SU1193823A1 - Time-to-digital converter - Google Patents

Description

The invention relates to information-measuring technology and can

be used in automated measurement control systems

time intervals. five

The aim of the invention is to improve the accuracy of the conversion time interval.

FIG. 1 shows a functional diagram of the device; in fig. 2-10

device operation diagram. *

The device contains a pulse generator 1, the first element AND 2, the counter 3 pulses, the first control trigger 4, the serially connected lines 5, - 5 ^ delay, the first register 6, the first element OR 7, the second element OR 8, the second element 7 ment And 9, the second control trigger 10, the element is NOT 11, the second register 12, 20

the third element And 13, 'bus 14 "Start", bus 15 "Stop", bus 16 "Reset".

The output of the generator 1 pulses of the sub- ₂₅ keys to the input of the first element I 2, the output of which is connected to the input of the digital counter 3, the direct output of the first control trigger 4 is connected to the second input of the first element I 2, the output of the generator 1 of the pulses is also connected to the input of the first line 5,) delays from a group of successively connected lines 5 | - 5, ^. delays whose outputs are connected to the appropriate information 35

the inputs of the first register 6, the recording input of which is connected to the direct output of the first control trigger 4, the reset input of which is connected to the output of the first element OR 7, ⁴ θ the fault input of the first register 6 is connected o · the output of the second element OR 8, the first input of which is connected to the output the first element And 2. The direct output of the first control trigger ⁴ 5 Gera 4 is connected to the first input of the second element And 9, the second input of which is connected to the output of the second control trigger 10, the reset input of which is connected to the output of the generator 50 of pulses which is also connected to the input element NOT 11.

The output of the second element And 9 is connected to the input of the second register 12, the information inputs of which 55

connected to the outputs in series, connected. No - delay lines 5 /, I 5 2 Element NOT 11 output

• connected to the first input of the third element And 13, the output of which is connected to the installation input of the second control trigger 10, the second input of the third element And 13 is connected to the Start-up bus-14, which is also connected to the installation input of the first control trigger 4.

Bus 15 "Stop" is connected to the first input of the first element OR 7, the second 'input of which is connected to bus 16 "Reset", which is connected to the reset inputs of the digital counter 3 and the second register 12, as well as to the second input of the second element OR 8.

The numbering of the diagrams (Fig. 2) corresponds to the outputs of the elements with the corresponding numbers.

The device conversion time intervals in the code works as follows.

. Before the conversion, the elements of the device are reset to the initial state by applying a pulse through the bus 16 "Reset". The reset pulse through the first element OR 7 is fed to the reset input of the first control trigger 4, confirming its initial state. The reset pulse is also fed to the fault input of the counter of 3 pulses, the fault input of the current register 12 and through the second element OR 8 to the input, the reset of the first register-. 6. Pulses from the generator 1 'output are fed to the reset input of the second control trigger 10. The information inputs of the first and second registers 6 and 12 are closed, since there are no signals at their “Record” inputs from the direct outputs of the flip-flops 4 and 10, respectively. On the "Start" signal

(bus 14) the first control trigger flips over. 4. If the “Start” signal does not coincide with the counting pulse of generator 1, then the third element I 13 through the potential open from the output of the element 11 doesn’t reach the installation input of the second control trigger 10 and overturns it. The potential from the direct output of the first control trigger 4, the incoming input "Record" of the first register 6, the information inputs of the last open, and the delayed counting pulses from line 5, - 5 _{tons of} delay start to flow into the first register 6. At the same time, the potentials

3, 1193823

from the direct output of the first control trigger 4 and the second control trigger 10 is fed to the inputs of the second element AND 9. At the output of the second element And 9, a potential appears, which is fed to the input "Record" of the second register 12, and delayed pulses of the generator 1 from the outputs of line 5, -5 ^ delays begin to flow into the second register 12.

The appearance of a potential at the output of the first control trigger 4 after the “Start” signal arrives, leads to the opening of the first element I 2, and the counting pulses from the generator 1 begin to flow through the first element AND 2 to the input of the counter 3 pulses. -.

