Browsing by Author "Sung, CC"

Now showing 1 - 4 of 4

Dynamics of an optical resonator determined by its iterative map of beam parameters
(1998-01-15)
Wei, MD
;
Hsieh, WF
;
Sung, CC
;
光電工程學系
;
Department of Photonics
We use the residue of the map to study the stability and Gaussian beam dynamics of a general optical resonator. The map is constructed from space domain matrix formalism. For a lossless system we find that the residue is a function of resonator g-parameters' product and new critical stable curves exist within the geometrically stable regions. The dynamic behavior of a dissipative resonator with loss optical element is similar to a damping oscillatory motion and can be determined by the corresponding conservative resonator without those loss elements. (C) 1998 Elsevier Science B.V.
Low power CMOS wideband receiver design
(2004)
Sung, CC
;
Chou, MF
;
Wu, CC
;
Chen, CS
;
Wen, KA
A low power CMOS receiver for ultra-wideband (UWB) wireless applications is presented. The low-noise amplifier (LNA) building block employing stagger tuning technique consists of two common-source stages with different resonance frequencies to achieve low power consumption and wide operating bandwidth. In addition, the variable gain amplifier (VGA) follows the passive mixer employs a novel wide-range pseudo-exponential circuit topology. This work was implemented in 0.18-mu m CMOS process exhibits 280-MHz bandwidth and draws 27.4 mA on average from a 1.8-V supply. The receiver has a minimum noise figure of 2.6 dB, and maximum IIP3 of -33 dBm across the UWB group 1 bands.
The preferable resonators for Kerr-lens mode-locking determined by stability factors of their iterative maps
(1998-10-15)
Wei, MD
;
Hsieh, WF
;
Sung, CC
;
光電工程學系
;
Department of Photonics
The generalized stability factor of a general resonator was obtained from its iterative map based on the linear stability analysis. Since a physical system tends to stay with high stability, the preferred resonator for Kerr-lens mode-locking (KLM) is determined by the relative stability between KLM and CW operations. With this criterion the preferable KLM regions agree with the previous experimental self-starting regions when the Ken medium is located around the center of the resonator. (C) 1998 Elsevier Science B.V. All rights reserved.
The preferable resonators for Kerr-lens mode-locking determined by stability factors of their iterative maps
(1998-10-15)
Wei, MD
;
Hsieh, WF
;
Sung, CC
;
光電工程研究所
;
Institute of EO Enginerring
The generalized stability factor of a general resonator was obtained from its iterative map based on the linear stability analysis. Since a physical system tends to stay with high stability, the preferred resonator for Kerr-lens mode-locking (KLM) is determined by the relative stability between KLM and CW operations. With this criterion the preferable KLM regions agree with the previous experimental self-starting regions when the Ken medium is located around the center of the resonator. (C) 1998 Elsevier Science B.V. All rights reserved.