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New resistorless tunable voltage-mode universal filter using single VDIBA

Abstract

To increase the universality of the recently introduced voltage differencing inverting buffered amplifier (VDIBA), this letter presents a new voltage-mode (VM) multi-input–single-output (MISO) universal filter. The proposed filter contains only single VDIBA, two capacitors, and one nMOS transistor, operated in triode region, and is used for resonance angular frequency tuning. Since in the structure no resistors are needed the filter can be classified as resistorless. The VM MISO filter compared with other active building block-based counterparts is very simple, it contains only few transistors, and has the smallest size area. Moreover, no component matching is required and it shows low sensitivity performance. The theoretical results are verified by SPICE simulations using TSMC 0.18 μm level-7 SCN018 CMOS process parameters with ±0.9 V supply voltages. In addition, the behavior of the proposed VM filter was also experimentally verified using commercially available integrated circuits OPA660 and AD830.

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Acknowledgments

Ing. Norbert Herencsár, Ph.D. was supported by the project CZ.1.07/2.3.00/30.0039 of Brno University of Technology. Research described in this letter was also in part supported by the project SIX CZ.1.05/2.1.00/ 03.0072 from the operational program Research and Development for Innovation, by the project WICOMT CZ.1.07/2.3.00/20.0007 financed from the operational program Education for competitiveness, BUT Fund No. FEKT–S–11–15, and Czech Science Foundation projects under No. P102/11/P489 and P102/09/1681. Authors also wish to thank the anonymous reviewers for their useful and constructive comments that helped to improve the paper.

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Correspondence to Norbert Herencsar.

Appendix

Appendix

This section provides full nomenclature of the aforementioned ABBs in Table 1.

OTA:

Operational transconductance amplifier

CFA:

Current feedback amplifier

CCCCTA:

Current controlled current conveyor transconductance amplifier

CDTA:

Current differencing transconductance amplifier

CCCDBA:

Current-controlled current differencing buffered amplifier

DBTA:

Differential-input buffered and transconductance amplifier

FDCCII:

Fully differential current conveyor

CFTA:

Current follower transconductance amplifier

CCII:

Second-generation current conveyor

DVCC:

Differential voltage current conveyor

VDBA:

Voltage differencing buffered amplifier

DDA:

Differential difference amplifier

VDIBA:

Voltage differencing inverting buffered amplifier

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Herencsar, N., Cicekoglu, O., Sotner, R. et al. New resistorless tunable voltage-mode universal filter using single VDIBA. Analog Integr Circ Sig Process 76, 251–260 (2013). https://doi.org/10.1007/s10470-013-0090-2

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Keywords

  • Active filter
  • Multi-input–single-output (MISO)
  • Universal filter
  • Resistorless filter
  • Voltage-mode
  • Voltage differencing inverting buffered amplifier (VDIBA)