Browsing by Author "Chang, Chi-Yang"

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33 similar to 50GHz CMOS Receiver with Wideband RF, IF and LO Chain
(2017-01-01)
Huang, Ching-Ying
;
Wu, Kung-Long
;
Hu, Robert
;
Chang, Chi-Yang
;
電子工程學系及電子研究所
This manuscript describes the Q-band 90nmCMOS receiver design where the 33 similar to 50GHz RF-LNA, actively-biased double-balanced mixer, 10GHz IF amplifier, wideband frequency tripler and power amplifier in the LO chain are all integrated into one single chip. With overall power consumption of 170mW under 1.2V bias, the measured conversion gain is 15dB, noise figure close to 8dB, inputreferred P1dB around -30dBm, and the LO-IF port isolation is more than 60dB. Therefore, it can be easily driven by an external 11 similar to 16GHz signal source and used in applications such as next-generation broadband mobile communications where several specific Q-band frequency points have been considered. However, contrary to most receiver designs where the optimization is carried out over a relatively narrow bandwidth, here the main challenge lies in how to effectively extend the RF, IF, and LO bandwidth simultaneously without rendering performance deterioration. By possessing such broadband RF, IF, and LO characteristics, this Q-band circuit is also eligible for use in radio-astronomical, atmospheric, and other scientific instrumentations.
A 1.5 to 37 GHz ultra-broadband MMIC Mouw's star mixer
(2005)
Chang, Chi-Yang
;
Liao, Ching-Ku
;
Niu, Dow-Chih
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電信工程研究所
;
Institute of Communications Engineering
A MMIC ultra-broadband star mixer using Mouw's hybrid junction is presented in this paper. The MMIC chip uses 0.15 mu m HEMT process. The chip is measured in three mounting environments, namely, absorber backed, 15 mil Al(2)O(3) substrate plus absorber, and conductor backed and all of them show ultra-broadband performances. The measured results show that the bandwidth is from 1.5 to 37 GHz except a resonant dip near. 23 GHz occurs in conductor backed case.. The IF 3 dB bandwidth is from DC to 2.5 GHz. The chip can be used as either up- or down-converter. Because the spiral layout of the Mouw's hybrid junction shrinks the area significantly, no off chip baluns are required. The chip size is 2 mm by 2 mm.
A 10-110 GHz fundamental/harmonic rat-race mixer
(2007)
Chi, Chun-Hsiang
;
Wu, Chung-Hung
;
Wang, Wei-Ting
;
Lai, Chi-Hau
;
Niu, Dow-Chih
This paper describes a broadband 10-110GHz mm-wave rat-race ring diode mixer. The mixer can be used as a fundamental mixer as well as a harmonic mixer. The finite-ground-width CPW on a 15mil alumina substrate is used to implement the circuit. The mixer is designed to allow DC bias that a local power as low as 0dBm could properly pump the mixer. Two commercial available M/A-Com MA4E2037 GaAs beam-leaded Schottky diodes are used. The measured conversion loss is typically 9dB from 10 to 100GRz in the fundamental mixing mode and 15dB from 20 to 110GRz in the harmonic mixing mode.
A 34-42GHz Single-Side-Band Transmitter with Switchable VCO/PLL in 90nm-CMOS Process
(2017-01-01)
Huang, Ching-Ying
;
Wu, Kun-Long
;
Hu, Robert
;
Chang, Chi-Yang
;
電子工程學系及電子研究所
This manuscript describes a 34-42GHz single-sideband 90nm-CMOS transmitter where PLL has been integrated into the LO chain and, with I/Q input and two-stage up-conversion, a 30dB image-rejection ratio is achieved within the intended bandwidth. This transmitter's wideband tuning range is made possible by the use of additional capacitor on the VCO, and the phase noise of the resulting RF output is in the range of -70 to -90dBc/Hz at 1MHz, and all below 100dBc/Hz at 10MHz. The circuit's IF-to-RF conversion gain is 30dB, with saturated output power around 5dBm, and the total power consumption is 260mW. Through the control of the power amplifier's drain bias, a 50dB power level difference can be obtained, thus allows signal modulation and further combination with the receiver. This 1100x650um(2) transmitter can be used as a prototypical circuit to explore next-generation mobile communication and civilian radar array systems.
