and su... more A new type of parallel-coupled microstrip filter is proposed to have wide-band performance and suppress the second harmonic response. The proposed filters are constructed with using floating plate overlays to enhance the coupling between microstrip lines, and compensate the difference in phase velocity under even- and odd-mode excitations. The synthesis method is well developed and the design curves are given. Two Chebyshev filters with fractional bandwidths of 50% and 70%, respectively, were fabricated and measured to validate the design concept. All the measured results agree well with the simulation.

Research paper thumbnail of UWB LNA and mixer with an active balun in 0.18μm CMOS process

Research paper thumbnail of Low Power and High Efficiency VCO and Quadrature VCO Circuits Constructed with Transconductance-Enhanced Colpitts Oscillator Feature

Research paper thumbnail of Compact parallel coupled-line bandpass filter with wide bandwidth and suppression of spurious

Microwave and Optical Technology Letters, 2009

The re-entrant coupling structure is applied in a parallel-coupled microstrip filter design to en... more The re-entrant coupling structure is applied in a parallel-coupled microstrip filter design to ensure a wide bandwidth, compactness, and the suppression of spurious. Fan design graphs are provided to determine the dimensions of each coupled stage. The features and advantages of the proposed circuit are analyzed in detail. Two experimental filters with design bandwidths of 70 and 90% are fabricated to verify the effectiveness of the modified structure. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1795–1800, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24513

Research paper thumbnail of A Miniaturized Microstrip Balun Constructed With Two Coupled Lines and a Redundant Line

IEEE Microwave and Wireless Components Letters, 2010

Research paper thumbnail of DESIGN OF CMOS QUADRATURE VCO USING ON-CHIP TRANS-DIRECTIONAL COUPLERS

Progress in Electromagnetics Research-pier, 2010

Research paper thumbnail of High breakdown voltage (Al/sub 0.3/Ga/sub 0.7/)/sub 0.5/In/sub 0.5/P/InGaAs quasi-enhancement-mode pHEMT with field-plate technology

IEEE Electron Device Letters, 2005

ABSTRACT

Research paper thumbnail of Low Phase-Noise and Low-Power CMOS VCO Constructed in Current-Reused Configuration

IEEE Microwave and Wireless Components Letters, 2008

Research paper thumbnail of A Method of Synthesizing Microwave Bandpass Filters Constructed With Symmetrical or Asymmetrical Compact Microstrip Resonators

IEEE Transactions on Microwave Theory and Techniques, 2006

... 2004. [2] JT Lu, ST Chen, and M. Jiang, “Parallel-coupled microstrip filters with over-couple... more ... 2004. [2] JT Lu, ST Chen, and M. Jiang, “Parallel-coupled microstrip filters with over-coupled end stages for suppression of spurious responses,” IEEE Microw. Wireless Compon. Lett., vol. 13, no. ... New York: Wiley, 2001, ch. 8, pp. 247–249. [11] C.-H. Lee, A. Sutono, S. Han, K ...

Research paper thumbnail of Low Phase Noise and High Conversion Gain Oscillator Mixer Constructed with a 0.18-μm CMOS Technology

International Journal of Microwave Science and Technology, 2009

Research paper thumbnail of Design of a K-Band Chip Filter With Three Tunable Transmission Zeros Using a Standard 0.13- CMOS Technology

IEEE Transactions on Circuits and Systems Ii-express Briefs, 2010

ABSTRACT A novel bandpass filter (BPF), which is fabricated with a commercial CMOS process, demon... more ABSTRACT A novel bandpass filter (BPF), which is fabricated with a commercial CMOS process, demonstrating a low insertion loss in the passband and multiple transmission zeros in stopbands, is presented for 24-GHz automotive ultrawideband (UWB) radar systems. The filter combines a second-order asymmetrically compact resonator filter with a source-load coupling mechanism to realize three transmission zeros; two zeros are arranged in the lower stopband, and one zero is located in the upper stopband. To achieve a compact layout size and a low insertion loss, a semilumped approach, which is accomplished with mixed utilization of high-impedance coplanar waveguide lines and lumped capacitors, is used to construct the chip filter. A K-band experimental prototype that has a very compact size of 0.35 × 0.8 mm2 was realized. The average insertion loss in the filter's passband is about 2.7 dB, the return loss is greater than 15 dB within the frequencies of 24-27.5 GHz, and the attenuation levels at the three transmission zeros all greater than 35 dB.