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Search Results: 1 - 10 of 253015 matches for " Chieh-Pin Chang;Wei-Chih Chien;Chun-Chi Su;Yeong-Her Wang;Ja-Hao Chen "
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Linearity Improvement of Cascode Cmos Lna Using a Diode Connected Nmos Transistor with a Parallel RC Circuit
Chieh-Pin Chang;Wei-Chih Chien;Chun-Chi Su;Yeong-Her Wang;Ja-Hao Chen
PIER C , 2010, DOI: 10.2528/PIERC10082411
Abstract: A fully integrated 5.5 GHz high-linearity low noise amplifier (LNA) using post-linearization technique, implemented in a 0.18 μm RF CMOS technology, is demonstrated. The proposed technique adopts an additional folded diode with a parallel RC circuit as an intermodulation distortion (IMD) sinker. The proposed LNA not only achieves high linearity, but also minimizes the degradation of gain, noise figure (NF) and power consumption. The LNA achieves an input third-order intercept point (IIP3) of +8.33 dBm, a power gain of 10.02 dB, and a NF of 3.05 dB at 5.5 GHz biased at 6 mA from a 1.8 V power supply.
A 6:1 Unequal Wilkinson Power Divider with EBG CPW
Chieh-Pin Chang;Chun-Chi Su;Shih-Han Hung;Yeong-Her Wang;Ja-Hao Chen
PIER Letters , 2009, DOI: 10.2528/PIERL09032801
Abstract: A 6:1 unequal Wilkinson power divider that combines the advantages of a coplanar waveguide with an electromagnetic bandgap (EBG CPW) and microstrip line structures suitable for a PCB circuit design is proposed. The highly characteristic impedance transmission line (TL) is realized by employing the proposed EBG CPW structure, which is difficultly achieved using the conventional microstrip line or CPW due to printed circuit board (PCB) process limitations. The proposed EBG structure enables the CPW line to have a very high characteristic impedance of over 207 Ω. The fabricated 6:1 power divider delivers excellent matching and isolation performances with more than 34 dB at 1.5 GHz. It also has exact dividing ratios of 8.46 dB and 0.7 dB at two output ports, respectively.
A Single-Balanced Quadruple Subharmonical Mixer with a Compact IF Extraction
Yi-Chang Lee;Yung-Hsiang Chang;Shih-Han Hung;Wei-Chih Chien;Chun-Chi Su;Chia-Chin Hung;Chih-Ming Lin;Yeong-Her Wang
PIER Letters , 2011, DOI: 10.2528/PIERL11041601
Abstract: A novel 21-35 GHz single-balanced quadruple subharmonic monolithic passive mixer is fabricated using the 0.15 μm GaAs pHEMT process. This mixer consists of a local oscillation (LO) spiral balun and a radio frequency (RF) band pass filter which has an intermediate frequency (IF) extracted feature utilizing a pair of anti-parallel Schottky barrier diode to achieve quadruple subharmonic mixing mechanism. The RF band pass filter formed with an interdigital coupler and a low-pass network is used to reduce the chip dimension while operating at a low frequency band and to improve the isolation between the RF and IF ports with a broadband operation. From the measured results, the mixer exhibits 11.3-15.1 dB conversion loss, 28.8 dB-high RF-to-IF isolation, 40 dB-high LO-to-RF isolation, 60 dB-high 3LO-to-RF isolation over a 21-35 GHz RF bandwidth, and an input 1 dB compression power of 4 dBm. The compact IF extraction circuit supports an IF frequency ranging from DC to 3.1 GHz. The core chip size is only 0.67 × 0.75 mm.
A 20-31 GHz High Image Rejection Ratio Subharmonic Mixer
Yi-Chang Lee;Chien-Hung Liu;Shih-Han Hung;Chun-Chi Su;Yeong-Her Wang
PIER C , 2012, DOI: 10.2528/PIERC12011115
Abstract: A broadband monolithic image rejection subharmonic mixer using a standard 0.18 μm CMOS technology is proposed. This circuit is composed of a band-pass filter with an intermediate frequency (IF) extraction function that can simplify the block diagram of the image rejection mixer. The entire passive circuit is constructed using a broadside coupling structure to achieve a high level of integration. Based on measured results, the proposed mixer exhibits conversion loss of 15.5-18.5 dB at a local oscillator (LO) power of 13 dBm, whereas the 3 dB bandwidth ranges from 20 to 31 GHz (43.1%) with a miniature chip dimension of 0.77×0.81 mm. The LO-to-radio frequency (RF), 2LO-to-RF, and RF-to-IF isolation levels are higher than 22.5, 42.9, and 34.5 dB, respectively. The best image rejection ratio of 29 dBc with 20° phase compensation at 24.5 GHz can be achieved.
The Miniature Frequency Doubler Using Compensated Capacitive Line in Balun
Yu-Ann Lai;Chun-Nien Chen;Chun-Chi Su;Chih-Ming Lin;Yeong-Her Wang
PIER Letters , 2010, DOI: 10.2528/PIERL10060403
Abstract: A compact balanced frequency MMIC doubler using compensated capacitive line in Marchand balun is proposed. With multi-coupled lines technology, the balun is applied to a balanced doubler successfully. Compared with the conventional Marchand balun, more than 55% reduction in the length of coupled line can be achieved. Implemented by a PHEMT process, the compact monolithic balanced frequency doubler with better performance can be obtained. An operation bandwidth from 20 to 44 GHz with the best conversion loss of 8.4 dB at 25GHz can be achieved. In addition, the fundamental frequency suppression is better than 28.9 dB, and the chip dimension is as small as 0.41 × 0.68 mm.
