SU500575A1 - Dynamic Load Amplifier - Google Patents

Description

(54) LOAD DYNAL SCREEN EXT.

   one ., ,

This invention relates to radio engineering and can be used in radio receiving measuring and calculating devices.

Known amplifier with dynamic load, contains an input stage on the transistor connected according to the scheme with a common emitter, and dynamic load made on the second transistor, the base of which is connected to the collector of the first transistor, and the emitter is connected to a circuit of connected resistors and a nonlinear element The connection point of the latter through the second resistor is connected to the common bus of the amplifier.

However, a known amplifier has a low mode stability with fluctuations in supply voltages and ambient temperature.

 The purpose of the invention is to increase the stability of the amplifier mode.

For this, there is a third resistor between the nonlinear element and the collector of the first transistor rkkkien, and the place where the last is connected to the nonlinear element

through the fourth resistor is connected to the collector of the second transistor. ,

The drawing shows a conventional electrical amplifier circuit.

An amplifier with dynamic load contains an input stage on transistor 1 connected according to a common emitter (OE) circuit and a load on the second transistor 2, the base of which is directly, and the emitter is a series-connected resistor 3, a nonlinear element 4, for example a zener diode, and the resistor 5 is connected to the 4lelector of the transistor 1, and the junction of the resistor 3 and the cathode of the nonlinear element 4, the skull resistor 6 is connected to the common bus 7 of the amplifier, and the place of the anode of the nonlinear element 4 | And resistor 5 The cut resistor 8 is connected to the collector of the transistor 2 and the minus bus 9 of the power supply. The emitter of transistor 1 is connected to the connection point of resistors.

Claims (2)

1O, 11, which are the mixing voltage divider, in parallel with which the Zener diode 12 is connected. The connection point of the resistor 11 in the cathode of a hundred of 12 is connected to the unmoftr sheath of the bodies, and the Zener diode 12 is connected to the junction box of the 14th source of mixing through the RVSIOgr. Between o & bus 7 uspital and the base of transistor 1 is enabled an input source 15 with an internal resistance 16. The junction point of the resistors 3, 6 and KAtooBi of the nonlinear element 4 is 1 | output 17 amplifier. The amplifier works as follows: | {|. Ed The input signal source 16 through-1 cut internal resistance 16 is directed to a change in the collector current of the transistor / resistor 1. This current creates a drop in the signal voltage on the dynamic load from transistor 2. . Shrunk voltage (affects the base. Of the transistor 21 connected according to the following scheme: common collector m {OK.) 1 The output signal voltage is released on the renderer B, which enters the emitter load of the transistor 2. Transistor 2 is covered by negative current feedback, and its equivalent resistance of the collector circuit is much greater than the dynamic resistance of the collector circuit of transistor 1. As a result, the dynamic load of the amplifier on transistor 2 will play the role of a broadband filter in relation to 6 voltages. In addition, it stabilizes the collector current of the temperature fluctuations surrounding the ambient 3d by eliminating the resistors shunting the dynamic load, which ensures non-linear distortion. Since the output impedance of the antenna is less than 7 resistors 6, it does not (shuat; dynamic load of the amplifier. Invention A dynamic load amplifier containing an input cascade on a transistor connected according to the circuit with general emitter TepoMjH dynamic load is made on the second a transistor, the base of which is connected to the collector of the first transistor, and the emitter is connected to a circuit of a series-connected resistor and a non-linear element, and the junction of the latter, via the second resistor, is connected to the common bus bus Ithel, characterized in that, in order to increase the stability of the mode, and a nonlinear element between the collector of the first transistor is included a third resistor, and place the latter compound with a nonlinear element through a fourth resistor connected to the collector of the second transistor.