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Author: search.filters.author.Khateb, FabianSubject: search.filters.subject.Analog circuit

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    Extremely low-voltage low-power differential difference current conveyor using multiple-input bulk-driven technique
    (2020-08-01)
    Kumngern, Montree
    ;
    Khateb, Fabian
    ;
    Kulej, Tomasz
    In this paper, a new differential difference current conveyor (DDCC) with ultra-low voltage and low-power capability is presented. The DDCC is designed by using a non-tailed differential pair with multiple-input bulk-driven MOS transistor technique to obtain a rail-to-rail input common-mode swing and extremely low supply voltage. The MOS transistors biased in the sub-threshold region have been used to achieve extremely low power consumption. The performance of the proposed DDCC is evaluated by simulation results using SPICE program and MOS transistors parameters provided by a standard n-well 0.18 µm CMOS process from TSMC. A rail-to-rail input common-mode range was shown and a high accuracy was expressed. The bandwidth was 2.2 kHz and the total harmonic distortion was 1% for an input signal with amplitude of 240 mV<inf>p-p</inf>, obtained at supply voltage of 0.3 V and power dissipation of 28.6 nW. The proposed DDCC has been used to realize a sixth-order low-pass filter for application to electrocardiogram (ECG) applications.
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    0.5 V fully differential universal filter based on multiple input OTAs
    (2020-01-01)
    Jaikla, Winai
    ;
    Khateb, Fabian
    ;
    Kumngern, Montree
    ;
    Kulej, Tomasz
    ;
    Ranjan, Rajeev Kumar
    The design of a low-power, low-voltage, fully-differential universal biquad filter is presented in this work, which is constructed from four multiple-input gate-driven operational transconductance amplifiers (MI-OTAs) along with one passive resistor and two passive capacitors. The scheme of presented biquad filter has three high-input impedance voltage nodes and single output voltage node. Five unity gain filtering functions, all-pass (AP), low-pass (LP), band-pass (BP), high-pass (HP) and band-stop (BS) responses, are obtained. The selection of output filtering responses is obtained without the need of component matching condition, inverting or double input voltage. With this feature, it can be easily controlled with digital programming. The quality factor (Q) and angular frequency (ω<inf>0</inf>) are electronically and independently tuned. Moreover, the adjustment of ω<inf>0</inf> and Q can be done without affecting the voltage gain. A workability of the design is confirmed via Cadence software and the Spectre simulator based on the 180 nm TSMC CMOS technology parameters. The proposed fully differential filter operates with 0.5 V supply voltage. The results verify that the proposed filter dissipates the total power of 53.3 nW. Additionally, the dynamic range (DR) of band-pass filtering function is 63 dB for 2% third intermodulation distortion (IMD). Also, the simulated RMS value of the band-pass filtering noise is 45 µV.
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    Bulk-driven fully balanced second-generation current conveyor in 0.18 µm CMOS
    (2019-05-01)
    Kumngern, Montree
    ;
    Khateb, Fabian
    ;
    Kulej, Tomasz
    This paper presents an ultra-low-voltage and low-power fully balanced second-generation current conveyor (FBCCII) which is suitable for applications in ultra-low-voltage and low-power analog circuits. To confirm the attractive features of proposed FBCCII, the analog circuits such as fully digital programmable voltage gain amplifier, fully all-pass sections, fully band-pass filter and fully universal filter using the proposed FBCCII as active element have been proposed. The performances of the proposed FBCCII and its applications can be depicted through simulation results using SPICE simulations and 0.18 µm n-well CMOS process from TSMC with a 0.5 V supply.
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    Five-inputs single-output voltage mode universal filter with high input and low output impedance using VDDDAs
    (2017-01-01)
    Sangyaem, Surasak
    ;
    Siripongdee, Surapong
    ;
    Jaikla, Winai
    ;
    Khateb, Fabian
    The design of analog filter using active building block has been gained significant attention and has become an interesting research topic. A five-inputs single −output voltage-mode universal biquadratic filter using active building block, namely voltage differencing differential difference amplifier (VDDDA) is presented in this paper. The proposed filter consists of two VDDDAs and two grounded capacitors. The presented circuit has high impedance for all input voltage nodes and low impedance for output voltage node which is ideal for cascade in voltage-mode circuit without the use of buffer circuits. It can provide five output voltage functions which are band-pass (BP), low-pass (LP), band-reject (BR), high-pass (HP) and all-pass (AP) responses. For high-pass and band-pass functions, the inverting and non-inverting response can be achieved. The matching condition, the inverting and double gain amplifier are not required which is easy to select the output response by digital method. The natural frequency and quality factor can be electronically tuned that is attractive for microcomputer or microcontroller controllability. To verify the validity of proposed filter, the PSPICE simulation and experimental results using VDDDA constructed from commercially available IC are included. The measured results agree well with theoretical expect.
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    Electronically tunable current-mode biquad filter employing CCCDTAs and grounded capacitors with low input and high output impedance
    (2013-12-01)
    Jaikla, Winai
    ;
    Khateb, Fabian
    ;
    Siripongdee, Surapong
    ;
    Supavarasuwat, Piya
    ;
    Suwanjan, Peerawut
    In this study, a single-input multiple-outputs current-mode analog biquadratic filter, based on current controlled current differencing transconductance amplifier (CCCDTA) is presented. The proposed filter uses two CCCDTAs and two grounded capacitors without any external resistors, which is well suited for integrated circuit implementation. The filter simultaneously gives 3 standard transfer functions, namely, lowpass, highpass and bandpass filters with independent control of quality factor and pole frequency by electronic method. By summing of I<inf>HP</inf> and L<inf>LP</inf>, the notch filter can be also achieved. Moreover, the circuit has low input and high output impedance which would be an ideal choice for cascading in current-mode circuit. The PSPICE simulation results are included verifying the workability of the proposed filter. The given results agree well with the theoretical anticipation. © 2013 Elsevier GmbH.