摘要
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 dif- ferential 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 ±16.29V/μs and the total power dissipation is only 82 μW.
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 dif- ferential 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 ±16.29V/μs and the total power dissipation is only 82 μW.
基金
Supported by the National Natural Science Foundation of China(No.60236020)
the Specialized Research Fund for the Doctoral Program of Higher Education (No.20050003083)
