SU1205287A1 - Pulse edge duration analyzer - Google Patents

Description

1205287

The invention relates to automation and can be used to create specialized time analyzers of pulse signals,

The aim of the invention is to reduce the error in the analysis of the duration of the front and the extension of the range of the durations of the fronts of the input pulses

FIG. 1 shows a block diagram of the pulse front analyzer i in FIG. .2 timelines of his work; in FIG. 3, a selection diagram.

The pulse front analyzer contains a threshold element

1 high level threshold element

2 low level, trigger 3, the first generator 4 sawtooth voltage with the rate of increase of sawtooth voltage V, the second generator

5 sawtooth voltage with sawtooth voltage V, the first comparator 6 and the second comparator 7,

The signal inputs of the threshold elements 1 high and 2 low levels are combined and connected to the bus of the analyzed input voltage.

im from u

5 this ve ve pi

10 on mo to na na

fs fr mo mo ko qi

20

25 shi no te en ko

thirty

the cues, the reference inputs of the threshold

I and 2 are connected respectively to the bus high and low threshold voltage levels. At the same time, the output of high level threshold element 1 is connected to the input of the first sawtooth generator 4 with a sawtooth voltage rise V, the output of which is connected to the non-inverting input of the first comparator 6, the output connected to the D-input of the trigger 3, the output of the low-level threshold element 2 is connected to the input of the second generator 5 with a sawtooth voltage rise Vj, the output of which is connected with a non-inverting input of the second comparator 7, the output connected to the C-input of the trigger 3, the R-input of which is the Device Reset input, and the inverting output - its output. The inverting inputs of the comparators 6 and 7 are connected to the input of the threshold voltage of the device.

The analyzer of the pulse front duration works as follows,

The analyzed input signal 11 is fed to the inputs of the threshold elements of G high and 2 low levels,

having the threshold voltages, respectively, and „other g and, The signals and, and and of the threshold elements control the operation of the corresponding generators

tori 4 and 5 sawtooth, At time t, (Fig 2), corresponding to the beginning of the expanding interval t, saw saw voltage Uy ,, the speed

the rise of the front of which V, At the time t, corresponding to the end of the expanding interval t, a saw-tooth voltage U, begins to form, the rate of increase

the front of which is V ,, and V, V Moment (FIG. 3) of the equality of the saw voltage. - corresponds to the end of the extended interval. The expansion coefficient K of the time interval is determined by the suppression

K V, / V, -V2,

The accuracy of the analysis of the duration of the ras-. of the expanded interval is determined by the accuracy of the formation of the extended interval, t, e, by the stability of the expansion coefficient K, The error SK of the expansion coefficient is equal to

50

thirty

8K (8Vi-5vO,

Sv - relative SV nowhere, and

Stability speeds increase

V and Vg.

With identical elements of generators 4 and 5 of sawtooth voltage, the relative instabilities ffV and SV turn out to be close, which ensures a small error in the expansion coefficient and, consequently, high accuracy of the analysis.

The signals and and and from the generators 4 and 5 of the sawtooth voltage are fed to the corresponding comparators 6 and 7, which have threshold voltages and “op. The value is set equal to the value of the voltage U and U at the time of their

match t t. (FIG. 3) and is defined by

 go

 rt,

I. max. J

g

where, g - - is a constant one.

The time instant t4 (fig. 2) of the coincidence of the voltages U4 and Ipor is constant

and corresponds to the end of the extended interval. The time point of coincidence of the stresses U, and u „o varies in

depending on the duration of the front t and can take values less than or greater than t. The change in the limits of the analysis over the duration is made by changing the threshold voltage U, Q depending on the required maximum permissible duration of the pulse front.

The result of monitoring the pulse front duration is determined by the temporal position of the pulse U, applied to the D input of the trigger 3, relative to the pulse front Ug fed to the C input of the trigger 3. Logic O at the output of the trigger 3 corresponds to

por.V.

t

Uf

 normal

m

positive analysis result, i.e. t t.gi, j, logical G - negative result. After removing the analysis result with a signal

five . The reset applied to the R input of trigger 3, the trigger is reset.

A wide range of voltage and pores (from O to the maximum

10 of the allowable input voltage of the comparator) allows to expand the range of analyzed pulse durations. Reduction of the used duration of the working

 5-shaped stress reduces the effect. nonlinearity of sawtooth stresses, which further increases the accuracy of the analysis.

and.

pore

Reset

1

U6K

 T.l.

i iMk

Unop

6% U

if

h "5 ig.2

Compiled by C, Klevtsov Editor A, Gulko Tehred M. Parotsay Proofreader B, But ha

Order 8539/58 Circulation 871 Subscription

VNISh State Committee of the USSR

for inventions and discoveries 113035, Moscow,, Raushsk nab., 4/5

Branch IPP Patent, Uzhgorod, st. Design, 4,

Claims (1)

PULSE FRONT DURATION ANALYZER, containing threshold elements of high and low levels, the signal inputs of which are connected to the bus of the analyzed input voltage, and the reference inputs are respectively to the threshold voltage buses of high and low levels, and a trigger whose R-input is the input Reset device and the inverting output is an output, which means that, in order to reduce the analysis error, the duration of the front while expanding the range of durations of the fronts of the input pulses, enter these are the first and second sawtooth generators, the first and second comparators, and the output of the high-level threshold element is connected to the input of the first sawtooth voltage generator, the output of which is connected to the non-inverting input of the first comparator, the output of which is connected to the trigger D-input, and the output of the threshold element is low level is connected to the input of the second * q ramp generator of sawtooth voltage, the output of which is connected to the non-inverting input of the second comparator, the output of the latter is connected. with the trigger C-input, the inverting inputs of the first and second comparators connected to the threshold voltage bus of the device. SU., „1205287>