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http://dx.doi.org/10.6109/jkiice.2013.17.10.2395

Active-RC Channel Selection Filter with 40MHz Bandwidth and Improved Linearity  

Lee, Han-Yeol (Department of Electronic Engineering, Kumoh National Institute of Technology)
Hwang, Yu-Jeong (Department of Electronic Engineering, Kumoh National Institute of Technology)
Jang, Young-Chan (Department of Electronic Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.17, no.10, 2013 , pp. 2395-2402 More about this Journal
Abstract
An active-RC channel selection filter (CSF) with the bandwidth of 40MHz and the improved linearity is proposed in this paper. The proposed CSF is the fifth butterworth filter which consists of a first order low pass filter, two second order low pass filters of a biquad architecture, and DC feedback circuit for cancellation of DC offset. To improve the linearity of the CSF, a body node of a MOSFET for a switch is connected to its source node. The bandwidth of the designed CSF is selected to be 10MHz, 20MHz and 40MHz and its voltage gain is controlled by 6 dB from 0 dB to 24 dB. The proposed CSF is designed by using 40nm 1-poly 8-metal CMOS process with a 1.2V. When the designed CSF operates at the bandwidth of 40 MHz and voltage gain of 0 dB, the simulation results of OIP3, in-band ripple, and IRN are 31.33dBm, 1.046dB, and 39.81nV/sqrt(Hz), respectively. The power consumption and layout area are $450{\times}210{\mu}m^2$ and 6.71mW.
Keywords
Channel selection filter; active-RC filter; biquad filter; DC feedback;
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