As the CMOS analog and digital hybrid mode IC follows the System on chip trend, many researchers have studied to design low-voltage low-power CMOS analog circuit have for years or even decades. Especially, the core element in producing chip converted from passive circuit of resistance (R), inductor ...
As the CMOS analog and digital hybrid mode IC follows the System on chip trend, many researchers have studied to design low-voltage low-power CMOS analog circuit have for years or even decades. Especially, the core element in producing chip converted from passive circuit of resistance (R), inductor (L), and capacitor (C) to active circuit is passive inductor. Researches on conversion of passive inductor to active inductor have been continued since CMOS operational amplifier appeared. Many methods use amplifier to convert passive inductor to active inductor. Among them, one that uses FDNR (Frequency-dependent negative resistance) and gyrator has been widely used. In this paper a new method is proposed for realizing active floating inductors from voltage differencing transconductance amplifier(VDTA) which is being studied nowadays. The Voltage differencing transconductance amplifier (VDTA) introduced from the reference [4] and [5] is a circuit to convert and amplify the differential input voltage. The research showed that conversion possibility to smaller chip, easier conversion method, and adjustable value of converted active inductance, etc make VDTA very useful. The inductor connection methods are two; the grounding inductor only earths one end of it, and the floating inductor doesn’t ground both ends. According to the recent study, the reference [10], it introduces a way to use VDTA to convert into active inductor. This method converts grounding inductor into one VDTA element and one capacitor. In case of floating inductor, it is converted into two VDTA and one capacitor. This proposed method employs only one VDTA and one transconductance for designing an active inductor from a passive floating and grounding inductors and implementing it to integrated circuits. The number of CMOS transistors can be considerably reduced from 6∼18 as 1∼3 s can be eliminated and even without the design can be made, which can help in reducing the size of the circuit and power consumption. The proposed the floating and grounding inductor using VDTA was successfully used in constructing 2MHz second order biquad active Lowpass, Highpass, Bandpass and Band reject filter. By summarizing the results of lowpass, highpass, bandpass filter, and band reject filter, it confirms that passive filter and the proposed 2MHz filter characteristics which uses the floating and grounding inductor using VDTA is approaching ideal figures closely. It confirmed that the flating and grounding inductor using VDTA in this study can be utilized usefully in floating and grounding inductor filter design.
As the CMOS analog and digital hybrid mode IC follows the System on chip trend, many researchers have studied to design low-voltage low-power CMOS analog circuit have for years or even decades. Especially, the core element in producing chip converted from passive circuit of resistance (R), inductor (L), and capacitor (C) to active circuit is passive inductor. Researches on conversion of passive inductor to active inductor have been continued since CMOS operational amplifier appeared. Many methods use amplifier to convert passive inductor to active inductor. Among them, one that uses FDNR (Frequency-dependent negative resistance) and gyrator has been widely used. In this paper a new method is proposed for realizing active floating inductors from voltage differencing transconductance amplifier(VDTA) which is being studied nowadays. The Voltage differencing transconductance amplifier (VDTA) introduced from the reference [4] and [5] is a circuit to convert and amplify the differential input voltage. The research showed that conversion possibility to smaller chip, easier conversion method, and adjustable value of converted active inductance, etc make VDTA very useful. The inductor connection methods are two; the grounding inductor only earths one end of it, and the floating inductor doesn’t ground both ends. According to the recent study, the reference [10], it introduces a way to use VDTA to convert into active inductor. This method converts grounding inductor into one VDTA element and one capacitor. In case of floating inductor, it is converted into two VDTA and one capacitor. This proposed method employs only one VDTA and one transconductance for designing an active inductor from a passive floating and grounding inductors and implementing it to integrated circuits. The number of CMOS transistors can be considerably reduced from 6∼18 as 1∼3 s can be eliminated and even without the design can be made, which can help in reducing the size of the circuit and power consumption. The proposed the floating and grounding inductor using VDTA was successfully used in constructing 2MHz second order biquad active Lowpass, Highpass, Bandpass and Band reject filter. By summarizing the results of lowpass, highpass, bandpass filter, and band reject filter, it confirms that passive filter and the proposed 2MHz filter characteristics which uses the floating and grounding inductor using VDTA is approaching ideal figures closely. It confirmed that the flating and grounding inductor using VDTA in this study can be utilized usefully in floating and grounding inductor filter design.
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