A Balanced Digital Phase Shifter by a Novel Switching-Mode Topology
(2013-06-01)
Lin, Yun-Wei
;
Chou, Yi-Chieh
;
Chang, Chi-Yang
;
電信工程研究所
;
Institute of Communications Engineering
A balanced digital phase shifter by a novel switching-mode topology is proposed. A 3-bit balanced digital phase shifter is given as an example, the working bandwidth of which is from 2.3 to 2.7 GHz. The proposed 3-bit balanced phase shifter comprises two balanced loaded-line phase shifters (90 degrees and 45 degrees) and six twist-line broadband 180 degrees phase shifters. The balanced loaded-line digital phase shifter changes phases while the even-or odd-mode signal is excited. The 180 degrees phase shifter controls the balanced signal to be even or odd mode. The commensurate transmission line filter is used as the biasing circuit.
A compact wideband 180 degrees hybrid ring coupler using a novel interdigital CPS inverter
(2007)
Chi, Chun-Hsiang
;
Chang, Chi-Yang
;
電信工程研究所
;
Institute of Communications Engineering
This paper proposes a stepped-impedance wideband 180 degrees hybrid ring coupler with a novel frequency-independent 180 degrees phase inverter implemented by interdigital coplanar strip (CTS). Simple design equations for stepped-impedance lines and design curves for CTS/interdigital CTS are also presented. Due to the combination of a stepped-impedance structure and an ideal phase inverter, the proposed hybrid achieves size reduction, wide bandwidth, and excellent phase and amplitude performance. The size of this hybrid is about 13% of the conventional one. Experimental results show that this hybrid ring coupler centered at 2 GHz has a 10-dB return loss bandwidth of 97.5% from 0.98 to 2.93 GHz with 0.5 dB amplitude imbalance and 30 phase imbalance for both out-of-phase and in-phase operation. Its isolation is better than 30 dB from 0.5 to 4 GHz.
A High Slow-Wave Factor Microstrip Structure With Simple Design Formulas and Its Application to Microwave Circuit Design
(2012-11-01)
Chang, Wei-Shin
;
Chang, Chi-Yang
;
傳播研究所
;
Institute of Communication Studies
This paper proposes a new microstrip slow-wave structure. The unit cell comprises a Schiffman section of meander line and a shunt open-circuited stub. No via-holes and ground-plane patterns are required. Simple design formulas can be used to obtain line parameters, such as the characteristic impedance and phase velocity. According to the analysis, the characteristic impedance and slow-wave factor of the proposed slow-wave line can be independently controlled by merely two layout parameters. The proposed uniplanar structure only requires a single-layer substrate and is simply constructed using the conventional printed circuit board manufacturing process. A branch-line and a rat-race coupler were designed and fabricated using the proposed structure to demonstrate its feasibility. Their sizes are only 8.49% and 4.87% of the conventional ones, respectively. This novel slow-wave structure should find wide applications in compact microwave circuits.
A Novel Filter Bank Using Serial-Switched Structure
(2016-01-01)
Tsai, Hsiu-Min
;
Chou, Po-Jung
;
Chang, Chi-Yang
;
交大名義發表
;
National Chiao Tung University
A novel filter bank using serial-switched structure for the commercial bands of Band40, WIFI, and Band38 application is proposed. The proposed triple-band filter bank adopt the three order Chebyshev short-ended hairpin comb filters which embedded a pair of the PIN diodes as a switch. The simulated and measured results are matched well.
A novel five-pole microstrip cascade quadruplet filter
(2005)
Liao, Ching-Ku
;
Chang, Chi-Yang
;
電信工程研究所
;
Institute of Communications Engineering
A five-pole cascade quadruplet microstrip filter is presented. The source and load of the filter couple to two resonators respectively, which establishes two independent quadruplet blocks to control two independent pair of finite transmission zeros. The proposed tuning fingers are introduced to effectively control the strength of cross couplings. Compared to the eight-pole CQ filter, the proposed five-pole CQ filter provides an alternative choice of the filter with two pairs of transmission zeros but has less passband insertion loss. Both simulated and experimental results are given.
A reconfigurable filter based on doublet configuration
(2007)
Liao, Ching-Ku
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Chang, Chi-Yang
;
Lin, Jenshan
;
電信工程研究所
;
Institute of Communications Engineering
A surrogate model is proposed to model a previously published second-order tunable filter. The surrogate model can be represented by a coupling matrix in a doublet configuration, and a simple method based on the even-odd mode bisection is given to extract the coupling matrix. From the extracted parameters, one can decide how to design a filter with prescribed quasi-elliptic responses and how to adjust varactors to reconfigure the response. Using the proposed methods, the second-order filter can be configured to have a finite transmission zero on either the lower side or the upper side of the passband in a prescribed location even when the center frequency of the filter is tuned. Both simulated and measured results of an example are presented.
