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Author: search.filters.author.Khateb, FabianSubject: search.filters.subject.Operational transconductance amplifier (OTA)

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    31.3 nW, 0.5 V Bulk-Driven OTA for Biosignal Processing
    (2023-01-01)
    Kumngern, Montree
    ;
    Kulej, Tomasz
    ;
    Khateb, Fabian
    This paper presents a new extremely low-voltage low-power bulk-driven (BD) operational transconductance amplifier (OTA) realized for low frequency biosignal processing. The CMOS structure of the OTA utilizes bulk-driven and self-cascode techniques in the subthreshold region, supporting the operation with the supply voltage ( V- DD ) as the threshold voltage ( VTH ) of a single MOS transistor, i.e., V DD = V TH = 0.5 V, while offering nano power consumption (31.3 nW for 15 nA nominal setting current). Using the extremely low-voltage and low-power OTA in biosignal processing enables extending the lifetime of applications that are powered by battery or energy harvesting sources. The OTA has a 54.7 dB low frequency gain, 6.18 kHz gain bandwidth and 75° phase margin at 15 pF load capacitance. The proposed OTA has been used to realize a bandpass filter (BPF) with adjustable gain for electrocardiogram (ECG) signal processing. The higher cutoff frequency of the BPF is adjustable electronically by a setting current and the BPF's gain can be adjusted by capacitors value. The total harmonic distortion (THD) of the BPF is -53.56 dB, the input integrated input-referred voltage noise is 17.9 V rms , the common mode rejection ratio (CMRR) is 75 dB and the power supply rejection ratio (PSRR) is 87.7 dB. The BPF was designed in the Cadence program using 0.18 m CMOS technology from TSMC. The simulation results agree with the presented theory.
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    0.5-V High Linear and Wide Tunable OTA for Biomedical Applications
    (2021-01-01)
    Khateb, Fabian
    ;
    Kulej, Tomasz
    ;
    Akbari, Meysam
    ;
    Kumngern, Montree
    This paper presents a low-voltage nano-power multiple-input operational transconductance amplifier (MI-OTA) with high linearity performance and increased input voltage swing. The enhanced performances are achieved thanks to employing several techniques as the bulk-driven, source-degeneration, self-cascode and negative conductance along with the concept of the input signal attenuation formed by multiple-input MOS transistor. The MI-OTA is widely tunable that serves for biological signals processing. A 3rd-order Butterworth band-pass filter (BPF) for electrocardiogram (ECG) signal processing with 55.8 dB dynamic rang is presented. The MI-OTA circuit is designed for 0.5V voltage supply and offers a 0.22% total harmonic distortion (THD) for 0.2Vpp input signal with total power consumption of 13.4nW. Extensive simulation results including Monte Carlo analysis and process, voltage, temperature (PVT) corners using the 0.18 μm CMOS technology from TSMC confirm the characteristics of the proposed MI-OTA and the filter.