A novel Q-enhanced LC switched-capacitor bandpass filter for digital wireless RF applications

Design of switched capacitor Q-enhanced filter in 0.18µm CMOS technology for applications in UHF band

“…The command signals are applied to the N switches (X 1(t) to XN(t)) which are successively closed with a switching period TO, during a slot time equal to TOIN (Fig. 2), thus the N paths of this comb filter are successively activated during TOIN [6][7].…”

“…Unlike passive filters, which have high insertion losses and are off-chip with prohibitive manufacturing costs [4][5], switched capacitors filters can be fully integrated in low cost CMOS technology which increase the operating frequency [6][7]. The remarkable characteristic of filters based on CMOS technology industry is that their performances increase and their cost decreases as their size is reduced, for designers this has been a great challenge for few years [7], [8][9].…”

A CMOS High-Q LC Eight-Path Bandpass Filter for Wireless Broadband Applications

“…The main advantages of this novel architecture are both to reduce the thermal noise figure due to the input resistor and to improve the quality factor according to input inductor value [10]. Furthermore, this new configuration will allow a good dynamic range due to the second-order behavior brought by the new basic cell.…”

Active N-path Filters: Theory and Design

“…These two main issues reduced the attention of researchers for N-path filters. The substantial improvement in the speed and the matching properties of CMOS technology renewed a great interest into N-path filters [95,96,97,98,99,100,101,102,103,104,105]. Because the main constituents of N-path filters are switches and capacitors, CMOS technology is the best candidate for the realization of this type of filters.…”

“…An N-path BPF [81] that has recently attracted much attention [95,96,97,98,99,101,102,103,104,105] is illustrated in Fig. 2.19(a) where the on-resistance of the switches is modeled by a series resistance, R sw .…”