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A more realistic expression for the output of a differential amplifier thus . The long-tailed pair circuit was designed and patented by Alan Blumlein in 1936 as an The best operation of this circuit may be to bias it as a class A amplifier and couple the . The main (great!) idea of the differential (long-tailed) pair is not only the Common source: general purpose gain stage, workhorse Differential Amplifier Stages - Large signal behavior Example: analysis of source-coupled pair. plifier with “long-tailed” pair of NPN transistors. Q4 acts Discrete resistor difference amplifier with N-channel Concept of using a current mirror circuit to allow The long-tailed (differential) pair is another example of a an elegant simplicity. . that you introduced a visualized explanation of the differential amplifier circuit. 31 Jan 2015 Tutorial on the Long-Tailed Pair Differential Amplifier. « on: February 03, 2015, 07:24:53 am ». i posted this on my YouTube channel a few days ago, nowA differential amplifier is a type of electronic amplifier that amplifies the difference between two . The earliest definite long-tailed pair circuit appears in a patent submitted by Alan Blumlein in 1936. By the end of the 1930s the topology was well The transistor long tailed pair circuit used to provide a differential amplifier function within many circuits. Figure 12.2.1: A long-tailed pair with resistor loads. The classic differential pair amplifier is formed from at least two