KMITL

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

Browse

Search Results

Now showing 1 - 10 of 19

Some of the metrics are blocked by your
consent settings
SITO current-mode multifunction biquad using readily available IC LT1228s
(2020-07-01)
Roongmuanpha, Natchanai
;
Tangsrirat, Worapong
This paper focuses on the practical realization of current-mode multifunction biquadratic filter with single input and triple outputs (SITO), implementing from two readily available IC LT1228s. Only three grounded passive elements have been used for the realization. Highpass (HP), bandpass (BP) and lowpass (LP) biquadratic filtering functions are simultaneously generated without modifying the circuit structure. The tuning laws of the natural angular frequency (ωo) and the quality factor (Q) are non-interactive electronic control by changing the external bias current of LT1228s. The critical circuit sensitivities are considered to be low. Computer simulations with PSPICE program are also confirmed with theoretical ones and used to demonstrate the circuit performance.
Some of the metrics are blocked by your
consent settings
Linearly Tunable CMOS Voltage Differencing Transconductance Amplifier (VDTA)
(2019-06-01)
Tangsrirat, Worapong
This paper proposes an alternative way to implement a linearly tunable CMOS voltage differencing transconductance amplifier (VDTA). It has been designed by using the floating current source (FCS) and the current squaring circuit. The circuit achieves its linear tunability by squaring the long-tail biasing current of the FCS. In this way, the transconductance gains of the proposed CMOS VDTA can be varied linearly through adjusting the DC bias currents. As an application example, the proposed VDTA is used in the design of an actively tunable voltage-mode multifunction filter. The derived filter possesses the following desirable properties: simultaneous realization of three standard filter functions; employment of only two grounded capacitors; and electronic tunability of the natural angular frequency and the quality factor. The performance of the proposed circuit and its filter design application were examined by PSPICE simulations with TSMC 0.25-mm CMOS real process technology.
Some of the metrics are blocked by your
consent settings
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.
Some of the metrics are blocked by your
consent settings
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.
Some of the metrics are blocked by your
consent settings
Three-input single-output current-mode biquadratic filter with high-output impedance using a single current follower transconductance amplifier
(2017-08-01)
Mongkolwai, Pratya
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
The circuit configuration for realizing a canonical current-mode biquad filter with three inputs and single output is introduced. The introduced filter employs a single current follower transconductance amplifier (CFTA) and a minimum of passive components, i.e., one resistor and two grounded capacitors. It is capable of generating all the five standard biquadratic filtering functions and suitable for current-mode cascading by possessing high-output impedance. Also, the proposed filter can be tuned electronically by an external bias current of the CFTA. The circuit is analyzed for the non-idealities of the used CFTA and possesses attractive low sensitivity performance. PSPICE simulation results are found to be in good agreement with the presented theory.
Some of the metrics are blocked by your
consent settings
Compact quadrature oscillator with voltage and current outputs using only single VDTA and grounded capacitors
(2017-04-01)
Tangsrirat, Worapong
A possible design of the compact sinusoidal quadrature oscillator using single voltage differencing transconductance amplifier (VDTA) and only two grounded capacitors has been presented. The presented quadrature oscillator provides the following attractive properties: (i) canonic form and resistor less structure; (ii) availability of the explicit quadrature voltage outputs and current outputs; (iii) electronic controllability of the oscillation frequency (Ω<inf>0</inf>); and (iv) low active and passive sensitivities. To support the validity of the oscillator, PSPICE simulation results have also been provided.
Some of the metrics are blocked by your
consent settings
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.
Some of the metrics are blocked by your
consent settings
Insensitive High-Output Impedance Current-Mode Biquad with a Single Current Follower Transconductance Amplifier
(2017-01-01)
Mongkolwai, Pratya
;
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
The circuit configuration for realizing a canonical current-mode biquad filter with three inputs and one output is introduced. The introduced filter employs a single current follower transconductance amplifier (CFTA) and a minimum of passive components, i.e., one resistor and two grounded capacitors. It is capable of generating all the five standard biquadratic filtering functions and suitable for current-mode cascading by possessing high-output impedance. Also, the proposed filter can be tuned electronically by an external bias current of the CFTA. The circuit is analyzed for the non-idealities of the used CFTA and possesses attractive low sensitivity performance. PSPICE simulation results are found to be in good agreement with the presented theory.
Some of the metrics are blocked by your
consent settings
Electronically Controllable Resistorless Dual-Mode Multifunction Filter
(2017-01-01)
Mongkolwai, Pratya
;
Tangsrirat, Worapong
A circuit topology using two compact tunable transconductance cells (G<inf>m</inf>-cells) and three capacitors is presented for realization of an electronically tunable resistorless dual-mode multifunction filter. The presented multifunction filter can operate either in voltage-mode or current-mode, and can realize the highpass, bandpass and lowpass filter responses simultaneously. The filter parameters, i.e. the natural angular frequency (<inf>o</inf>) and the quality factor (Q), are electronically controllable by means of the transconductance gains. No element matching constraints are necessary, and the active and passive component sensitivities are low. PSPICE simulation results based on TSMC 0.25-m CMOS real process agree closely with the theoretical calculations.
Some of the metrics are blocked by your
consent settings
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.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results