Surgery – Truss – Pad
Patent
1993-08-20
1995-02-28
Kamm, William E.
Surgery
Truss
Pad
128902, A61B 50428
Patent
active
053927842
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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Winter et al, "Reduction of Interference Due to Common Mode Voltage in Biopotential Amplifiers", IEEE Trans. BioMed. Engr., vol. BME-30, No. 1, Jan. 1983 pp, 58-61.
Winter et al, "Driven-Right-Leg Circuit Design", IEEE Trans. Biomedical Engr., vol. BME-30, No. 1, Jan. 1983., pp. 62-66.
Hewlett--Packard Company
Kamm William E.
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