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Article

Self-Biased and Supply-Voltage Scalable Inverter-Based Operational Transconductance Amplifier with Improved Composite Transistors

1
Biomedical Engineering Institute, Federal University of Santa Catarina (IEB-UFSC), Florianópolis 88040-900, Brazil
2
Department of Electrical and Computer Engineering, National University of Singapore (NUS), Singapore 117583, Singapore
*
Author to whom correspondence should be addressed.
Academic Editor: Igor Filanovsky
Electronics 2021, 10(8), 935; https://doi.org/10.3390/electronics10080935
Received: 6 March 2021 / Revised: 6 April 2021 / Accepted: 11 April 2021 / Published: 14 April 2021
(This article belongs to the Special Issue Analog Microelectronic Circuit Design and Applications)
This paper deals with a single-stage single-ended inverter-based Operational Transconductance Amplifiers (OTA) with improved composite transistors for ultra-low-voltage supplies, while maintaining a small-area, high power-efficiency and low output signal distortion. The improved composite transistor is a combination of the conventional composite transistor and forward-body-biasing to further increase voltage gain. The impact of the proposed technique on performance is demonstrated through post-layout simulations referring to the TSMC 180 nm technology process. The proposed OTA achieves 54 dB differential voltage gain, 210 Hz gain–bandwidth product for a 10 pF capacitive load, with a power consumption of 273 pW with a 0.3 V power supply, and occupies an area of 1026 μm2. For a 0.6 V voltage supply, the proposed OTA improves its voltage gain to 73 dB, and achieves a 15 kHz gain–bandwidth product with a power consumption of 41 nW. View Full-Text
Keywords: Operational Transconductance Amplifier (OTA); inverter-based OTA; push-pull based OTA; improved forward-body-bias; composite transistors; supply-voltage scalable; Ultra-Low-Voltage (ULV); Ultra-Low-Power (ULP) Operational Transconductance Amplifier (OTA); inverter-based OTA; push-pull based OTA; improved forward-body-bias; composite transistors; supply-voltage scalable; Ultra-Low-Voltage (ULV); Ultra-Low-Power (ULP)
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MDPI and ACS Style

Rodovalho, L.H.; Ramos Rodrigues, C.; Aiello, O. Self-Biased and Supply-Voltage Scalable Inverter-Based Operational Transconductance Amplifier with Improved Composite Transistors. Electronics 2021, 10, 935. https://doi.org/10.3390/electronics10080935

AMA Style

Rodovalho LH, Ramos Rodrigues C, Aiello O. Self-Biased and Supply-Voltage Scalable Inverter-Based Operational Transconductance Amplifier with Improved Composite Transistors. Electronics. 2021; 10(8):935. https://doi.org/10.3390/electronics10080935

Chicago/Turabian Style

Rodovalho, Luis H., Cesar Ramos Rodrigues, and Orazio Aiello. 2021. "Self-Biased and Supply-Voltage Scalable Inverter-Based Operational Transconductance Amplifier with Improved Composite Transistors" Electronics 10, no. 8: 935. https://doi.org/10.3390/electronics10080935

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