SU1162022A1 - Controlled square-wave generator - Google Patents

Description

The invention relates to a pulse

technology and may find application in

instrumentation circuits for the formation of stimulating

impacts. , five

Known pulse forming device comprising an input transistor whose base is connected to the bus input signals through current-limiting element, consisting of a parallel connected resistor and capacitor, two switching transistors of different conductivity types, whose emitters are connected to the positive and negative rails of the first sources ⁵ ^ ka supply The collectors are connected to one output of the feedback resistor, and the bases are connected via similar current-limiting links to the collector of the input transistor, up to ol- tively transistor ²⁰ reverse relative to the input transistor conductivity type, an additional capacitor and an output stage, the collector of transistor additional $ ² is connected to the collector of the input transistor, an emitter connected to the second power supply shynoy, additional transistor emitter connected to the bus of the third power source 30 , and the base is connected directly to another output of the feedback resistor and connected via an additional capacitor to the input signal bus, switch collectors -15 sistent transistors are connected to the bus output signals through the output stage 0] ·

A disadvantage of the known device is the low functional possibilities due to the fact that the device generates only bipolar pulses.

Also known is a two-channel pulse shaper, containing in each channel 15 a control transistor, the collector of which is connected to the base of the accelerating transistor, an output transistor with emitter load, fixing and accelerating diodes AND KOH-50 sensor, connected by one plate to the common input of the driver, in one channel of the driver the second capacitor plate is connected to the cathode of the clamping diode and connected to the emitter of the control ppr transistor, the base of which is connected through the charge accumulating diode

to the power bus to which are connected fixing _ί anode of the diode, the collector output n -p-η transistor and the accelerating anode of the diode, the cathode of which is connected to the collector of accelerating the n-p-η transistor connected to the emitter of the output transistor base, and the other channel generator The second capacitor plate is connected to the anode of the fixing diode and connected to the emitter of the control PP-P transistor, the base of which is connected to the common bus through which the cathode of the fixing diode is connected to the common bus, the collector output th ppp transistor and the cathode of the accelerating diode, the anode of which is connected to the collector of the accelerating ppp transistor connected to the base of the output transistor by the emitter, and the base and emitter of the accelerating transistor of one channel are connected respectively to the base and emitter of the accelerating transistor of another channel 0].

A disadvantage of the known devices are low functionality.

The closest to this is a rectangular pulse shaper containing a master oscillator, a trigger, transistor switches of pnp and npp type, two power sources, resistors and a load resistor, one end of which is connected to a common bus, opposite poles power sources are connected to a common bus, the emitter of a transistor switch of the pp-r type is connected to the positive pole of the first power source, as well as to the master oscillator * and trigger, the emitter of the second power source, collectors of transistor switches with the second end of the load resistor, and their bases are connected via resistors to the emitters and through additionally introduced zener diodes to the trigger output, the input of which is connected to the output of the master oscillator Gz].

A disadvantage of the known device is low functionality due to the formation of the device only two polar pulses.

The purpose of the invention is the expansion

functionalities formiro3 1162022

four

by forming unipolar pulses.

This goal is achieved by

that in a controlled shaper of rectangular pulses containing 5

master oscillator, the first Zener diode, the cathode of which is connected to the base of the transistor pp-p type and the first output of the first resistor, the second output of which is connected to the emitter 10 of the p-P-p transistor and the positive pole of the first power source, the negative base of which is connected to The common bus, the positive pole of the second power supply, 15 and one output of the load resistor, the second output of which is connected to collectors of transistors of pnp and pnp types, the emitter of p-p type transistor is connected to the negative pole of the second and second The power supply and the first output of the second resistor, the second output of which is connected to the base of the transistor ppd type, and the anode of the second zener diode, introduced three logical 25 AND-NOT elements, the logical element And the code dialing unit, the first input of the first logical element AND-NOT connected to the output of the master oscillator, the second input of the first logic element AND-NOT connected to the first input of the second logical element AND-NOT and the first output of the code set block, the second output of which is connected to the first input of the third lo element and NAND, the second input of which is connected to the output of the second logical element NAND, the second input of which is connected to the output of the first logical element NAND and the first ₄ input of the logical element I, the output of which is connected to the cathode of the second zener diode, output the third logic element AND-NOT connected to the anode of the first Zener diode, the third $ ₄ output block of the code set is connected to the second input of the logic element I.

The drawing shows a structural electrical circuit of the proposed driver.

