Low-voltage low-noise gate driven quasi-floating bulk self-cascode current mirror operational transconductance...

Area of Science:

• Electrical Engineering
• Microelectronics
• Analog Circuit Design

Background:

• Operational Transconductance Amplifiers (OTAs) are fundamental building blocks in analog-mixed signal circuits.
• Traditional current mirror OTAs face limitations in performance metrics like gain, bandwidth, and power consumption.
• Self-cascode and quasi-floating bulk techniques offer potential improvements in OTA design.

Purpose of the Study:

• To introduce a novel gate-driven quasi-floating bulk self-cascode current mirror OTA.
• To evaluate the performance of the proposed OTA design at a low supply voltage (±0.9 V).
• To demonstrate the superiority of the new design compared to existing OTA architectures.

Main Methods:

• Circuit simulation in 0.18 µm technology.
• Design and implementation of a gate-driven quasi-floating bulk self-cascode current mirror OTA.
• Comparative analysis with gate-driven self-cascode and regular current mirror OTAs.

Main Results:

• Achieved a DC gain of 70 dB.
• Obtained a gain bandwidth of 250 kHz.
• Demonstrated low noise (2.8 µV/√Hz at 1 Hz) and low power consumption (2.96 µW).

Conclusions:

• The proposed gate-driven quasi-floating bulk self-cascode OTA exhibits excellent performance characteristics.
• The design surpasses conventional current mirror OTAs in key performance metrics.
• This advanced OTA can significantly enhance the performance of analog-mixed signal circuits and systems.