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Author: search.filters.author.Kumngern, MontreeSubject: 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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    0.4 V fully differential current conveyor using multiple-input bulk-driven MOST technique
    (2019-08-01)
    Kumngern, Montree
    This paper presents a new ultra-low voltage ultra-low power fully differential current conveyor (FDCCII) which is suitable for extremely low-voltage low-power analog signal circuit applications. Thanks to multiple-input bulk-driven MOS transistor technique, the proposed structure employs two differential pairs which offer low complexity and low power consumption. The bulk-driven MOS technique based circuit also provides rail-to-rail input common-mode range of proposed circuit. To prove the workability of the proposed FDCCII, the circuit has been used to realize summing/subtracting amplifier as design examples. The performances of the proposed FDCCII and design examples are demonstrated through PSPICE simulations using a 0.18 μm TSMC n-well CMOS process with 0.4 V supply voltage.
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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.