Browsing by Author "Teng, Y. -H."

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10 GHz dual-conversion low-IF downconverter with microwave and analogue quadrature
(2009-06-18)
Syu, J. -S.
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Meng, C.
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Teng, Y. -H.
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電信工程研究所
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Institute of Communications Engineering
A 10 GHz dual-conversion low-IF downconverter using 0.18-mm CMOS technology is demonstrated. The high-frequency quadrature RF and LO(1) signals are generated by broadside-coupled quadrature couplers while a two-section polyphase filter is utilised for the low-frequency LO(2) quadrature signal generation. As a result, the demonstrated downconverter achieves a conversion gain of 7 dB, IP(1dB) of -16 dBm, IIP(3) of 25 dBm and noise figure of 26 dB at a 1.8 V supply. The image-rejection ratio of the first/second image signal is 33/42 dB for IF frequency ranging from 10 to 60 MHz, respectively.
INTERCONNECTION LOSS FROM SUBSTRATE EFFECTS ON LNA PERFORMANCE AND DESIGN ACCURACY
(2009-01-01)
Tseng, S. -C.
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Meng, C. C.
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Liao, H. -Y.
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Lin, Y. -C.
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Teng, Y. -H.
A 5.2 GHz 0.18-mu m SiGe BiCMOS low noise amplifier is implemented with guided-wave interconnections in this letter. These interconnections reduce the substrate skin and proximity effects and hence are suitable for high frequency circuits. The guided interconnections bring 1.7-dB gain and 0.55-dB noise figure enhancement for the low noise amplifier. In addition, accurate and simple design methodology relies on the complete models of components and interconnections when the poststimulation from the rc extraction is not enough for the high,frequency circuit design. The measurement results give excellent agreements with the schematic simulation. (C) 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 144-146, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23968
UWB Gilbert downconverter utilising a wideband LR-CR quadrature generator
(2009-05-07)
Syu, J. -S.
;
Meng, C.
;
Teng, Y. -H.
;
電信工程研究所
;
Institute of Communications Engineering
An ultra-wideband (UWB) I/Q downconverter with an LR-CR quadrature generator is demonstrated using 0.35 mu m SiGe HBT technology. The I/Q outputs of this generator are always in quadrature phase at any frequency while the BJT-type active mixer inherently tolerates much LO power difference for a. at gain response. Consequently, the amplitude imbalance and phase error of the I/Q outputs are less than 1 dB and 2 degrees in the RF frequency range 3-11 GHz.