KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Author: search.filters.author.Wongprommoon, NatapongSubject: search.filters.subject.OTA-C

Search Results

Now showing 1 - 3 of 3
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Low-complexity Chebyshev High-pass Filter based on OTA-C
    (2020-07-01)
    Wongprommoon, Natapong
    ;
    Tiamsuphat, Apinat
    ;
    Prommee, Pipat
    This work presents a new Chebyshev ladder high-pass filter based on operational transconductance amplifier (OTA) based differentiators. Lossy and Lossless differentiators based on the OTA-C technique are deployed as the main sub-circuits. The Chebyshev ladder high-pass filter is transformed from a low-pass RLC prototype by using the network transformation method. The signal flow graph (SFG) and third-order RLC prototype are used to synthesis the active high-pass filter. The final SFG functions can be directly replaced by OTA-C current-mode differentiators. Due to the proposed structure of the high-pass filter contains only 6 OTA(s) and 3 grounded capacitors that resulting in the low-complexity and low components count. The frequency responses of the proposed filter can be electronically tuned between 200kHz and 8MHz by varying the bias currents (IB) from 3 μ A to 300 μ A. The proposed filter response good agreement with the response of the RLC prototype. PSpice simulation results are carried out to verify the filter performances.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Realization of Tunable Fractional-order Device based on Ladder Network Approximation
    (2020-06-01)
    Prommee, Pipat
    ;
    Pienpichayapong, Peradol
    ;
    Manositthichai, Narongsak
    ;
    Wongprommoon, Natapong
    This paper describes a design and realization of a fractional-order device or constant phase element (CPE) using the approximation method. The rational function is applied for the fractional-order function. The rational function can be rewritten in the continue fraction expansions (CFE) form. The Cauer network type is realized from the CFE as RC ladder network. The signal flow graph (SFG) method is preferred to realize the active network from the passive RC ladder network. The finalized CPE requires the gains and integrators in voltage-mode. The OTAs are deployed as tunable active devices with grounded capacitors to realize the tunable fractional-order device. From the design procedure, the proposed CPE can be constructed in arbitrarily order and frequency operation. Moreover, the tunable of magnitude and frequency operation can be electronically tuned. The good agreement results of proposed CPE are carried out by PSpice compared to the theoretical expectation.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    OTA-based electronically tunable elliptic high-order current-mode ladder band-pass filter
    (2014-01-27)
    Wongprommoon, Natapong
    ;
    Prommee, Pipat
    This paper presents Elliptic high-order currentmode ladder band-pass filter based on OTA-C that can be operated in high frequency. High-order band pass filter is designed based on Elliptic Ladder band-pass filter prototype. The proposed filter contains lossy and lossless integrators. The frequency responses of band-pass filter can be electronically tuned between around 100kHz and 10MHz by adjusting bias current form 0.15 μA to 1500 μA with 7.74mW of dynamic power consumption along tuning the bias current. The circuit used 1.5 V power supply and used of ground capacitors which suit to integrated circuit. THD of band-pass filter can be obtained less than 1% along the operating frequencies. PSPICE simulation results are carried out to confirm the theory by using TSMC 0.18μm CMOS technology.