A Single-Ended and Fully-Differential Universal Current-Mode Frequency Filter with MO-CF and DACA Elements

Langhammer, Lukáš; Jeřábek, Jan; Polák, Josef; Panek, Daria

doi:10.4316/aece.2016.03007

Cited by 2 publications

(7 citation statements)

References 15 publications

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“…The dual-output ACA (ACA4 in filter topology) was implemented on PCB by DACA (Digitally Adjustable Current Amplifier) chip. The current gain B of the DACA is controlled by 3-bit word in range from 1 to 8 with step 1 [20], [21]. Both these chips were developed at Department of Telecommunications of the Brno University of Technology in cooperation with ON Semiconductor.…”

Section: Measurement and Simulation Resultsmentioning

confidence: 99%

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Multifunctional Electronically Reconfigurable and Tunable Fractional-Order Filter

Dvořák¹,

Jeřábek²,

Polesakova³

et al. 2019

ElAEE

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In this paper the authors present a multifunctional reconfigurable fractional-order filter performing a low-pass, high-pass, band-pass and band-reject transfer function. The filter is based on two types of active elements, OTA (Operational Transconductance Amplifier) and ACA (Adjustable Current Amplifier). It provides pole frequency control, depending on the values of the transconductance of the OTA elements. The quality factor is also electronically controlled, depending on the amplification of the ACA element. The order of the filter can be changed by switching the fractional-order capacitor having various values of the order. The circuit was implemented as a PCB (Printed Circuit Board) and measured in laboratory conditions. Measurement results are compared with the simulation results. The behavioural models were used for the purpose of the simulation.

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Section: Measurement and Simulation Resultsmentioning

confidence: 99%

“…Operation of Adjustable Current Amplifier (ACA) is described by the following equations: IOUT = BIIN, where parameter B is controllable current gain of the ACA [20], [21]. If necessary, the number of the current outputs of the ACA active element can be easily expanded (as in case of ACA4 in Fig.…”

Section: Design Of the Circuitmentioning

confidence: 99%

Multifunctional Electronically Reconfigurable and Tunable Fractional-Order Filter

Dvořák¹,

Jeřábek²,

Polesakova³

et al. 2019

ElAEE

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“…This way of adjustment is used very often also in further solutions. More advanced devices were proposed in [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ] for example. They offer interesting features discussed in detail in Table 1 Work [ 8 ] presents current amplifier feature allowing gain setting by ratio of resistors (no electronic adjustment is shown).…”

Section: Introductionmentioning

confidence: 99%

“…Table 1 shows that the majority of solutions is based on bipolar junction transistors, exploiting the benefit of exponential characteristics specially in the accurate current multipliers discussed below. These bipolar topologies meet well the requirements for the exact functionality, good dynamic range and speed (commonly in tens of MHz and more), but at the cost of a large area and current consumption (standardly not mentioned), which is no longer acceptable in the small CMOS technologies [ 3 , 4 , 7 , 9 , 10 , 11 , 12 , 16 , 17 ]. A large number of previous concepts (CMOS especially) was not tested experimentally, mostly just simple simulation results are shown (without modeling of real effects in many cases) [ 5 , 6 , 7 , 8 , 10 , 11 , 13 , 14 , 15 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

“…Special cases are the solutions presented in [ 7 , 15 ]. However, the adjustability of any parameter, but especially the gain, can be often welcomed for electronic tuning of applications in many cases [ 12 , 13 , 16 , 17 ]. The output impedance of current output circuits is the most significant issue because of the parasitic behavior occurring in high-impedance nodes of applications (typically in active filters [ 9 ]).…”

Section: Introductionmentioning

confidence: 99%

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The CMOS Highly Linear Current Amplifier with Current Controlled Gain for Sensor Measurement Applications

Prokop

Šotner

Kledrowetz

2020

Sensors

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This paper introduces a new current-controlled current-amplifier suitable for precise measurement applications. This amplifier was developed with strong emphasis on linearity leading to low total harmonic distortion (THD) of the output signal, and on linearity of the gain control. The presented circuit is characterized by low input and high output impedances. Current consumption is significantly smaller than with conventional quadratic current multipliers and is comparable in order to the maximum processed input current, which is ±200 µA. This circuit is supposed to be used in many sensor applications, as well as a precise current multiplier for general analog current signal processing. The presented amplifier (current multiplier) was designed by an uncommon topology based on linear sub-blocks using MOS transistors working in their linear region. The described circuit was designed and fabricated in a C035 I3T25 0.35-µm ON Semiconductor process because of the demand of the intended application for higher supply voltage. Nevertheless, the topology is suitable also for modern smaller CMOS technologies and lower supply voltages. The performance of the circuit was verified by laboratory measurement with parameters comparable to the Cadence simulation results and presented here.

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A Single-Ended and Fully-Differential Universal Current-Mode Frequency Filter with MO-CF and DACA Elements

Cited by 2 publications

References 15 publications

Multifunctional Electronically Reconfigurable and Tunable Fractional-Order Filter

Multifunctional Electronically Reconfigurable and Tunable Fractional-Order Filter

The CMOS Highly Linear Current Amplifier with Current Controlled Gain for Sensor Measurement Applications

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