A constant current source of the differential amplifier circuit

Posted on Mar 28, 2007

A constant current source of the differential amplifier circuit (2) having a constant current source of the differential amplifier with emitter resistor in differential amplifi

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er, where larger, a Ua also increases, which is not appropriate. In order to make every time increases, Ucc can be lower, triode available, this circuit is called a constant current source transistor of the differential amplifier, as shown in FIG. Figure, s, played a role in the partial pressure for VT3 base provides a bias voltage to work in the enlarged state. How it works: When the potential of the rise, Si, Si increases, the voltage across I * 3Re should be increased, but remained unchanged Gong, forcing U. Decreases, so that the island is reduced, causing reduced Si, such as the rise is suppressed to maintain the constant 3, and this is the role of the constant current source of the transistor VT3. Si unchanged, Si suppressed, as can not be increased, so as to suppress the zero drift.

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