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设计了一种应用于开关电容电路的自适应偏置的低电压、低功耗开关运算跨导放大器。采用负阻负载技术和自适应偏置技术,分别提高了放大器的增益和转换速率;采用电流镜型OTA技术降低功耗,并通过控制开关关断非工作状态下的运放电源,进一步降低了功耗。新型开关电容共模反馈电路的共模电压可在一个时钟周期内快速稳定,不增加额外功耗,不限制输出摆幅。在SMIC 0.18μm工艺下的仿真结果表明,OTA在0.9V供电下,直流增益达60dB,增益带宽积为1.81 MHz,转换速率为0.94V/μs,功耗为4.16μW。
A low voltage, low power switching transconductance amplifier with adaptive bias applied to switched capacitor circuits is designed. Adopting negative resistance load technology and adaptive bias technology to increase the gain and slew rate of the amplifier separately. The current mirror OTA technology is adopted to reduce the power consumption and the power supply of the nonoperating operational amplifier is shut off by the control switch to further reduce the power consumption. Power consumption. The common-mode voltage of the new switched-capacitor common-mode feedback circuit stabilizes quickly in one clock cycle without adding extra power or limiting the output swing. The simulation results under the SMIC 0.18μm process show that the OTA achieves a gain of 60dB, a gain gain of 1.81MHz, a slew rate of 0.94V / μs and a power dissipation of 4.16μW at 0.9V supply.