Digital 1 V 82 μW Pseudo-Two-Stage Class-AB OTA |
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Authors: | Shujuan Yin »¯ Yihe Sun Xiangyu Li ý |
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Institution: | aTsinghua National Laboratory of Information and Technology, Institute of Microelectronics, Tsinghua University, Beijing 100084, China |
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Abstract: | A low power digital operational transconductance amplifier (OTA) was developed for low voltage switched capacitor applications. The OTA has a high slew rate (SR) and a large open loop gain with a differential pseudo-two-stage Class-AB structure. A fully compensated depletion mode capacitor is used in the switched capacitor common mode feedback block instead of a metal-insulator-metal (MIM) capacitor to reduce the fabrication cost. Simulations show that with a 1.0-V supply voltage and a 34-pF load at each output terminal, this digital differential pseudo-two-stage Class-AB OTA realized in 0.13-μm technology achieves a 63.5-dB DC gain and a 0.83-V output swing. The slew rate is ±16.29 V/μs and the total power dissipation is only 82 μW. |
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Keywords: | low voltage low power operational transconductance amplifier (OTA) fully compensated depletion mode MOS-capacitor Class-AB |
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