1.2 V Differential Difference Transconductance Amplifier and Its Application in Mixed-Mode Universal Filter

Montree Kumngern; Pichai Suksaibul; Fabian Khateb; Tomasz Kulej

doi:10.3390/s22093535

1.2 V Differential Difference Transconductance Amplifier and Its Application in Mixed-Mode Universal Filter

Sensors (Basel). 2022 May 6;22(9):3535. doi: 10.3390/s22093535.

Authors

Montree Kumngern¹, Pichai Suksaibul¹, Fabian Khateb^{2

3

4}, Tomasz Kulej⁵

Affiliations

¹ Department of Telecommunications Engineering, School of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand.
² Department of Microelectronics, Brno University of Technology, Technická 10, 601 90 Brno, Czech Republic.
³ Faculty of Biomedical Engineering, Czech Technical University in Prague, nám. Sítná 3105, 272 01 Kladno, Czech Republic.
⁴ Department of Electrical Engineering, Brno University of Defence, Kounicova 65, 662 10 Brno, Czech Republic.
⁵ Department of Electrical Engineering, Czestochowa University of Technology, 42-201 Czestochowa, Poland.

Abstract

This paper presents a new mixed-mode universal filter based on a differential difference transconductance amplifier (DDTA). Unlike the conventional transconductance amplifier (TA), this DDTA has both advantages of the TA and the differential difference amplifier (DDA). The proposed filter can offer four-mode operations of second-order transfer functions into a single topology, namely, voltage-mode (VM), current-mode (CM), transadmittance-mode (TAM), and transimpedance-mode (TIM) transfer functions. Each operation mode offers five standard filtering responses; therefore, at least twenty filtering transfer functions can be obtained. For the filtering transfer functions, the matching conditions for the input and passive component are absent. The natural frequency and the quality factor can be set orthogonally and electronically controlled. The performance of the proposed topology was evaluated by PSPICE simulator using the 0.18 µm CMOS technology from the Taiwan Semiconductor Manufacturing Company (TSMC). The voltage supply was 1.2 V and the power dissipation of the DDTA was 66 µW. The workability of the filter was confirmed through experimental test by DDTA-based LM13600 discrete-component integrated circuits.

Keywords: analog signal processing; differential difference transconductance amplifier; mixed-mode filter; universal filter.

Grants and funding

This work was supported by King Mongkut’s Institute of Technology Ladkrabang under Grant KREF026201, and by the University of Defence Brno within the Organization Development Project VAROPS.