Calibration-less Nauta OTA operating at 0.25-V power supply in a 130-nm digital CMOS process

• Published in: 2017 IEEE 8th Latin American Symposium on Circuits & Systems (LASCAS) pp. 1 - 4
• Main Authors: Braga, Rodrigo A. S., Ferreira, Luis H. C., Colletta, Gustavo D., Dutra, Odilon O.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-02-2017
• Subjects: CMOS process; Impedance; Inverters; MOSFET; Power supplies
• ISSN: 2473-4667
• DOI: 10.1109/LASCAS.2017.7948039

This work presents an architecture for Nauta fully differential operational transconductance amplifier that requires no additional circuitry for calibration. This design operates with a power supply of 0.25-V, implemented in a 130-nm digital CMOS process. By operating in the weak inversion region and using the transistor array approach, this OTA shows voltage reduction and stable gain using halo implanted transistors. The proposed OTA can operate at a voltage range from 0.15-V to 0.35-V, consuming only 6-nW to 333-nW of power and presenting a measured transconductance of 2.24-μS at 0.25-V. This makes it suitible for low-power G m -C filters, such as biquad, which needs a wider range of frequencies (30-Hz to 6-kHz).