A software configurable coupler with programmable coupling coefficient
(2007)
Wang, Shih-Ming
;
Chang, Chi-Yang
;
Lin, Jenshan
;
電信工程研究所
;
Institute of Communications Engineering
A novel microstrip parallel coupler with tunable coupling coefficient is proposed. Two varactors are placed on microstrip parallel-coupled lines to tune the coupling coefficient. With proper combinations of the capacitances of two varactors, the coupling coefficient can be tuned from 10 dB to 6 dB with good return loss and directivity. By using the Labview program and data acquisition component, at software configurable coupler is implemented. This software configurable coupler will be useful in microwave instrumentation.
A Switchable Tunable Dual-Band Filter Using Varator Diodes for Tuning and Switching
(2017-01-01)
Chou, Po-Jung
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Hu, Chiao-Yi
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Chang, Chi-Yang
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電機工程學系
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Department of Electrical and Computer Engineering
A switchable tunable dual-band filter using varator diodes for band switching and frequency tuning is proposed. The tuning range of first band is from 2.3 to 2.8 GHz and second one is from 1.8 to 2.1 GHz. The proposed dual-band filter is composed of two second-order Chebyshev short-ended hairpin comb filters which embedded a pair of the varators as a switching and tuning elements. The simulated and measured results are matched well.
A vector-fitting formulation for parameter extraction of lossy microwave filters
(2007-04-01)
Liao, Ching-Ku
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Chang, Chi-Yang
;
Lin, Jenshan
;
電信工程研究所
;
Institute of Communications Engineering
In this letter, a formulation based on the vector fitting is applied to extract the equivalent circuit model from the frequency response of lossy cross-coupled microwave filters. By approximating the lossy response with short-circuit admittance parameters in partial fractional expansion form, the proposed method can evaluate the unloaded quality factor of resonators and extract the transversal coupling matrix simultaneously. The methodology of the vector fitting can identify the poles and residues of the short-circuit admittance parameters even when the poles are on the complex plane. And the extracted transversal coupling matrix can further transform into the prescribed form corresponding to the physical layout. The proposed method can be used in the tuning process of filter designs where the extraction of a coupling matrix is essential. To verify the method, a cross-coupled quadruplet filter is used as an example.
A W-band Quadrature Hybrid Coupled Substrate Integrated Waveguide Diplexer
(2015-01-01)
Cheng, Yu-Liang
;
Chen, Hung-Wei
;
Huang, Peng-Da
;
Chang, Chi-Yang
;
電機工程學系
A W-band quadrature hybrid coupled substrate integrated waveguide (SIW) diplexer is proposed in this paper. Instead of conventional 0.127 mm substrate for W-band circuitry, a 0.254 mm substrate is chosen for Q-value improvement. A WR-10 waveguide to 0.254 mm SIW transition is developed for measurement purpose. The diplexer comprises four Riblet short slot quadrature hybrids and two pairs of 3-pole SIW channel filters. The two passbands of the diplexer are 84 GHz 6% BW and 93 GHz 6% BW respectively. The measured results matched well with simulated ones.
A wideband bandpass filter with wide upper stopband using stepped-impedance cascadable 180 degrees hybrid rings
(2007-08-01)
Chi, Chun-Hsiang
;
Chang, Chi-Yang
;
電信工程研究所
;
Institute of Communications Engineering
This letter proposes a wideband bandpass filter by cascading two 3-dB stepped-impedance. cascadable 180 degrees hybrid rings with a pair of stepped-impedance lines. Thanks to the stepped-impedance lines, a broad upper stopband is achieved. The stepped-impedance vertically installed planar (VIP) coupler is used to implement the ideal 180 degrees phase inverter and crossovers. The experimental results show that this 2-GHz center frequency, fourth order filter has a 10-dB return loss bandwidth of 92.5% and upper stopband rejection levels of better than -20 dB up to 6.8, GHz. This proposed filter achieves wide passband and broad stopband performance simultaneously.
A wideband CPS bandpass filter with ultra-wide upper stopband using stepped-impedance rat-race hybrid couplers
(2007)
Chi, Chun-Hsiang
;
Chang, Chi-Yang
;
電信工程研究所
;
Institute of Communications Engineering
A wideband coplanar strip (CPS) bandpass filter using two 3-dB stepped-impedance rat-race hybrid couplers is proposed in this paper. The stepped-impedance structure results in both ultra-wide upper stopband and size reduction. The low impedance and high impedance CPS lines are realized using the interdigital structure for low impedance and conventional structure for high impedance, respectively. The ideal phase inverter has been implemented with hybrid CPS/interdigital CPS structure. Experimental results show that this 2-GHz fifth order filter depicts a 10-dB return loss bandwidth of 100% and upper stopband rejection levels of better than -40dB up to 17.5 GHz. This proposed filter achieves wide passband and ultra-wide stopband performance simultaneously. This filter is fabricated using CPS on 15-mil Al(2)O(3) substrate with a dielectric constant of 9.8. The measured results agree well with the simulated results.
