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Systematic Synthesis of Compressive VDTA-Based T-T Filter with Orthogonal Control of f_o and Q 被引量:3
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作者 Yong-An Li Yan-Hua Xi Zhan-Ting Fan 《Journal of Electronic Science and Technology》 CAS CSCD 2020年第3期276-286,共11页
Based on sixteen nullor-mirror models of the voltage differencing transconductance amplifier (VDTA) and port admittance matrices of the tow-Thomas (T-T) filter with orthogonal control between the characteristic freque... Based on sixteen nullor-mirror models of the voltage differencing transconductance amplifier (VDTA) and port admittance matrices of the tow-Thomas (T-T) filter with orthogonal control between the characteristic frequency(f_0) and figure of merit (Q),two different categories of the voltage-mode and transconductance-mode T-T filters are synthesized by the means of the nodal admittance matrix (NAM) expansion method.The category A filter that employs two compressive VDTAs and two grounded capacitors includes four structures,and the category B filter that uses two compressive VDTAs,two grounded capacitors,and one grounded resistor,also includes four structures.These circuits are suitable for integrated circuit manufacture,and their parameters f_0 and Q can be orthogonally adjusted with varying the bias currents of VDTAs.After the paper and pencil test is completed,the computer analyses,including alternating current (AC),parameter sweep,Monte Carlo (MC),and noise analyses,are performed to support the synthesis approach. 展开更多
关键词 Compressive voltage differencing transconductance amplifier(compressive VDTA) nodal admittance matrix(NAM)expansion method systematic synthesis tow-Thomas(T-T)filter
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Synthesis for Current-Mode Sallen-Key Filter Using VDTAs 被引量:5
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作者 LI Yongan 《Wuhan University Journal of Natural Sciences》 CAS CSCD 2020年第5期428-434,共7页
In this work, an original Sallen-Key second-order low-pass filter is first turned into a current-mode one by means of the adjoint network theorem. Two nodal admittance matrices(NAM) of the filter are then educed. Furt... In this work, an original Sallen-Key second-order low-pass filter is first turned into a current-mode one by means of the adjoint network theorem. Two nodal admittance matrices(NAM) of the filter are then educed. Furthermore, these two matrices are expanded through NAM expansion approach, generating one current-mode Sallen-Key filter, which uses two compact voltage differential trans-conductance amplifiers(VDTAs) and two grounded capacitors, implements not only one low-pass transfer function but two band-pass transfer functions, and provides the non-interrelated control between the natural frequency and quality factor. As an example of the synthesized filter, a second-order VDTA filter with fo=1 MHz, Q=1, HLP=-HBP1=HBP2=1 is designed. The used synthesis approach has been confirmed with the help of circuit and computer analysis. 展开更多
关键词 current-mode circuit Sallen-Key analog filter compact voltage differential trans-conductance amplifiers(VDTA) adjoint network theorem nodal admittance matrix expansion
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Pathological Models of EXCCCII and Its Applications in Oscillator Synthesis 被引量:3
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作者 LI Yongan HOU Jingqiang 《Wuhan University Journal of Natural Sciences》 CAS CSCD 2021年第1期115-122,共8页
After giving six different forms of the extra X second-generation current-controlled conveyor(EXCCCII),pathological models of six EXCCCIIs are found by the nodal admittance matrix(NAM)expansion approach.Furthermore,th... After giving six different forms of the extra X second-generation current-controlled conveyor(EXCCCII),pathological models of six EXCCCIIs are found by the nodal admittance matrix(NAM)expansion approach.Furthermore,these ideal pathological circuit models are employed and 36 Wien oscillators and 8 third-order quadrature oscillators are synthesized by the NAM expansion.The hand analysis and computer analysis are introduced to prove the synthesized circuits are correct and effective. 展开更多
关键词 Wien oscillator third-order quadrature oscillator pathological element extra X second-generation current-controlled conveyor nodal admittance matrix expansion
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