SU428528A1 - EMITTER REPEATER1 - Google Patents

Description

The proposed zmitterny repeater can be .ipol-ized in ortical systems.

Ivvestin Ehshtterny repeater, made on two transistors in a composite circuit, in the emitter circuit of the second transistor which includes a resistor divider with a circuit following negative feedback on the transistor, the base of the latter connected to the emitter of the second transistor, and the collector to the corresponding terminal of the litany source.

However, the known device has a low stability of the transistors.

In order to reduce nonlinear distortions and increase the stability of the operating mode in the proposed emitter follower, the emitter of the transistor of the negative feedback circuit is connected through the iK Zener diode to the midpoint of the resistor, and through the other Zener diode to the collector of the first amitter follower transistor.

The drawing shows a schematic diagram of the proposed repeater.

The emitter follower includes first and second transistors f, 2, respectively, Zener diode 3, transistor 4 of a negative feedback circuit, load resistor 5, resistor 6, 7 voltage divider, and Zener diode 8.

The emitter follower is made of transistors / and 2 according to a composite circuit. The collector of the transistor 1 is connected via the Zener diode 3 to the emitter of the transistor 4 of a negative feedback circuit. The base of transistor 4 is connected to the emitter of transistor 2, to which is also connected a load resistor 5 and a resistor 6 connected to a resistor 7 and a zener diode 8 connected to the emitter of transistor 4, the collector of which is connected to a power source. The Zener diode 3 is connected via a transistor 4 to a kolliktor transition — the base of the transistor /, creating a constant bias voltage at this transition during operation and thus stabilizing the reverse collector current of the transistor /. Direct my current

The emitter follower or the control current is stabilized by the zener 8 connected through the transistor 4 to the resistor 6 of the voltage divider of the emitter follower, creating a constant voltage on it that does not depend on the input potential.

If the current flowing through the load resistor 5 is significantly less than the current flowing through the transistor 2, then almost constant current will flow through the transistor 2.

determined by the magnitude of the resistor 6 and the turn-on voltage of the zener diode 8.

In this way, at any input potential: In the working section of the input and voltage supply, the direct current of the emitter base 1PO) Secondary is provided.

Subject invention

The emitter repeater, made on two trapsistors according to a composite circuit, in the emitter circuit of the second transistor of which a resistive divider is connected, with a following circuit

negative feedback on the transistor, the base of which is connected to the emitter of the second trasistor, and the collector to the corresponding terminal of the power source, characterized in that, to improve stabilization of the transistors mode and reduce nonlinear distortion, the emitter of the negative-feedback negative-circuit transistor is connected through the zener diode. to the midpoint

resistor divider, and through another Zener diode - to the collector of the first transistor of the emitter locator.

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