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关于运算放大器，
请告知CMOS运算放大器和双极型运算放大器的不同之处。
- CMOS运算放大器具有极小输入偏置电流（pA级）和低耗电量的特点。CMOS工艺的耐压低，适于低电源电压的应用。虽然双极型运算放大器的输入偏置电流、消耗电流比CMOS运算放大器多，但其具有易于提高耐压、低噪声、低偏置、宽频带的特点。

Is it a problem to Pullup the SCL and SDA lines of the I²C interface to 3.3V if DVDD=1.8V?
- 3.3V as the pull up source is acceptable even if DVDD is 1.8V. But NVCC_I2C of the I²C domain in SoC should be 3.3V (the same voltage as the pull up source for PMIC) and DVDD in PMIC always needs to be 1.8V.

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