The controlled shaper of rectangular pulses contains a master oscillator 1 connected to the first logical element AND-NOT 2, the output of which is connected to the second logical element AND-NOT 3, the output of which is connected to the third logical element

AND-NOT 4, the output of the first logic element AND-NOT 2 is connected to the input of the logical element AND 5, the output of the third logical element AND-NOT 4 is connected to the first Zener diode 6, and the output of the logical element And 5 is connected to the second Zener diode 7, the cathode of the first Zener diode 6 is connected to the first resistor 8 and the base of the transistor ppn type 9, the anode of the second set-. throne 7 is connected to the second resistor 10 and the base of the transistor η-pp, type 11, the second terminal of the first resistor 8 is connected to the emitter of the transistor pnpr type 9 and the positive pole of the first power source 12, the negative pole of which is connected to the positive pole The second source 13 and one output of the load resistor 14, the second output of which is connected to the collectors of type 9 and η-ρ-p transistors of type 11, the first output of the code set block 15 is connected to the inputs of the first 2 and second 3 logic elements And -NO, the second output of the dial code block 15 connect ene with input of the third NAND gate NAND 4, and a third set of code block output coupled to an input of the AND gate 5. code dialing unit 15 includes, for example, mechanical switches.

Managed shaper rectangular pulses works as follows.

If from the first output of the code dialing unit enters "0", then the pulses of the master oscillator 1 cannot arrive at the outputs of the second and third N-3 and 4 logic elements.

If the first output of the code set block 15 is “1”, the second output is “1”, the ac of the third is “0”, then the output of the AND 5 (110) logic element corresponds to “0”. The second zener diode 7 is turned off, the transistor η -r-P 11 is closed. At the outputs of the first - the third logical elements AND-NOT 2-4, there are impulses. During the pulse at the output of the third logic element AND-HE 4, the first Zener diode 6 is closed, and during the pause, the first Zener diode 6 is turned on and the p-η-p transistor of type 9 is saturated. This state corresponds to the fact that the controlled rectangular pulse shaper operates in

five

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mode of formation of positive pulses.

If from the first output of the set of code 15 comes "1", from the second output "0" and from the third output "1", then at the output of the third logical element AND-NO 4 level corresponds to "1" (101). The first zener diode 6 off transistor pnp. Type 9 is closed. At the output of the logic element And 5 pulses appear. During the pulse at the output of the logic element And 5 the second Zener diode 7 is turned on and the transistor П-р-й type 11 is saturated. During a pause at the output of the logic element And 5, the second Zener diode is turned off and the type of transistor П-р-Ц 11 is closed. This state corresponds to the fact that the controlled rectangular pulse former operates in the negative pulse generation mode.

If from all outputs of dialing code 15 enters "1", then

the outputs of the logical elements AND-NOT 4 and 5 appear 'pulses in the same phase (111). If the outputs of the logical elements AND-NOT 4 and I 5 appear im5 pulse ("1"), then the first Zener diode 6 is turned off and the transistor р-й-р type 9 is closed, and the second zener diode 7 is turned on and the transistor pnr-p 11 open

If the outputs are logical elements;

¹⁰ Commands I-NE 4 and I 5, there is a pause ("O"), then the first Zener diode 6 is turned on and the type 11 transistor is closed. This state corresponds to the fact that the proposed right-angle pulse generator operates in the bipolar pulse generation mode.

Compared with the prototype of the proposed shaper provides the form ·

2® mirovanie positive pulses, negative pulses, as well as the high-resistance state of the driver, which allows its widespread use in instrumentation.

Claims (2)

CONTROLLED FORMER • RECTANGULAR PULSES containing a master oscillator, the first Zener diode, the cathode of which is connected to the base of the ρ-η-p type transistor and the first output of the first resistor, the second output of which is connected to the emitter of the transistor ρ-η-p and the positive pole of the first power supply , the negative pole of which is connected to the common bus, the positive pole of the second power source and one output of the load resistor, the second output of which is connected to collectors of transistors rr-r and pnp types, emitter tra ican n-p-n type is connected to the negative pole of the second source power supply and the first output of the second resistor, the second output of which is connected to the base of the η-ρ-η type transistor and the anode of the second zener diode, characterized in that, in order to expand the functionality by forming unipolar pulses, three I-NES logic elements are introduced into it, the logical element And the block dialing code, the first input of the first logical element AND-NOT connected to the output of the master oscillator, the second input of the first logical element AND-NOT connected to the first input of the second logical element AND-NOT and the first the output of the code set block, the second output of which is connected to the first input of the third NAND logic element, the second input of which is connected to the output of the second NAND logic element, the second input of which is connected to the output of the first NAND logic element and the first input of the logic element And, the output of which is connected to the cathode of the second Zener diode, the output of the third logical element AND IS is NOT connected to the anode of the first Zener diode, the third output of the dialing set, the code is connected to the second input of the logical element I. > one 1162022 2