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| Q. |
Which of the following amplifier circulatory is employed to reduce the hum noise generated by the power supply in the ECG circuit? |
| A. | band pass filters |
| B. | high pass filters |
| C. | notch filters |
| D. | low pass filters |
| Answer» C. notch filters | |
| Explanation: A notch filter is employed to suppress the hum noise generated by the power supply in the ECG circuit. CMRR of the order of 100–120 dB with 5 kW unbalance in the leads is a desirable feature of ECG machines. The instability of the baseline, originating from the changes of the contact impedance, demands the application of the automatic baseline stabilizing circuit. | |
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