A 16-31 GHz Miniature Quadruple Subharmonic Monolithic Mixer with Lumped Diplexer
Chih-Ming Lin;Jui-Ting Chang;Chun-Chi Su;Shih-Han Hung;Yeong-Her Wang
PIER Letters , 2009, DOI: 10.2528/PIERL09072705
Abstract: A novel 16-31 GHz quadruple subharmonic monolithic passive mixer with a chip dimension of 0.82×0.7 mm is designed and fabricated using the 0.15 μm GaAs pHEMT process. The novel configuration of the quadruple subharmonic mixer consists of a lumped frequency diplexer and a low-pass filter utilizing a pair of anti-parallel Schottky barrier diode to achieve quadruple subharmonic mixing mechanism. The lumped frequency diplexer formed with a low-pass network and a high-pass network is used to reduce the chip dimension while operating at low frequency band and to improve the isolation between the RF and LO ports with a broadband operation. The low-pass filter supports an IF frequency range from DC to 2.5 GHz. From the measured results, the mixer exhibits a 12.5-16.5 dB conversion loss, a LO-to-RF isolation better than 15 dB, a 50-59 dB high 4LO-to-RF isolation over 16-31 GHz RF bandwidth, and an input 1 dB compression power of 2 dBm.
A Broadband Doubly Balanced Monolithic Ring Mixer with a Compact Intermediate Frequency (IF) Extraction
Yi-Chang Lee;Chih-Ming Lin;Shih-Han Hung;Chun-Chi Su;Yeong-Her Wang
PIER Letters , 2011, DOI: 10.2528/PIERL10120904
Abstract: To meet the requirements for broadband operation, high port-to-port isolation, and miniature chip area, a doubly balanced monolithic microwave ring mixer with an advanced IF extraction fabricated using 0.15 μm GaAs pHEMT process is presented. A miniature Marchand-like spiral balun with low-pass filter is used to extract IF signals and maintain balun performance simultaneously. The low-pass filter can filter out both the RF and LO signals. This miniaturized mixer design can mitigate layout complexity, improve port-to-port isolations suitable for ultra-broadband Ku-, K-, and Ka-band applications. Subsequently, the LO/RF-to-IF isolations are greater than 43.2 and 32 dB from 11 to 40 GHz, respectively. The LO-to-RF isolation is between 26.9 and 50.7 dB within the same swept range. The conversion loss is 7.2-12.4 dB within the operating bandwidth.
A Compact Double-Balanced Star Mixer with Novel Dual 180° Hybrid
Yu-Ann Lai;Chun-Nien Chen;Chun-Chi Su;Shih-Han Hung;Chang Lun Wu;Yeong-Her Wang
PIER C , 2011, DOI: 10.2528/PIERC11080902
Abstract: A compact double-balanced monolithic star mixer for Ka-band applications using 0.25 μm GaAs pHEMT process is presented. With multi-coupled lines technology, the proposed dual 180° hybrid is produced and applied to a star mixer successfully. The proposed hybrid adopts the power divider and two types of multi-coupled lines to improve the return loss and isolation at the balance outputs of a traditional dual Marchand balun. Output ports are allowed to locate arbitrarily, eliminating a complex layout while the dual 180° hybrid is applied to double balanced star mixers. As the measurement results show, the proposed mixer achieves an operation bandwidth of 27 to 36 GHz with the best conversion loss of 6.3 dB at 28 GHz. In addition, the chip dimension can be manufactured as small as 0.81 mm.
A 9-21 GHz Miniature Monolithic Image Reject Mixer in 0.18-μM Cmos Technology
Wei-Chih Chien;Chih-Ming Lin;Yung-Hsiang Chang;Yeong-Her Wang
PIER Letters , 2010, DOI: 10.2528/PIERL10072602
Abstract: A compact 9-21 GHz monolithic image reject mixer (IRM) with a chip dimension of 0.9×0.74 mm has been designed and fabricated using a standard 0.18 μm CMOS technology. The compact configuration is composed of a 90°coupler for local oscillator (LO) and two doubly balanced ring mixers for mixing core. Particularly, a radio frequency (RF) dual balun with advanced intermediate frequency (IF) extraction technique can not only eliminate the use of power divider in IRM design, and simultaneously provide balanced signals for ring mixing, but also obtain high side band suppression without any additional IF low-pass filter. Moreover, the entire passive circuits are constructed by utilizing broad side coupling structure to achieve high-level integration further. From the measured results, the IRM exhibits a 19.4-22.4 dB conversion loss, a maximum image rejection ratio (IRR) of 34 dB, all port-to-port isolations better than 28 dB over RF frequency range of 9 to 21 GHz, and an input 1 dB compression power of 14 dBm.
A Compact Balun Based on Microstrip EBG Cell and Interdigital Capacitor
Chih-Ming Lin;Chun-Chi Su;Shih-Han Hung;Yeong-Her Wang
PIER Letters , 2009, DOI: 10.2528/PIERL09092904
Abstract: A novel compact balun (balanced-to-unbalanced) that consists of a low-pass network served by a microstrip electromagnetic bandgap (EBG) cell and a high-pass π-network formed with an interdigital capacitor is presented. This proposed approach can effectively operate the compact balun without the use of λ/4 microstrip lines to reduce the circuit area over 50% compared to the conventional Marchand balun. The core dimension of the compact balun is 0.74 cm x 0.7 cm. The planar structure enables an efficient circuit design in printed circuit boards (PCB) without using any bonding wires, defected ground structures (DGS), or surface mounted devices (SMD). A compact balun operating in the 3 GHz band has been implemented in a FR-4 PCB. From the measured results, the return loss of the input port is better than 15 dB over the band from 2.6 to 4 GHz. The amplitude and phase imbalances are less than 1.4 dB and 3° with the 20% operational bandwidth ranging from 2.7 to 3.3 GHz, respectively.
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