Browsing by Author "Ismail, Mohammed"

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A Wide Tuning Range G(m)-C Filter for Multi-Mode CMOS Direct-Conversion Wireless Receivers
(2009-09-01)
Lo, Tien-Yu
;
Hung, Chung-Chih
;
Ismail, Mohammed
;
電信工程研究所
;
Institute of Communications Engineering
A third-order channel selection filter for multi-mode direct-conversion receivers is presented. The filter is designed with a Butterworth prototype and with the target wireless applications of Bluetooth, cdma2000, Wideband CDMA, and IEEE 802.11a/b/g/n wireless LANs. Linear-region MOS transistors are used to perform voltage-to-current conversion. The wide tuning range is achieved by the current multipliers and linear voltage-to-current converters. Implemented in the TSMC 0.18 mu m CMOS process, the measurement results show that the filter can operate successfully over a cutoff frequency range of 500 kHz to 20 MHz, and is compliant with the requirements of different wireless applications. The power consumption is 4.1 mW to 11.1 mW for minimum and maximum cutoff frequencies respectively from a 1.2 V supply voltage. The circuit performance compares favorably with previously reported works.
A wide tuning range G(m)-C filter for multi-mode direct-conversion wireless receivers
(2007)
Lo, Tien-Yu
;
Hung, Chung-Chih
;
Ismail, Mohammed
;
電信工程研究所
;
Institute of Communications Engineering
A third-order channel selection filter for multi-mode direct-conversion receiver is presented. The filter is designed based on the Butterworth prototype with the target applications of Bluetooth, cdma2000, Wideband CDMA, and IEEE 802.11 a/b/g/n wireless LANs. Linear region MOS transistors are used to perform the voltage-to-current conversion. The wide tuning range can be achieved by the translinear loop followed by the linear voltage-to-current converter. Implemented in the TSMC 0.18-mu m CMOS process, the measurement results show that the filter can operate with the cutoff frequency of 500 kHz to 20 MHz, and thus meet the requirement of different wireless applications. In the design, the maximum power consumption is 11.1 mW under a 1.2-V supply voltage. The figure of merit (FOM) is favorably compared with the other previously reported works.
CMOS voltage reference based on threshold voltage and thermal voltage
(2010-01-01)
Lo, Tien-Yu
;
Hung, Chung-Chih
;
Ismail, Mohammed
;
電信工程研究所
;
Institute of Communications Engineering