A first-order universal filter including a grounded capacitor and two CFOAs

Dogan, Mehmet; Yüce, Erkan

doi:10.1007/s10470-022-02021-2

Cited by 17 publications

(20 citation statements)

References 30 publications

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“…It should be noted that the universal first-order filter is an interesting topic for publications because many papers on this topic were published in a few years ago [28][29][30][31][32][33][34]. Considering the mode of operations, these first-order filters can be classified as voltage-mode (VM) filters [6][7][8][9][10][11][12][13][14], current-mode (CM) filters [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], and mixed-mode (MM) filters [31][32][33][34]. This work is focused on CM filters that should provide low-input and high-output impedances, which is ideal for CM circuits because they can be connected to applications without buffer circuit requirements.…”

Section: Introductionmentioning

confidence: 99%

Current-Mode First-Order Versatile Filter Using Translinear Current Conveyors with Controlled Current Gain

et al. 2023

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This paper offers a new current-mode first-order versatile filter employing two translinear current conveyors with controlled current gain and one grounded capacitor. The proposed filter offers the following features: realization of first-order transfer functions of low-pass, high-pass, and all-pass current responses from single topology, availability of non-inverting and inverting transfer functions for all current responses, electronic control of current gain for all current responses, no requirement of component-matching conditions for realizing all current responses, low-input impedance and high-output impedance which are required for current-mode circuits, and electronic control of the pole frequency for all current responses. The proposed first-order versatile filter is used to realize a quadrature sinusoidal oscillator to confirm the advantage of the new topology. To confirm the functionality and workability of new circuits, the proposed circuit and its application are simulated by the SPICE program using transistor model process parameters NR100N (NPN) and PR100N (PNP) of bipolar arrays ALA400-CBIC-R from AT&T.

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Section: Introductionmentioning

confidence: 99%

Current-Mode First-Order Versatile Filter Using Translinear Current Conveyors with Controlled Current Gain

et al. 2023

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“…First‐order filters have a wide range of applications in various fields such as (i) control systems, where they are used to remove unwanted variations in the output of a system, such as in temperature and pressure control and also in the design of lead/lag compensators (ii) communication systems, where they are used to remove unwanted frequencies from a signal, such as in radio or telephone systems, (iii) power electronics systems, to smooth out pulsating DC power, such as in a rectifier, (iv) electronic systems, where they are used in the design of higher order filters, oscillators, and other circuits 1 . In the open literature, a number of first‐order universal filter configurations have been reported using several commercially available ICs such as op‐amp, current feedback amplifier, operational transconductance amplifier, LT1228, and other modern active building blocks (ABB) 2–50 A comparison table including various features of the previously reported first‐order universal filters employing various ABBs is tabulated in Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…4,5,8,14,20–22,24,33,34,43,47,49 More than three resistors are used in the circuits of Refs. 2,37,38,43,46 Independent controllability of gain and cutoff frequency is not available in the circuits presented in Refs. 2–24,27,40,42,43,48,49 Transadmittance mode (TAM) filters are only available in these circuits 11,15,42,44,50 …”

Section: Introductionmentioning

confidence: 99%

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Single‐differential difference current conveyor‐based first‐order VM/TAM universal filter and its applications

Raj,

Senani,

Bhaskar

2023

Int J Numerical Modelling

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A new first‐order universal filter structure is presented in this article using a single differential difference current conveyor (DDCC). The proposed circuit can provide three first‐order filter functions namely, high‐pass filter (HPF), low‐pass filter (LPF), and all‐pass filter (APF) in voltage mode (VM) and transadmittance mode (TAM) both. A voltage amplifier with a gain of 2 is required for the realization of the APF functions in both the modes while for LPF and HPF, no condition is required. The pole frequency and gain of the proposed circuit can be controlled separately. The effect of the parasitic impedances of the DDCC has been modeled in the nonideal equivalent circuit from which nonideal parameters have been evaluated and compared with their ideal ones. Application examples of the proposed circuits configured as amplitude equalizer (in both modes) and in the realization of a simple wideband band‐pass filter are also discussed. The functionality of the proposed circuit as well as its mentioned application circuits is verified using complementry metal oxide semiconductor DDCC to support the theoretical propositions. Some experimentally observed frequency responses and transient responses of the various VM filters have also been corroborated using DDCC implemented using AD844 ICs.

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“…A first-order universal filter realizes high-pass (HP), low-pass (LP), and AP configurations in the same circuit. A large part of technical documentation [4][5][6][7][8][9][10][11] is focused on single-ended first-order filters, due to their design simplicity and implementation. However, single-ended circuits have several drawbacks in a few specific ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

Fully Differential Current-Mode Configuration for the Realization of First-Order Filters with Ease of Cascadability

Kumar

Elkamchouchi

et al. 2022

Electronics

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It is well known that fully differential signal processing is more advantageous than single-ended signal processing in a noisy environment, and is widely used in audio, video and other signal processing applications. This paper introduces a new fully differential configuration that contains a first-order low-pass (LP) filter, high-pass (HP) filter, and all-pass (AP) filter, all present within the same circuit design. The proposed fully differential configuration is simple and employs only one multiple-output current differencing transconductance amplifier and one grounded capacitor. The circuit has a wide operating frequency range (up to 73 MHz). The additional features offered by the proposed circuit include use of the lowest number of active and passive components, suitability of the integrated circuit chip, support of cascadability, electronic tunability, no passive component-matching restrictions, availability of all first-order responses, i.e., LP, HP, and AP, and low-level operating supply voltages. Non-ideal and parasitic analyses are investigated for the proposed circuit, and PSPICE simulation results are presented to verify the proposed theory. Additionally, the proposed FD LP filter circuit is experimentally verified using off-the-shelf ICs. Moreover, the cascading feasibility is demonstrated by realizing a fully differential nth-order LP filter.

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A first-order universal filter including a grounded capacitor and two CFOAs

Cited by 17 publications

References 30 publications

Current-Mode First-Order Versatile Filter Using Translinear Current Conveyors with Controlled Current Gain

Current-Mode First-Order Versatile Filter Using Translinear Current Conveyors with Controlled Current Gain

Single‐differential difference current conveyor‐based first‐order VM/TAM universal filter and its applications

Fully Differential Current-Mode Configuration for the Realization of First-Order Filters with Ease of Cascadability

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