Design of a Bulk-Driven High-Gain OTA Using Positive Feedback

In this paper, a new high-gain operational transconductance amplifier (OTA) circuit is designed. The proposed circuit uses bulk-driven technique to reduce the required supply voltage while gain-boosting as well as positive feedback techniques are used to increase the gain of the circuit and compensa...

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Bibliographic Details
Published in:Circuits, systems, and signal processing systems, and signal processing, 2022-08, Vol.41 (8), p.4238-4255
Main Authors: Pouya, Behnam, Dolatshahi, Mehdi, Jalalibidgoli, Farzaneh
Format: Article
Language:English
Subjects:
Algorithms
Amplification
Bandwidths
Circuit design
Circuits and Systems
Computer engineering
Design techniques
Electric potential
Electrical Engineering
Electronics and Microelectronics
Engineering
High gain
Instrumentation
Integrated circuits
Operational amplifiers
Optimization
Optimization algorithms
Positive feedback
Power consumption
Signal processing
Signal,Image and Speech Processing
Simulation
Transconductance
Transistors
Voltage
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Summary:In this paper, a new high-gain operational transconductance amplifier (OTA) circuit is designed. The proposed circuit uses bulk-driven technique to reduce the required supply voltage while gain-boosting as well as positive feedback techniques are used to increase the gain of the circuit and compensate the gain reduction effect due to the use of bulk-driven transistors. The performance of the proposed circuit is simulated using 180-nm CMOS technology parameters and is optimized using an optimization algorithm for the main purpose of minimizing the power consumption of the circuit. Simulated performance of the proposed circuit for 1.2 V DC supply voltage shows 94.8 dB gain, 203-MHz bandwidth, and slew-rate of 365-V/µS while occupying die area of 1360 µm 2 . However, the proposed circuit is also designed for a low-voltage scenario with 0.75 V DC supply voltage that results in 73.7 dB gain, 131-MHz bandwidth, and slew-rate of 149-V/µS.
ISSN:0278-081X
1531-5878
DOI:10.1007/s00034-022-01990-z