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Virtual right leg drive and augmented right leg drive circuits for common mode voltage reduction in ECG and EEG measurements
Virtual right leg drive and augmented right leg drive circuits for common mode voltage reduction in ECG and EEG measurements
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机译:虚拟右腿驱动器和增强型右腿驱动器电路,用于降低ECG和EEG测量的共模电压
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摘要
An isolated amplifier, typically a biomedical amplifier, includes a main amplifier having inputs for receiving signals, a circuit for sensing a common mode voltage received by the inputs from the electrodes and providing a compensation voltage representative of the common mode voltage, and a capacitance to chassis ground for receiving a voltage representative of the compensation voltage. The circuit and the capacitance cause the amplifier power supply voltages to track the common mode voltage. The capacitance permits the feedback loop gain to be increased, thereby reducing common mode voltage errors.
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