SU1256172A1 - Expander of time intervals - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to improve the accuracy and reliability of the expansion of time intervals. The extender contains an input trigger 2, control triggers 3 and 4, generators 5 and 6, and comparison block 7. The introduction of the T-BAND element and the counter 8 with the formation of new functional connections reduces the range of change of the sawtooth voltage and blocks one of the inputs for the time of formation of the output pulse. 2 Il. . B.

Description

one

This invention relates to a measurement technique.

The purpose of the invention is to improve the accuracy and reliability of the expansion of time intervals by reducing the range of change of the sawtooth voltage and blocking one of the inputs for the time of formation of the output pulse.

Figure 1 shows the functional diagram of the extender time intervals; 2 shows timing diagrams for his work.

The expander contains the element 1 BLOCK, input trigger 2, triggers 3 and 4 controls, generators 5 and 6, block 7 comparison, counter 8, input buses 9 and 10, output bus 11.

Figure 2 shows the signals: a - the pulse of the beginning of the input interval on the input bus 9; 5 - the pulse at the end of the input interval on the input bus 10; L - at the output of the input trigger 2 {g - at the output of the first control trigger 3 - (expand the output l) J 3 - at the output of the trigger 4; e - output signals of the generators 5 and 6; W - at the output of the comparator block 7, - at the output of the counter: 8.

The input bus 9 extenders through the element .1 BANKS is connected to the input of the input trigger 2, the second input of which is connected to the bus 10. The outputs of the trigger 2 are connected to the inputs of the trigger 3 and 4, the second inputs of which are connected to the overflow output of the generator 5. The output of the trigger 3 is connected to the input of the generator 5, one of the inputs of the element 1 BANGE, the zeroing input of the counter and the output bus 11. The output of the trigger 4 is connected to the inputs of the comparison unit 7, the output of which is connected to the counter input of the counter

8 and generator zero reset input 6.

Expander works as follows.

In the initial state, the triggers 2-4 are in the zero state, the generators 5 and 6 and the counter 8 are reset. Element 1 is open with zero potential at trigger output 3.

When a pulse arrives on the bus

9, the expander (Fig. 2a), the trigger 2 switches to the one state (Fig. 21 |), and the front of the pulse at the first output switches to the trigger 3 (Fig-g).

72i

At the output, the expander is formed by the output pulse. The output signal of the trigger 3 starts the generator 5 with a slope a (Fig. 2e). The pulse of the end of the input interval returns the trigger 2 to the initial state, the trigger 4 is set to one state (FIG. 23) by the pulse front at the inverse output of the trigger 2.

Element 1 BANGE prevents the false switching of trigger 2 to the one-unit state after its return to its initial state with a pulse of the end of the input interval.

The trigger 4 controls the generator 6, at the output of which a sawtooth voltage is formed with a slope b (Fig. 2e). The sawtooth voltages are compared by the comparator block 7, at the output of which, when they are equal, a short pulse is generated (Fig. 2g), the obstinate generator 6 with steepness b. Since the trigger 4 remains in the single state, the saw voltage is formed again at the output until the next operation block 7. The operation pulses of the comparison unit 7 are counted by the counter 8 with the capacitance n. After the counter is filled, when the comparison block 7 is triggered, the counter 8 overflows, the pulse from its output (Fig. 2h) sets to its initial state rigger 3 and 4 and the oscillator 5. The zero potential with trigger 3 vkoda counter 8 is reset to zero, inverted element 1 is opened and the expander is ready for the next input conversion interval.

The duration T, (FIG. 26), as in the known device, is determined by the expression T, (1 -ot), - tgjj Duration T; and t, 4 | are related by the recursive relation

t, - „t (.

Indeed, the output voltage of reHepaiTopa 5 through time T ,, is

and

Iff

a ,, t, output voltage

generator 6 at time T; it is equal to zero therefore it reaches the value of Uj + i in time T, h, - T; i.e. - a T ;, b (T; ,, - T ,.) or T - „

B T; (1-oi) -, T; ,

b - a Similarly, you can write

i-g

T) (l-oir -Tj.,; T, -., (1- «) M: T;., (1 -VG. T-., Etc. Therefore, T„ Tgb ,, (l -ix) t

 (i-d) - T.

ph

 ... (1- “), -h

 (1-od) th, i.e. k (1st) In the proposed expander, the required expansion coefficient provides at lower values of the axes than in the well-known, therefore, the influence of the inaccuracy of setting the CKOpocTieft ratio of sawtooth voltage and its instability is significantly reduced.

The effect of error is l; by a factor of 5, the expansion coefficient decreases tenfold for n 2-6. The reliability of the device is enhanced by the fact that the input trigger is blocked by one of the inputs during expansion, which prevents its false switching by an information pulse or interference.

Claims (1)

Formula of the invention, 5 A time interval expander containing an input trigger, one of Editor V. Petrash Compiled by V. Gerasimov Tehred L. Serdyukova Proofreader G. Reshetnik Order 5148 Circulation 816 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Design, And o 50 five the inputs of which are connected to one of the input buses, the outputs of the input trigger are connected respectively to the first inputs of the first and second control triggers, the second inputs of which are combined, the outputs of the first and second control triggers are connected to the inputs of the first and second sawtooth voltage generators, the outputs of which are connected to the inputs Comparison unit, which differs from the fact that, in order to increase accuracy and reliability, the BANGE element and the counter, the first input of which is connected to the output of the comparator unit and the second the input of the second sawtooth generator, the counter output is connected to the second input of the first sawtooth generator and the combined inputs of the control triggers, the output of the first control trigger is connected to the output bus, the second input of the counter and the first input of the BANNER element, the second input of which is connected to another input bus, and the output - to the second input of the trigger input.