Virtual right leg drive and augmented right leg drive circuits for common mode voltage reduction in ECG and EEG measurements
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United States of America Patent
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Feb 28, 1995
Grant Date -
N/A
app pub date -
Aug 20, 1993
filing date -
Aug 20, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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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