A method for rejecting 3k-th harmonics in bandpass 6N-path filters |
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Authors: | Amin Hazrati Ali Jalali Masoud Meghdadi Bardia Babaei |
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Affiliation: | Electrical Engineering Department, Shahid Beheshti University, Tehran, Iran |
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Abstract: | In this paper, a method for 3 -th ( ) harmonics rejection in 6 -path filters is proposed, and the related analysis is provided. Using a single-ended-input to differential-output structure, the filter selectivity around even harmonics are also suppressed. Accordingly, a proof-of-concept band-pass filter is designed, and postlayout simulations in the 90-nm CMOS technology are carried out, which covers an input frequency range from 200 MHz to 1.2 GHz with a channel bandwidth of 10 to 15.5 MHz. The achieved third harmonic rejection at 1-GHz local oscillator (LO) frequency is about 43 dB. Over the entire radio frequency (RF) range, the in-band IIP3 and noise figure are better than 1.5 dBm and 5.3 dB, respectively. The power consumption of the analog circuitry is 21 mW from the 1.2-V supply, whereas the digital clock generation circuitry consumes between 0.9 and 5.2 mW, depending on the center frequency of the filter. |
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Keywords: | band-pass filter harmonic rejection low-pass filter N-path filter voltage recombiner |
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