Analysis of Input LCR Matched N-Path Filter

作者：Lu, Zhijian; Jin, Jing; Mo, Tingting; Zhou, Jianjun^*

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, 2016, 63(6): 795-805.

DOI：10.1109/TCSI.2016.2538098

• Band-pass filter
• impedance matching
• linear periodically time-variant (LPTV)
• N-path filter

Proposed in this paper is a general parasitic-compatible LCR matching method suitable for N-path filter. Analysis of a conventional L-type matching is extended to accommodate the case of the N-path filter, where the different impedances of the band limited input matching network at multiple local oscillation (LO) harmonic frequencies have to be taken into consideration. Compared to the ideally wideband transformer matching technique, the proposed LCR method has advantages of smaller size and better harmonic folding rejection ratio, while keeping the same properties, such as impedance matching, in-band voltage gain, noise figure and ultimate rejection. Based on the derived equations, the procedure to determine the values of the matching components for given rejection specs has been described using design examples.

• 出版日期2016-6
• 单位上海交通大学