SU1163464A2 - Pulser - Google Patents

Abstract

PULSE GENERATOR for auth. No. 748813, characterized in that, in order to expand the range of generating ps frequencies, a nonlinear element with an N-shaped current-voltage characteristic, connected in series with a load resistor, is introduced into it. (L od from 1

Description

The invention relates to automation, telemechanics, computer technology and can be used in various electronic devices.

According to the main auth. No. 748813 is a known pulse generator containing two MOS transistors of opposite conduction types, whose sources are combined, the drain of the first MOS transistor is connected to the power bus, its gate is connected after a first time to the driving resistor with the power bus and through the first capacitor to the drain of the second ODP transistor, the latter through a load resistor is connected to the common bus and after a second time, the driving resistor is the gate of the second ODP transistor, which is connected to the power bus pj through the second capacitor.

However, the known pulse generator has a limited range of pulse duration, since the maximum value of time per firing resistors is limited by the rate of voltage rise across capacitors, at which an avalanche-like switching process of MOS transistors can occur.

The purpose of the invention is to expand the range of generation frequencies in the direction of increasing the pulse following period.

This goal is achieved by the fact that a nonlinear element with an A / v-voltage characteristic, connected in series with a load resistor, is introduced into the pulse generator.

The drawing shows a circuit diagram of a pulse generator.

The generator contains MIS transistors 1 and 2, capacitors 3 and 4, time specifying resistors 5 and 6, load resistor 7, nonlinear element 8 with N-shaped characteristic power supply bus 9, output voltage terminal 10.

The time setting resistors 5 and 6 and the capacitors 3 and 4 form; KS-bridge. As element 8 you can use a tunnel diode or an L-diode.

The pulse generator works as follows.

When the power is turned on, capacitors 3 and 4 are discharged, both MOS transistors are closed, and at the output terminal 10 - low potential.

Capacitors 3 and 4 are charged from the power source through resistors 5 and 6. When the voltage across the capacitors exceeds the threshold, the voltage of one of the MOS transistors, this transistor starts to open. Suppose that began to open

SchP transistor 2 with p-channel. Opening the MOS transistor 2 leads to a decrease in potential at both sources. As a result of this decrease, the potential difference between the source

and the gate of the MOS transistor 1 begins to increase faster and reaches the threshold voltage of the open MOS resistor 1, and the latter also opens. Opening both

MCP transistors leads to the emergence of current through resistor 7 and element 8 and a gradual decrease in voltage on the KC circuit due to a drop in voltage on resistor 7. With a sufficient increase in the current through element 8, it switches, in the course of which the voltage drops it increases abruptly on it, and decreases on a KC-chain x.

This, in turn, leads to an abrupt increase in the potential difference between the sources and gates of both MIS transistors and contributes to the emergence of an avalanche-like process of switching both MDPtransistors into a saturated state. A high potential occurs at output terminal 10.

After saturating both MOS transistors, the voltage on the KC circuit decreases and capacitors 3 and 4 begin to discharge through resistors 5 and 6 and open MOS transistors. Potential difference between

The origins and gates of both VDPtransistors will decrease.

When the voltage across the capacitors becomes less than necessary to hold the SchCH-transistors

in a saturated state, an avalanche-like process of closing them arises, because a decrease in the current of one of the MIS transistors leads to a decrease in the current through the other MCP transistor and an increase in the voltage on the CS circuits, and consequently, to a decrease in the usefulness of potentials between the sources and . When current

311634644

element 8 decreases the connection of the nonlinear load element to the initial state with an N-shaped characteristic, successively from the re-determined value, improves the condition of occurrence. After the transition of both MIS-transis-MCP transistors and allows the UL to switch to cut-off mode, capacitor driving resistors and, after 3, begin to charge and, further, achieve a larger period

processes in the pulse repetition generator at one and

The capacitors are the same capacity.

5th switching process

Claims (1)

PULSE GENERATOR No. 748813, characterized in that, in order to expand the range of generated frequencies, a nonlinear element with an N-shaped volt-ampere characteristic, connected in series with a load resistor, is introduced into it.