Electronically tunable high-input impedance voltage-mode universal biquadratic filter based on simple CMOS OTAs |
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Authors: | Montree Kumngern Boonying KnobnobAuthor VitaeKobchai DejhanAuthor Vitae |
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Affiliation: | Department of Telecommunications Engineering, Faculty of Engineering, King Mongkut''s Institute of Technology Ladkrabang, Bangkok 10520, Thailand |
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Abstract: | This paper describes a new electronically tunable three inputs and single output voltage-mode universal biquadratic filter based on simple CMOS operational transconductance amplifiers (OTAs) and grounded capacitors. The proposed configuration provides lowpass, highpass, bandpass, bandstop and allpass voltage responses at a high impedance input terminal, which enable easy cascadability. Additionally, the circuit parameters ωo and Q can be set orthogonally by adjusting the transconductances and grounded capacitors. The filter also offers an independent electronic control of parameters ωo by adjusting the transconductance through the bias current/voltage of the OTA. For realizing all the filter responses, no critical component matching condition is required, and all the incremental parameter sensitivities are low. PSPICE simulation results are performed to confirm the theoretical analysis. |
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Keywords: | Voltage-mode OTA Electronically tunable Universal filter CMOS |
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