Browsing by Author "Chang, Wei-Hsiu"

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15MHZ WIDE TUNING-RANGE OTA WITH-69dB HD3 AND ITS APPLICATION TO GM-C FILTER
(2011)
Lin, Jun-Ye
;
Chang, Wei-Hsiu
;
Hung, Chung-Chih
;
電機工程學系
;
Department of Electrical and Computer Engineering
This paper presents a high linearity operational transconductance amplifier (OTA). The OTA circuit combines the techniques of the double differential pairs (DDP) and Source-degenerated current mirrors to achieve high linearity in a large GM tuning range. With the Gm values ranged from 60 mu S to 130 mu S, the HD3 of the OTA is below -69dB at 15MHz. The OTA has been applied to a fourth-order linear phase low-pass filter for high speed system. The fourth-order low-pass filter with the cutoff frequency of 15MHz has been implemented. The filter is designed by 0.18-mu m CMOS process technology, the HD3 performance is about -53dB, and the group delay variation is below 5% at cutoff frequency.
-65dB HD3 CMOS TUNABLE OTA WITH MOBILITY REDUCTION COMPENSATION
(2011)
Cheng, Shih-Tung
;
Chang, Wei-Hsiu
;
Hung, Chung-Chih
;
電機工程學系
;
Department of Electrical and Computer Engineering
This paper presents a high linearity operational transconductance amplifier (OTA) base on the technique of mobility reduction compensation, which achieves great linearity improvement and has wide input range at low power consumption. The third-order harmonic distortion (HD3) of the OTA is about -65dB at 1MHz for a 1.2-V-pp differential input. The OTA was designed by the TSMC 0.18-mu m CMOS process technology. For 1.8-V supply voltage, the static power consumption is only 0.427mW.