ECG electrode contact quality measurement system
A system and method are provided for generating output signals indicative of contact quality of a plurality of electrodes coupled to a patient. A signal generator coupled to a reference electrode injects an alternating signal into the patient. A plurality of differential amplifiers, each coupled to a respective one of the plurality of electrodes to detect an input signal from the patient, are operable to output a respective output signal in response to a respective input signal. The output signal generated by the respective differential amplifier is indicative of contact quality for the respective electrode.
1. A system for generating output signals indicative of contact quality of a plurality of electrodes coupled to a patient, the system comprising:
a signal generator coupled to a reference electrode and operable to output an alternating signal; and
a differential array amplifier having a plurality of inputs and a corresponding plurality of differential amplifier stages, each input configured to be coupled to a respective one of the plurality of electrodes, each differential amplifier stage including a differential amplifier having a first input coupled to the respective input, a second input coupled to a first floating common node, and an output coupled to a second floating common node, each differential amplifier stage further including a first capacitor-resistor pair coupled in parallel between the output and the second floating common node, a second capacitor-resistor pair coupled in parallel between the second input and the second floating common node, and a third capacitor-resistor pair coupled in series between the second input and the first floating common node, the differential array amplifier operable to output a respective output signal in response to a respective input signal applied to the respective input, the respective output signal indicative of contact quality for the respective electrode.
2. The system of claim 1 wherein the differential array amplifier further including a feedback amplifier having a first input coupled to the signal generator and an output coupled to the reference electrode, the feedback amplifier further having a second input coupled to the outputs of the plurality of differential amplifiers, each output coupled to the second output of the feedback amplifier through a respective resistor.
3. The system of claim 1 wherein each of the plurality of differential amplifiers are coupled to have a common mode gain of unity.
4. The system of claim 1 wherein the system is included in an ECG measurement system operable to acquire ECG signals.