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A 1.2-V Wide-Band SC Filter for Wireless Communication Transceivers  

Yang, Hui-Kwan (Univ. of Seoul)
Cha, Sang-Hyun (Univ. of Seoul)
Lee, Seung-Yun (Univ. of Seoul)
Lee, Sang-Heon (Univ. of Seoul)
Lim, Jin-Up (Univ. of Seoul)
Choi, Joong-Ho (Univ. of Seoul)
Publication Information
JSTS:Journal of Semiconductor Technology and Science / v.6, no.4, 2006 , pp. 286-292 More about this Journal
Abstract
This paper presents the design of a low-voltage wide-band switched-capacitor (SC) filter for wireless communication receiver applications. The filter is the 5th-order Elliptic lowpass filter. With the clock frequency of 50MHz implying that an effective sampling frequency is 100MHz with double sampling scheme, the cut-off frequency of the filter is programmable to be 1.25MHz, 2.5MHz, 5MHz and 10MHz. For low-power systems powered by a single-cell battery, the SC filter was elaborately designed to operate at 1.2V power supply. Simulation result shows that the 3rd-order input intercept point (IIP3) can be up to 27dBm. The filter was fabricated in a $0.25-{\mu}m$ 1P5M standard CMOS technology and measured frequency responses show good agreement with the simulation ones. The current consumption is 34mA at a 1.2V power supply.
Keywords
Switched-capacitor (SC) filters; Wireless Communication; Low-voltage; Double-sampling;
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