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Tunable Elliptic High-pass Filter based on Differentiator Approach
(2020-09-23)
Wongprommoon, Natapong
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Pienpichayapong, Peradol
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Prommee, Pipat
This article presents a design of high-order Elliptic ladder high-pass filter based on differentiators and integrator approach. Since the design of general Elliptic high-pass filter can be realized with high complexity, moreover the high-pass filter held very complicated design. The differentiators and integrator are deployed for synthesis high-pass filter from its Signal Flow Graph (SFG). The Elliptic RLC high-pass filter is transformed by using the original Elliptic RLC low-pass filter. The SFG is straightforward analyzed from the Elliptic RLC high-pass filter prototype. The SFG describes three differentiators and one integrator. The operational transconductance amplifiers (OTA) and grounded capacitors are preferred to implement the differentiators and integrator. The proposed filter contains only 7 OTAs with 4 grounded capacitors. The frequency responses can be varied between 100kHz and 10MHz by manipulating the bias current (IB) from 1μA to 100μA. The performances and the capability are carried out by using PSpice simulation which agreed to the theory.
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Low-voltage low-pass and band-pass elliptic filters based on log-domain approach suitable for biosensors
(2019-12-02)
Prommee, Pipat
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Wongprommoon, Natapong
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Kumngern, Montree
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Jaikla, Winai
This research proposes bipolar junction transistor (BJT)-based log-domain high-order elliptic ladder low-pass (LPF) and band-pass filters (BPF) using a lossless differentiator and lossless and lossy integrators. The log-domain lossless differentiator was realized by using seven BJTs and one grounded capacitor, the lossy integrator using five BJTs and one grounded capacitor, and the lossless integrator using seven BJTs and one grounded capacitor. The simplified signal flow graph (SFG) of the elliptic ladder LPF consisted of two lossy integrators, one lossless integrator, and one lossless differentiator, while that of the elliptic ladder BPF contained two lossy integrators, five lossless integrators, and one lossless differentiator. Log-domain cells were directly incorporated into the simplified SFGs. Simulations were carried out using PSpice with transistor array HFA3127. The proposed filters are operable in a low-voltage environment and are suitable for mobile equipment and further integration. The log-domain principle enables the frequency responses of the filters to be electronically tunable between 10k Hz–10 MHz. The proposed filters are applicable for low-frequency biosensors by reconfiguring certain capacitors. The filters can efficiently remove low-frequency noise and random noise in the electrocardiogram (ECG) signal.
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Simple structure OTA-C elliptic band-pass filter
(2019-07-01)
Prommee, Pipat
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Wongprommoon, Natapong
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Khateb, Fabian
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Manositthichai, Narongsak
This paper presents a new Elliptic ladder bandpass (BP) filter based on MO-OTA. This RLC ladder low-pass (LP) prototype and network transformation are used to create the band-pass signal flow graph (SFG). From SFG, the integrators and differentiator are required to realize the BP Elliptic filter with low-complexity configuration. The integrator and differentiator circuits can generally be obtained based on OTA-C technique. Lossy and lossless integrators and differentiators based on MO-OTA(s) are straight-forward applied to SFG for achieving the designed filter. Based on this technique, the circuit is obviously apparent that the final circuit has low-complexity and low-component count compared with the conventional technique. This proposed BP Elliptic filter contains only 10 bipolar MO-OTAs and 8 grounded capacitors. The frequency responses can be tuned between 2kHz and 100kHz through the bias currents of OTA. The simulation results are carried out by PSpice and agreed well with theory anticipation.
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OTA-C based compact Low-pass Elliptic Filter
(2018-12-24)
Wongprommoon, Natapong
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Manositthichai, Narongsak
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Prommee, Pipat
This article described a compact structure simulating electronically controlled high-order Elliptic filter based on OTA-C. The signal flow graph (SFG) is deployed as a synthesis method from RLC prototype. The synthesis of Elliptic filter using SFG is normally required the integrators and very low current/voltage gain. This proposed filter is synthesized by using SFG and no required any current/voltage gains. From its SFG, the OTA-C based integrators and differentiators can be realized. The completed circuit is using only grounded capacitors with low-complexity structure. The frequency response of proposed filter can be tuned through the equality of OTA's bias currents. The supply voltage is using ±. The comparison of proposed filter and RLC prototype characteristics are verified by PSpice that the results are in good agreement.
