Browsing by Author "Wu, Chih-Kai"

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A Wideband SiGe HBT Gilbert Micromixer With Differential-to-Single CE-CC Output Stage
(2007)
Syu, Jin-Siang
;
Meng, Chinchun
;
Wu, Chih-Kai
;
Huang, Guo-Wei
;
電信工程研究所
A wideband downconversion mixer is demonstrated using 0.35-mu m SiGe heterojunction bipolar transistor (HBT) technology. A micromixer topology is implemented in the RF port while a differential type shunt-shunt feedback amplifier and a differential-to-single CE-CC output buffer are used in the IF stage. ne frequency response analysis and systematic measurement approach for a wideband Gilbert mixer are proposed in this paper for each individual stage of local frequency (LO), radio frequency (RF), and intermediate frequency (IF). ne differential LO signals are generated by several off-chip 180 degree hybrids to cover more than 8:1 bandwidth. The downconversion Gilbert mixer achieves the conversion gain of 6 dB, IP(1dB) of -17.5 dBm, and IP(3) of -7 dBm. The power consumption is 37.5 mW at 3.3V supply voltage.
Broadband Gilbert micromixer with an LO Marchand balun and a TIA output buffer
(2006)
Tseng, Sheng-Che
;
Meng, Chinchun
;
Chang, Chia-Hung
;
Wu, Chih-Kai
;
Hung, Guo-Wei
A single-ended wideband downeonversion Gilbert micromixer is demonstrated in this paper using 0.35-um SiGe BiCMOS technology. Because of the wideband matching property of the micromixer, it can perform broad frequency translation. The TIA is utilized in the IF stage while a broadband Marchand balun is employed not only to generate differential LO signals but also to reserve the wideband operation of the mixer. This singleended wideband mixer has the conversion gain of 15 dB, IP(1dB) of 17 dBm, and IIP(3) of -6.5 dBm and works from 3.5 to 14.5 GHz. The input return loss is below -14 dB and the chip size is 1x1 mm(2).
Comparison of wideband Gilbert micromixers using SiGe HBT and GaInP/GaAs HBT technologies
(2008-09-01)
Syu, Jin-Siang
;
Meng, Chinchun
;
Wu, Chih-Kai
;
Huang, Guo-Wei
;
電信工程研究所
Wideband downconversion mixers are demonstrated by using both 0.35-mu m SiGe heterojunction bipolar transistor (HBT) and 2-mu m GaInP/GaAs HBT technologies. A micromixer topology is implemented in the RF port while a differential type shunt-shunt feedback amplifier and a differential-to-single CE-CC output buffer are used in the IF stage. The frequency response analysis and systematic measurement approach for a wideband Gilbert mixer are proposed in this article for each individual stage of local frequency (LO), radio frequency (RF), and intermediate frequency (IF). The differential LO signals are generated by several off-chip 180 degrees hybrids to cover more than 8:1 bandwidth. The SiGe HBT Micromixer achieves the conversion gain of 6 dB, IP(IdB) of -17.5 dBm, and IIP(3) of - 7 dBm with the 3.3-V supply voltage and the power consumption of 37.5 mW. On the other hand, the GaInP/GaAs HBT Micromixer achieves the conversion gain of 25 dB, IP(IdB) of -25 dBm, and IIP(3) of - 15 dBm with the 5-V supply voltage and the power consumption of 50 mW. (c) 2008 Wiley Periodicals, Inc.
Low-voltage GaInP/GaAs HBT wideband Gilbert downconverter using transformer RF balun
(2007)
Tseng, Sheng-Che
;
Meng, Chinchun
;
Wu, Chih-Kai
;
Huang, Guo-Wei
;
電信工程研究所
This paper demonstrates a low-voltage wideband downconverter along with an integrated transformer RF balun using the 2-mu m GaInP/GaAs HBT technology. This transformer is a symmetric type and plays a role as a single-to-differential balun. Without the parasitics between the transformer and the substrate, the transformer can work at higher frequencies. This transformer downconverter operates from 1.5 GHz to 14 GHz with around 20-dB conversion gain and 1.8-GHz IF 3-dB bandwidth. The frequency range of the mixing operation is wide and covers the digital video broadcasting via satellite (DVB-S) bands. This mixer hence is useful for DVB-S applications. Since there is no dc voltage drop on the transformer, the voltage supply of the mixer core is only 2.4 V and the current consumption is approximately 8.6 mA. The chip size of the entire mixer is 1 mm x 1 mm while the transformer occupies the estate of 150 mu m x 150 mu m.
Monolithic broadband Gilbert micromixer with an integrated Marchand balun using standard silicon IC process
(2006-12-01)
Tseng, Sheng-Che
;
Meng, Chinchun
;
Chang, Chia-Hung
;
Wu, Chih-Kai
;
Huang, Guo-Wei
A single-ended wideband downconversion Gilbert micromixer is demonstrated in this paper using 0.35-mu m SiGe BiCMOS technology. A transimpedance amplifier with resistive feedback is utilized in the IF stage while a broadband Marchand balun is employed to generate wideband differential local oscillator signals. The planar Marchand balun topology employed in this paper can generate truly balanced signals even in the presence of the lossy low-resistivity (similar to 10 Omega (.) cm) silicon substrate. A systematic approach to measure the frequency response of each individual stage in a Gilbert mixer is developed in this paper. This single-ended wideband mixer has the conversion gain of 15 dB, IP1dB of -19 dBm, IIP3 of -7 dBm, and the noise figure of 13 dB. The mixer works from 3.5 to 14.5 GHz.