2 Different Amplifier

Different amplifier can only magnify the D-VALUE of 2 signals, but won’t magnify general voltage signal. If design job of different amplifier and Printed Circuit Board aren’t reasonable, when signal level in the low status, general voltage will generate a small differential interference signal. Due to the high input impedance of different amplifier, any parameter imbalance on input point will bring much great interference to circuit. Therefore, during the printed circuit board design process, it has to ensure physical structure of amplifier complete symmetry.

There is a leakage resistance exist in the input point of different amplifier, it can take an effect of imbalance voltage deviation. Designer can solve this problem through add protective device on the input circuit, protective device can circle the signal wire, if it can keep the same voltage with 2 input signal low level, as a result of that, positive resistance value will increase. This device can ensure signal source terminal and protector keep the same voltage with low level of signal source.

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