Resistorless Reconfigurable nth-Order Filter Based on DPCDTA for Multi-mode Filtering Applications

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• 作者：Zhenhua Hu ; Chunhua Wang ; Zanming Xia…
• 关键词：DPCDTA ; nth ; order filter ; Reconfigurable ; Current ; mode
• 刊名：Arabian Journal for Science and Engineering
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：40
• 期：8
• 页码：2423-2436
• 全文大小：3,123 KB
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• 作者单位：Zhenhua Hu (1)
  Chunhua Wang (1)
  Zanming Xia (1)
  Jun Kuang (1)
  
  1. College of Information Science and Engineering, Hunan University, Changsha, 410082, Peoples-Republic of China
  
• 刊物类别：Engineering
• 刊物主题：Engineering, general
  Mathematics
  Science, general
  
• 出版者：Springer Berlin / Heidelberg

文摘

This paper presents a new topology for realizing current-mode reconfigurable nth-order filter for multi-mode wireless communication equipments, which is based on a new active device, namely digitally programmable current differencing transconductance amplifier (DPCDTA). The proposed filter is resistorless, and it employs n DPCDTAs and n grounded capacitors with one input and one output terminals. The signal path of the filter does not contain any switches, and wide tuning coefficient of the filter is implemented using programmable current division network with zero standby power consumption in the DPCDTA. Also, the proposed topology exhibits broader programmable features to accommodate wide range of selectivity requirements, which can be used as the most compatible structure for field-programmable analog array and very suitable for multi-mode filtering applications. The programming ability of variable filter orders from first to fourth providing low-pass, high-pass, and band-pass responses, and programming ability of variable cutoff frequencies from 1.14 to 11.75?MHz are given as application examples. The performance of the circuits have been verified and evaluated through post-layout simulations using Cadence IC5141 with GlobalFoundries-/em> 0.18?μm CMOS process.