Highly Linear Source-Degenerated OTA with Floating Gate Auxiliary Differential Pair
This paper presents a linear operational transconductance amplifier (OTA) using two signal attenuation techniques (floating gate MOSFET along with nonlinear attenuator) and source degeneration technique to achieve the large input differential voltage range for which linear voltage-to-current conversion is obtained. The proposed linear OTA is simulated on Cadence Virtuoso environment with UMC 0.18 μm CMOS process technology having power supply of 1.8 V. The proposed OTA gives transconductance (Gm) of 70 µA/V when biased with 100 μA current and the third-order harmonic distortion (HD3) is found to be −79 dB for a 400 mVpp input signal at 10 MHz.
KeywordsFloating gate Linearity Nonlinear attenuator OTA Source-degeneration
This work has been performed using the resources of VLSI Laboratory under Special Manpower Development Programme Chip to System Design (SMDP-C2SD) project funded by Ministry of Electronics and Information Technology (MeitY), Government of India.
- 4.Bhadauria, V., Kant, K., Banerjee, S.: Linearity enhancement of 0.18 µm transconductor using active attenuation technique. Can. J. Electr. Electron. Eng. 2, 598–601 (2011)Google Scholar
- 8.Dubey, T., Pandey, R.: Low-voltage highly linear floating gate MOSFET based source degenerated OTA and its applications. Inf. MIDEM 48, 19–28 (2018)Google Scholar
- 13.Ngamkham, W., Kiatwarin, N., Narksap, W., et al.: A linearized source-couple pair transconductor using a low-voltage square root circuit. In: 5th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2008, pp. 701–704 (2008)Google Scholar