SU1019340A1 - Controlled sweep generator - Google Patents

Abstract

A CONTROLLED SCAN GENERATOR containing a sawtooth driver, a KOTCJ input is connected to the output of the starting control unit, and the output is connected to the input of the blocking element whose output is connected to the first input of the starting control unit, the second input of which is connected to the output of the synchroimpulse generator, about t l and h

Description

FIG. The invention relates to a pulse technique and is intended for use, for example, in synchronization circuits of sweep generators. A device is known for isolating a first pulse from a series containing a JK trigger, inputs J and K of which are combined, the C input is connected to the input bus 1 1. However, the device does not provide synchronization of the sweep generator. The closest technical solution to the invention is a controlled sweep generator containing a sawtooth voltage generator, the input of which is connected to the output of the starting control unit and the output with the input of the interlock element whose output is connected to the first input of the starting control unit, the second input which is connected to the output of the clock generator C23. The disadvantages of the device are low reliability and low speed. The purpose of the invention is to increase the reliability of the device while simultaneously increasing its speed. The goal is achieved by the fact that in a controlled sweep generator containing a sawtooth driver, the input of which is connected to the output of the starting control unit and the output is connected to the input of the blocking element whose output is connected to the first input of the starting control unit and the second input of which is connected with the output of the synchro driver, the start control unit is made in the form of a D-flip-flop, the inverse of which is the output of the start-up control unit, the T-input is its second input, the combined O and R-inputs are its first input m. Figure 1 shows the structural electrical circuit of the device; Fig. 2 shows plots explaining the operation of the device, at the output of the sync pulse generator (Fig. 2a), at the output of the blocking element (Fig.26), at the inverse output of the 0-flip-flop (Fig.2b), at the output of the ramp saw voltage (fig, 2g). The device comprises a sawtooth voltage driver 1, a start control unit 2, a blocking element 3, a clock driver h, an O-flip-flop 5. The device operates as follows. When the investigated signal is fed to the input of the generator of the C of synchro-pulses, short pulses of positive polarity are formed at its output with the level of a logical unit (Fig. 2a). The signal at the output of driver 1 appears when its input is a logical zero. Block 3 is triggered at a certain positive voltage at the output of the device and the blocking signal has a logic level of zero. After switching on the device, in the absence of synchronous pulses, either the logical unit or the logical zero is set at the inverse output of the O-flip-flop. In the first case, the circuit is in the initial state, in which the output of the former is low and the output of blocking element 2 is a logical one. In the second case, i.e. when a logical zero is set at the inverse output, the circuit, after running one sweep cycle, becomes the original standby mode. When the blocking signal expires for the duration of the clock pulse, time 1 (fig, 2b), driver 1 does not start, since the zero blocking signal present at the setup input sets the D-flip-flop 5 to the state where the logical unit is at the inverse output. The moment t reflects a situation in which an unstable (untimely) start of the former 1 sawtooth voltage could occur, i.e. when the block signal is terminated for the duration of the sync pulse. But since the moment t. is preceded by a zero signal level at the inputs D and RD-flip-flop, then during the zero-blocking signal at the output Q of the D-flip-flop 5 a logical unit is set, which is not allowing for the shaper 1. The state of the D-flip-flop occurs only with the positive course of the following: ... of its sync pulse. This is f by the D-flip-flop.

310

The beginning of the D-flip-flop state change is reflected by the moment t (Figure 2b).

After a time due to the D-flip-flop delay, the output Q of the last one appears zero (time 1h, fig.2b), which is a resolution for the operation of the former 1. After the time "due to the delay of the response of the former, 1 a rising sawtooth voltage appears (time t, fig 2d). When a sawtooth voltage reaches a predetermined level, a blocking element is triggered and a zero level appears at the output (moment t. Fig. 26). After a time due to the 0-tri1-trigger response delay, a logical unit appears at the output Q of the last ( moment C, fig. 2c), which is prohibitive for operation of shaper 1. After time tj-t5, due to

04

By turning off the sawtooth driver, the zero level is set at the output of the sawtooth (moment t-, Fig. 2d). After

the end of the zero level of the blocking signal (its beginning is reflected by the moment% in FIG. 26) beyond the duration of the sync pulse, the circuit is ready for the next cycle, the beginning of which is reflected by the moment in FIG. 2, The operation of the circuit at time tg, t is identical to its operation at times .t A, tiq ..

Setup input S D flip-flop and

its output Q is not used (not shown).

The considered technical solution, due to the use of a D-trigger as a control unit,

provides a quick passage of the sync pulse to shaper 1 and thereby increases the speed of the device as a whole.

iztiti, iststj

te t5 tjo

Fmg.2

Claims (1)

CONTROLLED DEVELOPER GENERATOR containing a sawtooth voltage shaper, the input of which is connected to the output of the start control unit, and the output - with the input of the blocking element, the output of which is connected to the first input of the start control unit, the second input of which is connected to the output of the synchronization driver, which differs that, in order to improve the reliability of the device while improving its performance, the start control unit is made in the form of a D-trigger, whose inverse output is the output of the unit starting a systematic way, T-vhodogo second input, and the combined D R - inputs - its first input.