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

This paper presents the design of a low- voltage wide-band switched-capacitor (SC) filter for wireless communication receiver applications. The filter is the 5 th -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 3 rd -order input intercept point (IIP3) can be up to 27dBm. The filter was fabricated in a 0.25-µm 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.

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