Sra-Ium, Napat

Loading...
Thumbnail Image
Preferred name
Sra-Ium, Napat
Alternative Name
Sra-ium, Napat
Sra-ium, N.
Main Affiliation
Email
napat.sr@kmitl.ac.th

Settings

Now showing 1 - 2 of 2
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Minimal Realization Plus Current Output CC-based Biquad Circuit
    (2024-06-01)
    Wisetphanichkij, Sompong
    ;
    Angkeaw, Krit
    ;
    Sra-Ium, Napat
    This paper presents a minimal design of a biquad circuit using only one plus current output type-II current conveyor (CCII), one differential voltage current conveyor (DVCC) and grounded passive components. The circuit enables the implementation of all 5 basic filter types: low-pass (LP), band-pass (BP), high-pass (HP), band-stop (BS) and all-pass (AP) by selecting and adding input and output currents with no component matching constraints. Moreover, the circuit parameters ω<inf>0</inf> and Q can be set simply by adjusting the circuit components. The proposed biquad circuit performance has very low sensitivity to circuit components due to its simple structure and a small number of devices (2 active and 4 grounded passive components). This allows the circuit to work at high frequencies. Non-ideal and parasitic effects are investigated and discussed. The performance of the proposed topology was evaluated through PSPICE simulator using the 0.18 μm CMOS technology from the Taiwan Semiconductor Manufacturing Company (TSMC).
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    High-frequency log-domain current-mode multiphase sinusoidal oscillator
    (2010-09-01)
    Prommee, P.
    ;
    Sra-ium, N.
    ;
    Dejhan, K.
    This study describes the design of a multiphase sinusoidal oscillator (MSO) based on log-domain filtering concept. The circuit is a direct realisation of a first-order differential equation for obtaining the inverting and non-inverting low-pass filters. Each low-pass filter comprises only a grounded capacitor and four transistors. The proposed MSO can be instantaneously controlled over a very wide frequency range by controlling the current for the oscillation frequency and oscillation condition which indicates the proposed MSO's suitability in high-frequency applications. A validated bipolar junction transistor (BJT) model is used in SPICE simulation operated from a single power supply as low as 2.5 V. The oscillation frequency is controlled over four decades of frequency. The total harmonic distortions for three phase (11.5 MHz) and four phase (7 MHz) are, respectively, obtained around 2.4 and 2.2% which enables them to be fully integrated in telecommunication systems. The power consumption is around 5.5 mW for 100 μA bias current. Moreover, experimental results of three-phase MSO are included. © 2010 The Institution of Engineering and Technology.