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Author: search.filters.author.Satansup, JetsdapornSubject: search.filters.subject.Current-mode circuit

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    1.5-V CMOS current multiplier/divider
    (2018-06-01)
    Satansup, Jetsdaporn
    ;
    Tangsrirat, Worapong
    A circuit technique for designing a compact low-voltage current-mode multiplier/divider circuit in CMOS technology is presented. It is based on the use of a compact current quadratic cell able to operate at low supply voltage. The proposed circuit is designed and simulated for implementing in TSMC 0.25-μm CMOS technology with a single supply voltage of 1.5 V. Simulation results using PSPICE, accurately agreement with theoretical ones, have been provided, and also demonstrate a maximum linearity error of 1.5%, a THD less than 2% at 100 MHz, a total power consumption of 508 μW, and -3dB small-signal frequency of about 245 MHz.
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    Compact VDTA-based current-mode electronically tunable universal filters using grounded capacitors
    (2014-01-01)
    Satansup, Jetsdaporn
    ;
    Tangsrirat, Worapong
    This paper presents a compact current-mode three-input single-output (TISO) type universal filter. Only one voltage differencing transconductance amplifier (VDTA) and two grounded capacitors are employed in the proposed filter. The circuit can realize lowpass, bandpass, highpass, bandstop and allpass biquadratic filter outputs by connecting the appropriate inputs, and offers electronic control of the natural angular frequency (ω<inf>0</inf>) and quality factor (Q) by means of adjusting the transconductance gain of the VDTA. In addition, by slight modification of the proposed scheme, another more useful TISO construction with orthogonal ω<inf>0</inf>-Q tuning has been obtained. Both the discussed universal filters have been shown to have low incremental active and passive sensitivities. To demonstrate the performances of the filters and verify the theoretical analysis, computer simulations are accomplished with the PSPICE program. © 2014 Elsevier Ltd.
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    Electronically tunable current-mode universal filter using VDTAs and grounded capacitors
    (2013-01-01)
    Satansup, Jetsdaporn
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    In this paper, an electronically tunable current-mode universal filter with three inputs and one output employing two voltage differencing transconductance amplifier (VDTA) and two grounded capacitors is proposed. The presented circuit can configure to realize all the five standard biquadratic filter functions; lowpass, bandpass, highpass, bandstop and allpass without changing the circuit configuration and needing an external passive resistor. The proposed filter is capable of providing an independent current-control of the natural angular frequency (ωo) and quality factor (Q) through the VDTA's transconductance and low incremental active and passive sensitivities. The performance of the proposed filter is tested using PSPICE simulation program, and the results agree well with the theoretical analysis.
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    Single-input five-output electronically tunable current-mode biquad consisting of only ZC-CFTAs and grounded capacitors
    (2011-12-14)
    Satansup, Jetsdaporn
    ;
    Tangsrirat, Worapong
    This paper presents an electronically tunable current-mode biquadratic filter constructing with four Z-copy current follower transconductance amplifiers (ZC-CFTAs) and only two grounded capacitors. The presented filter can realize all the five standard biquadratic functions simultaneously without requiring any component matching conditions and connecting any relevant output currents. The circuit has one low-impedance input and five highimpedance outputs, resulting in easy cascadability in current-mode. Also, the developed circuit exhibits the advantage of non-interactive electronic control of the natural angular frequency (ω<inf>0</inf>) and the quality factor (Q{script}) along with low incremental active and passive sensitivities. Computer simulation results using PSPICE program are given to confirm the validity of the theoretical prediction and to point out the attractive performance of the circuit.
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    Realization of current-mode KHN-equivalent biquad filter using ZC-CFTAs and grounded capacitors
    (2011-12-01)
    Satansup, Jetsdaporn
    ;
    Tangsrirat, Worapong
    In this paper, a current-mode Kerwin-Huelsman-Newcomb (KHN) filter structure employing four z-copy current follower transconductance amplifiers (ZC-CFTAs) and two grounded capacitors is proposed. The circuit structure has one low-impedance current input and three high-impedance current outputs and enables realizing lowpass, bandpass and highpass current responses simultaneously. The bandstop and allpass responses can also be obtained by connecting appropriate output currents directly without additional devices. The proposed filter is capable of providing an independent current-control of the natural angular frequency (ω<inf>o</inf>) and quality factor (Q) through the transconductance of the ZC-CFTA. Moreover, high-Q value filter can be realized by simply tuning the ratio of ZC-CFTA's transconductance. To support the theoretical results, the properties of the presented filter using CMOS ZC-CFTA have been verified by simulation results.
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    Current-mode KHN biquad filter using modified CFTAs and grounded capacitors
    (2011-07-26)
    Satansup, Jetsdaporn
    ;
    Pukkalanun, Tattaya
    ;
    Tangsrirat, Worapong
    In this paper, a current-mode Kerwin-Huelsman-Newcomb (KHN) filter structure employing four modified current follower transconductance amplifiers (MCFTAs) and two grounded capacitors is proposed. The circuit structure has one low-impedance current input and three high-impedance current outputs, and enables realizing lowpass, bandpass and highpass current responses simultaneously. The bandstop and allpass responses can also be obtained by connecting appropriate output currents directly without additional devices. The proposed filter is capable of providing an independent current-control of the natural angular frequency (ω<inf>0</inf>) and quality factor (Q) through the transconductance of the MCFTA. Moreover, high-Q value filter can be realized by simply tuning the ratio of MCFTA's transconductance. To support the theoretical results, the properties of the presented filter have been verified by simulation results.