Analysis and design of wideband active power splitter with interleaf transmission line topology
(2019-11-01)
Huang, Ching-Ying
;
Hu, Robert
;
Niu, Dow-Chi
;
Chang, Chi-Yang
;
電機學院
This article proposes a new wideband active power splitter design where the gain cells along the input transmission line are arranged in interleaf rather than the conventional parallel style, thus the circuit's high-frequency performance can be greatly improved. Both theoretical analysis and circuit simulation have been carried out; as a demonstration, parallel and interleaf active power splitters are designed using 0.1 mu m GaAs pseudo-morphic heterostructure field effect transistors (GaAs pHEMT) process and measured on-wafer. The results clearly indicate the superiority of the interleaf topology. A 40 GHz interleaf active power splitter in 90 nm complementary metal-oxide-semiconductor (CMOS) is then presented where the magnitude and phase imbalance between the two output ports are 0.15 dB and 2.6 degrees at 20 GHz, and 0.16 dB and 14 degrees at 40 GHz. The output-port isolation is better than 30 dB across the whole frequency range.
Analysis of wide-IF-band 65 nm-CMOS mixer for 77-110 GHz radio-astronomical receiver design
(2019-05-01)
Huang, Ching-Ying
;
Wu, Kun-Long
;
Hu, Robert
;
Chang, Chi-Yang
;
電子工程學系及電子研究所
This manuscript presents the design of a W-band receiver in which an radio frequency-low noise amplifier (RF-LNA), a wideband mixer, intermediate frequency (IF) amplification, a local oscillator frequency (LO) tripler and a driving amplifier are all integrated into one single chip of 1050 x 820 mu m(2). To effectively extend the mixer's IF bandwidth while retaining its conversion gain, impacts of the mixing transistor's drain bias and output loading impedance are explored using a dual-modulation conversion-matrix method, which allows both the LO-induced transconductance modulation and channel-conductance modulation to be considered simultaneously. It is shown that, by merging the input capacitance of the IF amplifier into a high-impedance artificial transmission line, an actively biased mixer can have constant conversion gain over broad bandwidth. A 77-110 GHz 65 nm-complementary metal-oxide-semiconductor (CMOS) receiver with 33 GHz IF bandwidth is then designed and measured. Its conversion gain and noise figure are 10 and 20 dB, respectively, and the input-referred P1 dB is -15 dBm; the overall power consumption is 330 mW under 1.3 V drain bias.
Analytical Design of Microstrip Short-Circuit Terminated Stepped-Impedance Resonator Dual-Band Filters
(2011-07-01)
Chang, Wei-Shin
;
Chang, Chi-Yang
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電信工程研究所
;
Institute of Communications Engineering
This paper proposes an analytical method to design a dual-band filter using the short-circuit terminated half-wavelength stepped-impedance resonator (SIR). The SIR has an advantage to easily control the first and second resonances by adjusting its structural parameters. In the proposed method, the structural parameters of the SIR are obtained analytically according to the two passband center frequencies and bandwidths of the filter. As a result, the achievable specifications of the dual-band filter can be rapidly determined. The coupling between adjacent SIRs is realized by a short-circuited stub, which is characterized as a K-inverter network. The dual-frequency transformer incorporated with the tapped-line input/output structure is used for the external coupling. Applying the analytical equations in the design process, a dual-band filter can be easily and quickly realized. More importantly, compared to the published dual-band filters, the proposed method is easier to design, especially for a relatively high-order dual-band filter. Two fourth-order and one sixth-order dual-band filters are designed and fabricated to demonstrate the proposed method.
Broadband Planar Magic-T with Marchand Type Power Divider and Balun
(2014)
Chou, Po-Jung
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Lin, Pei-Chieh
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Lin, Yun-Wei
;
Lu, Jhe-Ching
;
Chang, Chi-Yang
A new broadband high-order planar magic-T is proposed in this paper. The magic-T is formed by Marchand type power divider and balun. Exact synthesis method based on S-domain highpass prototype using Richard\'s theorem tits the magic-T with the user-defined specifications. By discussing the characteristic impedance of the common element shared by the balun and divider, the magic-T can be designed to match different output impedance. A high-order magic-T with wide bandwidth about 100% and reflection coefficient of -15dB is designed as an example where a combination of microstrip lines, slotlines, double-sided parallel-strip line (DSPSL) and coplanar striplines is applied. The simulation and measurement results are matched well.