![]() Although the number of stages of amplification remains the same for single-ended and differential amplifiers, differential amplifiers have more requirements to execute, for example, a negative-voltage power supply. For a given number of stages of gain, differential amplifiers have about 50% more parts. Differential amplification takes more parts to execute. It is typically at least 55 dB, and can approach 140 dB in some critically-tuned designs. Common-mode rejection ratio is the measurement of a differential amplifier's ability to not amplify noise that is common to both inputs. Drift is reduced by the tight coupling of the two halves of the amplifier. Differential amplifiers tend to cancel distortions in the output that single-ended amplifiers cannot. This can be very important in moving-coil preamp sections. Differential amplifiers have roughly 6 dB lower noise than the same circuit executed in a single-ended manner. Differential amplifiers also resist input (noise) from the power supply to a much greater degree. Differential amplifiers present a constant load to the power supply, resulting in less noise in the power supply. ![]()
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