Browsing by Author "Lin, M. -C."

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Design techniques for high-speed multirate multistage FIR digital filters
(2006-10-01)
Lin, M. -C.
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Chen, H. -Y.
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Jou, S. -J.
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
This paper presents architecture design techniques for implementing both single-rate and multirate high-speed finite impulse response (FIR) digital filters, with emphasis on the multirate multistage interpolated FIR (IFIR) digital filters. Well-known techniques to achieve high-speed and low-power applications for the single-rate digital FIR architecture are summarized, followed by the introduction of variable filter order selection, optimal filter decomposition, memory-saving and mirror symmetric filter pairs techniques which offer further gains in both performance and complexity reduction for the multirate multistage digital FIR architecture. A filter design example with TSMC 0.25 mu m standard cell for 64-QAM baseband demodulator shows that the area is reduced by 39% for low-complexity application. Moreover, for high-speed application, the chip can operate at 714 MHz. Finally, a designed decimator which is used in the CDMA cellular shows that the area is reduced by 70% as compared with conventional approach.
Gain flattened erbium-doped amplifier with 34 nm flat bandwidth
(2006-09-14)
Yeh, C. -H.
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Lin, M. -C.
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Chi, S.
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光電工程學系
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Department of Photonics
A gain-flattened two-stage erbium-based fibre amplifier module, structured by an erbium-doped waveguide amplifier and an erbium-doped fibre amplifier in serial, is proposed and demonstrated experimentally. In an operating range of 1528 to 1562 nm, all the gain is above 35 d13 and the noise figure is distributed from 5.5 to 6.7 dB, and +/- 1.1 dB maximum gain variation is retrieved at an input saturation power of -25 dBm. As a result, the proposed amplifier not only enhances gain value but possesses flatness in the operating region.