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Differential amplifier
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==== Input/output impedance ==== The input impedance of the differential pair highly depends on the input mode. At common mode, the two parts behave as common-collector stages with high emitter loads; so, the input impedances are extremely high. At differential mode, they behave as common-emitter stages with grounded emitters; so, the input impedances are low. The output impedance of the differential pair is high (especially for the improved differential pair with a current mirror as shown in [[#Figure_3|Figure 3]]).
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