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Analysis and design of 4-path filter using gyrator based complex impedance
Karami, P ; Sharif University of Technology
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- Type of Document: Article
- DOI: 10.1016/j.aeue.2016.09.010
- Publisher: Elsevier GmbH
- Abstract:
- A novel N-path filter using a complex impedance is designed to replace the frontend SAW filters in receivers with on-chip bandpass filters. It is demonstrated that the center frequency of the filter can be tuned solely by changing the value of some capacitances without the need to change the clock frequency. In addition, thanks to the use of smaller capacitors, the silicon area is reduced compared to similar designs. The high-Q bandpass filter is realized utilizing two gyrators and an arrangement of four baseband capacitors with NMOS switches, driven by 4-phase 25% duty cycle clock signals. This paper also analyzes the performance of the proposed filter against imperfections such as thermal noise of the switches. It will be shown that the noise performance of the proposed circuit is in an acceptable range
- Keywords:
- N-path filter ; Acoustic surface wave filters ; Clocks ; Gyrator ; Switched filter ; Thermal noise ; Center frequency ; Clock frequency ; Complex impedance ; MOS switche ; NMOS switche ; Noise performance ; On-chip bandpass filter ; Quality factor ; Bandpass filter
- Source: AEU - International Journal of Electronics and Communications ; Volume 70, Issue 11 , 2016 , Pages 1532-1542 ; 14348411 (ISSN)
- URL: http://www.sciencedirect.com/science/article/pii/S1434841116307452