The first counting pulse after the pulse "Start" from the bus 14 from the output of the generator 1 pulses the second control trigger 10 returns to its original state, the potential from the output of the second element And 9 is removed, the information inputs of the second register 12 are closed. The same pulse, which passed through the open first element AND -2, the second element OR 8, sends information in the first register 6, but since the potential at the "Record" input of the first register 6 is present, the recording of the pulses from the line outputs begins again 5, - 5 ^ delay. This cyclical process continues until the “Stop” impulse arrives from the bus 15.

If the “Start” signal coincides with the counting pulse, then the second control trigger 10 does not overturn and there is no potential at the output of the second element 9. Information in this case is not recorded in the second register 12.

When a pulse arrives on bus 15 "Stop", the first control trigger 4 returns to

initial state, first element

And 2 closes, informational

the inputs of the first register 6 are closed by removing the potential from the entrance of “Za5 Pis”. From this moment the flow of counting pulses to the transmitter 3 and to the fault input of the first register 6 is stopped. Pulses from the output of the lines

5 ₍ - 5 _{tons of} delay in the first register 4

10 are not recorded. Same moment

time interval conversion to code ends. The counter of 3 pulses records the result of a rough conversion with accuracy.

15 to the period T _about . sequence of counting pulses. In the first register

6, the result of the transformation of the time interval 4 С ₂ (Fig. 2) is recorded, and in the second register 12 20, the result of the conversion of CI, due to the non-synchronism of the beginning of the time interval and the counting pulses. Both time periods

C and DC _{2 are} transformed with exactly 25 with _{30 |} d, determined by the delay time of the counting pulses in one line 5 delay.

Thus, the proposed device realizes the accuracy, op ₃ 0, which is determined by the delay time in one delay line 5. Amount | bits of registers 6 and 12 depends on the number of delay lines 5, which can be estimated by the formula

and * v / ·

З 'zcha

The time interval is determined by the number of pulses Ν _ο , Ν ₂ , Ν ^ recorded in the counter 3, in registers 6

40 and 12 respectively

4 = ί ^Ν ο * 0 T _o + y1, + 4½ ”(Ν _β -ΐ) Τ _β +.

where Ν | - number of units, record · ’

45 toilets in register 12;

Ν _ζ - the number of units recorded in register 6,

1193823

I 1 I I Ί 1 1 ... 1, 15 one · ! 1 1 1 I I ( s 1 1 T 1 1 ί 1 1 I 1 1_1 1 ι] ι

* g— - one n | - 9 one- 3 I I 1 I with 1 N at and

ΛβΖ *

Claims (2)

A TIME TRANSFORMATION DEVICE IN THE CODE containing a pulse generator, the first element I, a pulse counter, the first control trigger, a group of series-connected w delay lines, the first register, the output of the pulse generator is connected to the input of the first delay line and to the first input of the first element I, the second input of which is connected by the direct output of the first control trigger, the installation input of which is connected to the Start bus, the output of the first element I is connected to the input of the pulse counter, the outputs of the delay lines are connected to the corresponding information inputs of the first register, bus "Reset" is connected to the reset input of the counter, characterized in that, in order to improve the accuracy of the conversion, the element NOT is entered, the first and second elements OR, the second and the third elements are AND, the second control trigger, the second register, the output of the generator. Pulses are connected to the input of the element NOT and the reset input of the second control trigger: the generator whose direct output is connected to the first input of the second element AND, the second input of the second element AND connected to the direct output of the first control trigger, and the output of the second element I is connected to the Record bus of the second register, the input Reset of the first control trigger is connected to the output of the first OR element, the first input of which is connected to the bus Reset ¢ 3 and the second to tire e "Stop", the output of the element is NOT connected to the first input of the third element And, the second input of which is connected to the bus "Start", the output of the third element And connected to the installation input of the second control trigger, the output of the first element And connected to the first input of the second element OR the second input of which is connected to the bus "Reset", and the output of the second element OR is connected to the input "Reset" of the first register, the input "Reset" of the second register is connected to the bus "Reset", the outputs of the delay lines are connected to the corresponding information inputs of the second register, The direct output of the first control trigger is connected to the "Write" bus of the first register. 5Ц p „1193823 one 1193823 2