KMITL

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

Browse

Settings

Author: search.filters.author.Channumsin, OrapinSubject: search.filters.subject.Electronically tunable

Search Results

Now showing 1 - 5 of 5
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Voltage differencing gain amplifier-based sinusoidal quadrature oscillator using only two grounded capacitors
    (2019-01-01)
    Channumsin, Orapin
    ;
    Tangsrirat, Worapong
    Background: This article describes the circuit construction of the sinusoidal quadrature oscillator using two Voltage Differencing Gain Amplifiers (VDGAs) as active devices. Methods: Since the presented oscillator circuit uses only two external grounded capacitors as pas-sive elements, it is quite suitable for monolithic integration point of view. The condition of oscilla-tion and the frequency of oscillation are non-interactive, and can be controlled electronically by tun-ing two separate biasing currents. Non-ideal analysis and sensitivity performance are also discussed. Results: The feasibility of the designed oscillator is justified by the PSPICE simulation results based on TSMC 0.35-µm CMOS process parameters. Conclusion: The effects of the VDGA non-idealities on the proposed circuit are also provided, and the computer simulations based on TSMC 0.35-mm CMOS model parameters are included to evalu-ate the performance of the circuit.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Dual-mode multifunction filter using VDGAs
    (2018-07-02)
    Channumsin, Orapin
    ;
    Tangsrirat, Worapong
    An electronically controllable resistorless dual-mode multifunction filter applying two voltage differencing gain amplifier (VDGA) and three external capacitors is presented. The displayed circuit can perform either voltage-mode filter or current-mode filter from the same structure. The circuit demonstrates the ensuing advantageous features: (i) simultaneous realization of highpass (HP), bandpass (BP) and lowpass (LP) filter functions, (ii) no requirement for element matching constraints, (iii) electronic tuning of its major parameters, (iv) low sensitivity performance. The simulation results affirm the workability of the presented circuit.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Single vdta-based three-input singleoutput universal filter
    (2017-02-01)
    Channumsin, Orapin
    ;
    Tangsrirat, Worapong
    A voltage-mode universal biquadratic filter with three input terminals and a single output terminal is presented which comprises of only one voltage differencing transconductance amplifier (VDTA), one grounded resistor and two capacitors. It employs a canonical number of active and passive elements, and can simultaneously realize lowpass, bandpass, highpass, bandstop and allpass responses with interconnection of relevant input voltages. The presented filter configuration also has low active and passive component sensitivities along with orthogonally adjustable natural angular frequency (ωo ) and the quality factor (Q). Simulation results which are accomplished with PSPICE program confirm the theory.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Compact electronically tunable quadrature oscillator using single voltage differencing gain amplifier (VDGA) and all grounded passive elements
    (2017-01-01)
    Channumsin, Orapin
    ;
    Tangsrirat, Worapong
    This work deals with the design of a compact electronically tunable sinusoidal quadrature oscillator. The proposed quadrature oscillator is designed with a single voltage differencing gain amplifier (VDGA) and all the three grounded passive elements. Its oscillation condition and oscillation frequency can be tuned independently by means of the VDGA transconductance gains. The proposed oscillator also provides the explicit quadrature voltage outputs of almost equal magnitude and low active and passive sensitivity figures. The performance of the oscillator has been demonstrated by PSPICE simulations based on TSMC 0.35-μm CMOS technology.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Floating capacitance multiplier circuit using full-balanced voltage differencing buffered amplifiers (FB-VDBAs)
    (2016-01-01)
    Pimpol, Jirapun
    ;
    Channumsin, Orapin
    ;
    Tangsrirat, Worapong
    This paper presents the resistor-less realization of a floating capacitance multiplier circuit using full-balanced voltage diffrencing buffered amplifiers (FB-VDBAs) as active components. The presented capacitance simulator contains only two FB-VDBAs together with a single grounded capacitor without any passive resistors. The equivalent capacitance value of the realized capacitance simulator can be tuned electronically by controlling the transconductance values of the FB-VDBAs. Anapplicatlon of the proposed tunable capacitance multiplier in realizing the RLC bandpass filter is also. Simulations by PSPICE program for standard 0.35-pm BICMOS process parameter shave been provided to verify the theory.