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A novel bulk-driven technique is adopted to improve the gain-bandwidth of the conventional recycling current OTA, without requiring any additional power dissipation. Also, the threshold voltage of the transistors is reduced because of bulk-biasing technique, leading to the input/output voltage range extended. To compare the performance advantages of the proposed OTA versus the conventional one, two OTAs were designed in a 1-V 0.18 μm CMOS process. Results show that the proposed OTA’s unit-gain bandwidth is improved by 55% and the input/output voltage range is increased by 140/110 mV. Also, the dc gain is enhanced almost 6 dB.

A 1-V recycling current OTA with improved gain-bandwidth and input/output range