Design of voltage mode electronically tunable first order all pass filter in ±0.7 V 16 nm CNFET technology

• Main Authors: Masud, Muhammad (Author), A'ain, Abu (Author), Khan, Iqbal (Author), Husin, Nasir (Author)
• Format: Article
• Language: English
• Published: MDPI AG, 2019-01.
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: Get fulltext

 A novel voltage mode first order active only tuneable all pass filter (AOTAPF) circuit configuration is presented. The AOTAPF has been designed using ±0.7 V, 16 nm carbon nanotube field effect transistor (CNFET) Technology. The circuit uses CNFET based varactor and unity gain inverting amplifier (UGIA). The presented AOTAPF is realized with three N-type CNFETs and without any external passive components. It is to be noted that the realized circuit uses only two CNFETs between its supply-rails and thus, suitable for low-voltage operation. The electronic tunability is achieved by varying the voltage controlled capacitance of the employed CNFET varactor. By altering the varactor tuning voltage, a wide tunable range of pole frequency between 34.2 GHz to 56.9 GHz is achieved. The proposed circuit does not need any matching constraint and is suitable for multi-GHz frequency applications. The presented AOTAPF performance is substantiated with HSPICE simulation program for 16 nm technology-node, using the well-known Stanford CNFET model. AOTAPF simulation results verify the theory for a wide frequency-range.