Browsing by Author "Jou, C. F."

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A 0.7 V transformer-feedback CMOS low-noise amplifier for 5-GHz wireless LAN
(2007)
Wu, H. I.
;
Fan, R. S.
;
Jou, C. F.
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傳播研究所
;
Institute of Communication Studies
In this paper, we present a 0.7V low-noise amplifier(LNA) using monolithic transformer feedback to neutralize the gate-drain overlap capacitance of a field-effect transistor (FET). It is a single-ended amplifier implemented in 0.18-mu m CMOS technology designing for 5-GHz wireless local-area networks (LANs). This LNA achieves a simulated power gain of 10.84dB, noise figure(NF) of 2.4 dB, and input referred 1 dB compression point (P I dB) of -8 dBm at 5.8 GHz. Operating from a 0.7-V supply, the power consumptions for the low noise amplifier(LNA) are 4.8 mW.
Design of low-voltage CMOS low-noise amplifier with image-rejection function
(2008-07-31)
Wei, L. -S.
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Wu, H. -I.
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Jou, C. F.
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電信工程研究所
;
Institute of Communications Engineering
A new design is presented that combines a low-noise amplifier (LNA) with an on-chip. lter instead of external. lter to eliminate image signal based on TSMC 0.18 mu m CMOS technology. The fully integrated 5.9 GHz LNA exhibits 15.2 dB gain, 3.2 dB noise figure, better than -15 dB input and output return loss, and -27 dB image rejection. The circuit operates at a supply voltage of 1 V and consumes only 6.1 mW power.
Microstrip-fed broadband circularly polarised monopole antenna
(2010-04-01)
Wu, J. -W.
;
Ke, J. -Y.
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Jou, C. F.
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Wang, C. -J.
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電信工程研究所
A microstrip-fed broadband circularly polarised (CP) monopole antenna was studied. A broad impedance bandwidth and wide axial ratio bandwidth (AR-BW) could be achieved simultaneously. This antenna used a conventional monopole architecture, except for its deforming ground plane and asymmetric-feed approach. The asymmetric-feed was used to provide an orthogonal component distinct from its original linear polarisation. In addition, by embedding a slit and a stub on the ground plane, this antenna could generate CP wave radiation and achieve a broad impedance bandwidth. According to the measurement results, the impedance bandwidth was 6.56 GHz for a 10 dB return loss, which covered a range of 2.32-8.88 GHz. The AR-BW was 1.2 GHz for a 3 dB AR, which covered a range of 3.2-4.4 GHz.