SU1251307A1 - Amplifier-limiter of current pulses - Google Patents

Abstract

The invention relates to a pulse technique. The purpose of the invention is to reduce the power consumption of a current limiting amplifier, made according to a common base (ON) scheme and having a control voltage source connected to a common bus. This is achieved by introducing a diode-capacitor series circuit, the diode of which is connected in parallel to the base-emitter junction of the transistor, and the capacitor is between the emitter and the power supply bus, which allows to get the operating mode in the circuit with OUT, as in circuit common emitter (OE). The device combines the advantages and schemes with OB, and schemes with OE. 13.P.F-Ly, 3 Il. to 01 od about

Description

The invention relates to the H niv; ibci - :() ii technique and can be used to form a current pulse of a given amplitude, which is determined by the -: point source, in the active load.

The purpose of the invention. It is a way of thinking about energy consumption while adjusting the amplitude of the pulses.

FIG. 1 is shown at 11 and 11 aa e.: The electrical circuit of the amplifier — limiting current pulses; pas figs. 2 shows an embodiment of the proposed device; pas figs. 3 — a device circuit option using not a common one) from a common source of collector power.

The device (Fig. 1) contains the main transistor 1, connected but to the common base circuit (ON) and connected by the emitter to the source 2 of the input current pulses formed by the source 3 of the pulses of the voltage UB with the series-connected resistor 4, and the collector through the load resistor 5 a power source 6 with a large internal sonroon.m, formed by a source 7 of the voltage with a series-connected resistor 8, a capacitor 9 connected between the emitter of the transistor 1 and the clay of the power source 6 of power E, a diode 10 connected tionary counter-Bazo e.mitter- Nome transition transistor 1, a source 1 control voltage Uynp, defining a slice level, connected through a clamp diode 12 to the collector of the transistor 1.

The device works as follows.

In the absence of an input signal, the capacitor 9 is charged up to the voltage E of the power supply. The transistor is wired, the current through the resistor 5 of the load is zero, and the circuit does not consume energy.

With the arrival of the negative polarity pulse, transistor 1 opens. The collector current of transistor 1, the flow through resistor 5, discharges the capacitor 9. In this case, despite the fact that, in the utilized state, the transistor is switched on according to the circuit with ON, during the action of the input pulse in the collector circuit it flows the current is p times the input current than to turn on the transistor according to the common emitter (MA) circuit.

When the voltage on the collector of Tpaiisi of resistor 1 becomes less than the control source voltage P, current will begin to flow through diode 12, preventing the discharge current from increasing by the capacitor across the clock; resistor 5 load, and therefore 1, and: c- cut transistor 1.

Thus, an av -; - somatic reduction of the emitter currents and a col .: 1 sector of transistor 1 occurs when the voltage on the collector of the transistor i is reached

0

pogo (regul.mego) voltage value. The device has an ip function of an amplifier — about a fan of current pulses in an active unit using {regulated (mch)) a control source voltage that is able to be grounded. With an atom, the amount of current consumed from the source 2 of the input pulses and from the source 1 of the controlling nanotechnology is P (p is the gain of the transistor) times the load MeHbHJe (through the resistor 5). Consequently, the device is characterized by low power consumption from the sources of control voltage and the input signal with respect to the amplifier-limiter according to the circuit with ON, which is equivalent to an increase in its input resistance by a factor of.

Presented by {lia lia FIG. 2, the device is preamp; 1 is a current limiting amplifier, in which the transition of an additional transistor of a different conductivity is used as a diode, which also controls the level of the control voltage. This creates an additional effect — accuracy and stability; it gives a certain level of limitation.

Obtaining a powerful current pulse for a resistor 5 with limiting its value at a given level is also possible according to the scheme (Fig. 3), in which the capacitor 9 and the source 6 of the power supply are replaced by a twist. ynt.chym source of tension.

The equivalent circuit shown (Fig. 3) illustrates the implementation of an amplifier-limiting circuit with an OE using a source of correct voltage, which is connected to a common njn-non source and using a source of electrical power that is not connected to a common source.

Claims (2)

1. Strengthen; 1b-01 ra: 11 impitel imp. current shorts, a weakening transistor connected to an iio circuit with an obi base, the emitter of which is connected to an input pulse source, characterized in that, in order to reduce power consumption while regulating the amplitude of the pulses, a control voltage source connected through a diode is introduced into it to the collector of the transistor, and a diode-capacitor circuit, the diode of which is connected to a pair; 1 meets the i; o base-emitter junction of the transistor, and the capacitor is between the emitter of the transistor and the power supply. 2. Device no. 1, characterized by the fact that the base-transmitter transition of an additional transistor of the opposite conductivity type, whose collector is connected to the emitter of the main transistor, is used as the diode. 2 Uijnp srig.Z