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Electronically tunable MOS-only current-mode high-order band-pass filters
(2017-01-01)
Prommee, Pipat
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Tiamsuphat, Aphinat
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Taher Abuelma'Atti, Muhammad
This paper presents new CMOS current-mode ladder Chebyshev and elliptic band-pass filters (BPFs). The signal flow graph and the network transformation methods are used to synthesize the proposed BPFs by using Chebyshev and elliptic RLC low-pass prototypes. CMOS-based lossy and lossless integrators with grounded capacitors are used to synthesize the proposed BPFs. The proposed filters can be electronically tuned between 10 kHz and 100 MHz by adjusting the bias current from 0.02 A to 200 A. Both filters use a 1.5 V DC power supply, which leads to low dynamic power consumption. Both filters enjoy total harmonic distortion of less than 1.5% along the range of the tuning bias currents. Simulation results are included to illustrate the functionality of the proposed filters.
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Realization of tunable elliptic low-pass filter based on CCCIIs
(2016-03-11)
Kunto, Terdsak
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Prommee, Pipat
This article presents a realization of electronically tunable current-mode Elliptic ladder low-pass filter using CCCIIs. The passive RLC ladder filters prototype and signal flow graph method (SFG) are employed for synthesis. The CCCII-based lossy, lossless integrators and current attenuator are required for the circuit realization. The proposed filter circuit can be electronically tuned between 1 kHz and 1 MHz through bias current from 0.05μA to 50μA. The proposed filter use ±1.5V power supply with 6 mW power consumption at 50 μA bias current. The proposed filter uses grounded capacitors without external resistors which is suitable for further integration. The total harmonic distortion (THD) of the low-pass filters is less than 0.5% over the operating frequency range. PSPICE simulation results are carried out, obtained by using BJT model parameter of HFA 3046, confirm the presented theory.
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CMOS-based current-mode tunable ladder Elliptic low-pass filter
(2015-10-09)
Prommee, Pipat
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Kunto, Terdsak
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Somdunyakanok, Montri
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Prommee, Tanakrit
This paper presents a tunable CMOS-based third-order low-pass filter that can be operated in high frequency. The proposed low pass filter is designed based on Elliptic Ladder low-pass filter prototype. The proposed filter structure is constructed by using two lossy integrators and a lossless integrator. The proposed filter comprises only 18 transistors. The frequency responses of low-pass filter can be electronically tuned between 10kHz and 100MHz through bias current from 0.01 μA to 100 μA. The circuit used 1.5 V power supply with 3mW power consumption at 100 μA bias current. Using of the grounded capacitors which is suitable for further integration. THD of low-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 technology.
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Electronically tunable current-mode high-order ladder low-pass filters based on CMOS technology
(2015-01-01)
Kunto, Terdsak
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Prommee, Pipat
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Abuelma'atti, Muhammad Taher
This paper describes the design of current mode low-pass ladder filters based on CMOS technology. The filters are derived from passive RLC ladder filter prototypes using new CMOS lossy and lossless integrators. The all-pole and Elliptic approximations are used in the proposed low-pass filter realizations. The proposed two types of filter can be electronically tuned between 10 kHz and 100 MHz through bias current from 0.03 μA to 300 μA. The proposed filters use 1.5 V power supply with 3 mW power consumption at 300 μA bias current. The proposed filters are resistorless, use grounded capacitors and are suitable for further integration. The total harmonic distortion (THD) of the low-pass filters is less than 1% over the operating frequency range. PSPICE simulation results, obtained by using TSMC 0.18μm technology, confirm the presented theory.
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Electronically tunable voltage-mode Elliptic third-order ladder low-pass filter using simple OTA
(2014-01-27)
Tiamsuphat, Aphinat
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Prommee, Pipat
This paper presents Elliptic third-order voltage-mode ladder low-pass filter based on CMOS technology, Using OTA. Third-order low pass filter is designed based on RLC Elliptic Ladder low-pass filter prototype. The proposed filter contains lossless integrators and voltage gains. The frequency responses of low-pass filter can be electronically tuned between around 3kHz and 2MHz by adjusting bias current from 0.01μA to 10μA with 1mW of dynamic power consumption along the tuning range. The circuit used ±1.5V power supply and used of ground capacitors which suit to integrated circuit. THD of low-pass filter can be obtained less than 0.7% along the operating frequencies. PSPICE simulation results are carried out to confirm the theory by using TSMC 0.18μm CMOS technology.
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OTA-based electronically tunable elliptic high-order current-mode ladder band-pass filter
(2014-01-27)
Wongprommoon, Natapong
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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.

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