Abstract
In this paper, a 4 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> -order dual-mode active filter was implemented in 0.18μm CMOS process. Center frequency changed from 2.3 GHz to 2.7 GHz in band-select and channel-select modes. Quality factor was 25-100 with 17 dB Gain for band-select mode and 100-500 with 40 dB Gain in channel-select mode. Novel method for tuning Q was designed based on changing NIC factor. Center frequency deviations were compensated for by an analog input. Filter power consumption and input reflection ratio were 6.45 mW and -14 dB, respectively. The main application of this filter was for IEEE 802.11 receivers.
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