Journal of Guangxi Normal University(Natural Science Edition) ›› 2019, Vol. 37 ›› Issue (4): 37-44.doi: 10.16088/j.issn.1001-6600.2019.04.004

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A Low-Loss, Low-Noise, Wide-Tuned High-Order Cascade N-Path Filter

XIE Lina, JIANG Pinqun*, SONG Shuxiang, CEN Mingcan   

  1. College of Electronic Engineering, Guangxi Normal University, Guilin Guangxi 541004,China
  • Received:2018-12-17 Online:2019-10-25 Published:2019-11-28

Abstract: In recent years, N-path filters have been widely used in many fields such as radio frequency communication and cognitive radio. In order to reduce the loss and noise of the filter and expand its tunable range, this paper introduces series inductance into the traditional first-order N-path filter, and cascades them to obtain a high-order N-path filter with low loss, low noise and wide tuning. The transfer function of the high-order N-path filter is obtained by the adjoint network method. The use of the adjoint network method greatly simplifies the mathematical derivation of the transfer function. The Cadence simulation results in the TSMC 0.18 μm CMOS process show the correctness of the transfer function. The Cadence simulation results also show that when the power supply voltage is 1.2V, the adjustable range of center frequency of the high-order N-path filter is 0.4-3.0 GHz, the insertion loss is 1.6 dB, the return loss is 11.6 dB, and the noise figure is 0.2-0.8 dB. Compared with the published filter, the comprehensive performance of the new filter has greatly improved, and it can be applied to a high-performance receiver.

Key words: N-path filter, high-order cascade, low loss, low noise, wide tuning, adjoint network method

CLC Number: 

  • TN713
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