SU748453A1 - Scale-time converter - Google Patents

Description

one

The invention relates to the field. automation and radio metering technology and can be used to convert the time scale j of repetitive electrical signals in various kinds of automated measuring systems.

Known scale-time converters.

One of the known transducers contains a broadband amplifier with a regulating element, a comparator converter, whose input through a switch is connected to a model voltage source and output, to a broadband amplifier, a fixing element, a key, memory elements, regulating elements and an adder 1.20

 The disadvantage of such a converter is the large error and narrow frequency band of the conversion.

The closest technical solution to this invention is a 25 scale-time converter, containing a mixer, the first input of which is an input of the converter, the second input of the mixer is connected to the output of a diffracted analog output unit.

conversion, and the third to the output of the strobe pulse generator, the output of the mixer is connected to the input of the pulse amplifier, the storage register of the measurement results and the scan unit ((and 2.

In this converter, when measuring each point, sequential codes are formed that control the digital-to-analog conversion unit. Since at each gating, as a result of comparing the input signal and the feedback voltage, only the signal more, less is formed, the process of working out the compensation voltages begins with a well-defined code, regardless of the input signal level. In other words, the measurement time of each point is not determined by the level of the signal under study at the readable points, but by the number of bits of the digital-analog conversion unit and its speed.

However, the constantly increasing requirements for increasing the rate of study of electrical signals necessitate an increase in the rate of measurement of such devices while maintaining

The main advantages are high measurement accuracy.

The aim of the invention is to improve the speed of the converter.

The goal is achieved by the fact that the temporal mastab converter contains comparators according to the number of digits of the measurement results storage register and the decoder, the input of the strobe pulse generator is connected to the control output of the decoder through the scanner, and the output of the strobe pulse generator is connected to the decoder clock input, the signal inputs through appropriate comparators are connected to the output. the house of the pulse amplifiers, and the decoder outputs are connected to; and the corresponding inputs of the measurement results storage register, whose outputs are the digital outputs of the converter and connected to the corresponding inputs of the digital-analog conversion unit, the output of which is the analog output of the converter.

FIG. 1 shows a diagram of a converter made according to the invention; in fig. 2 - result and threshold characteristics of comparators.

The numbers on (lig. 1 denote: mixer 1, pulse amplifier 2, comparators 3, decoder 4, storage register of measurement results 5, digital-to-analog conversion unit 6, strobe pulse generator 7 and scanner 8.9 - converter input, 10 - analog, 11 - digital converter outputs.

The number of comparators is equal to the number of bits of the register of storage of measurement results 5 and the number of bits of the block b. The trigger threshold cf of each / comparator is chosen so that the cut-off & threshold threshold has the form of Figure 2, where N is the number of bits of block 6.

The Converter operates as follows. „: ......; -, ..

At the initial moment of time, the voltage of either the output of the block b is zero. C-arrival at the input of the mixer 1 of the signal under study and at its strobiro; At the first point in the code of mixer 1, an extended pulse arises with an amplitude proportional to the input signal at the read point. Let O. In this case, an extended impulse of positive polarity is formed at the output of mixer 1. Reinforced by amplifier 2, the extended pulse arrives at the inputs to ports of 3, causing the first K comparators to operate. A signal of the type ShZhTTL T1 G, will be sent to the starter decoder 4. . G .-. PG-g.

748453

Under the action of this decryption signal, the torus 4 generates a signal

N

ShzO. . . J .. and puts the unit in

, -. to

The kth bit of the register of storage is 5 .. From the output of register 5, signal 000. . . 1000,. O is supplied to block 6, at the output of which a constant voltage is generated, corresponding to the weight current of the K-th discharge. During the second cycle, the same point of the signal under investigation is c-foped. If the magnitude of the signal at this point is greater than the voltage at the output of block b, then a positive extended pulse arises with an amperage proportional to the difference of these voltages

Since the amplitude of the extended pulse at the second gating is less than at the first, after it passes through the Circassian amplifier 2, the comparators 3 are working, and K. In this case, the signal, from the decoder 4, goes to the storage register 5. N

000 . ..1000 .. .S. There is a recording of the units-- ..

in i-Pi is the storage register bit. Thus, the output of the register will be a signal

, -. - .- -; ,

000 .-. Go. . ..010. TRP Voltage on lt. . -Tg f

The unit 6 will be larger by an amount corresponding to the weight current of the discharge. The process of reading the first point ends under the conditions that the extended pulse will be less than the threshold of operation of the comparator 3 with the minimum threshold of operation.

.{cm. FIG. 2). In this case, the decoder 4 issues a command to the scanner 8, which shifts the strobe relative to the signal by the read step and the second point is read. If the value of the signal in the second point is the same as in the first one, the extended imyuls is absent and the decoder 4 issues a command to read the third point and so on.

With Ug, O, the reading process is carried out in a similar way, with the only difference that in this case, in the corresponding storage category 5, zero will be recorded.

Thus, in the developed converter, the measurement time of the signal decreases with its slow change. The gain in measurement speed increases with the number of bits of the digital-analog conversion unit b and is equal to about 10 with a 10-bit digital-analog conversion unit b. At the output of block b, an analog voltage is generated, which can be used to record the signal on the oscilloscope, and at the output

register 5, we have a digital code corresponding to the magnitude of the signal at the points of reading. This information can be used for secondary processing on a computer. Along with a high measuring speed, the transducer is characterized by considerable simplicity and low cost.

Claims (2)

 Invention Formula A temporal transducer containing a mixer, the first in which is the converter input, the second mixer input is connected jc to the output of the digital-analog conversion unit, and the third to the output of the strobe pulse generator, the mixer output is connected to the input of the pulse amplifier, the measurement result storage register and the scanner, that, in order to increase the speed of the converter, it contains comparators in the number of bits of the register of measurement results and a decoder, moreover the input of the strobe pulses generator is connected to the control output (the decryptor output, and the output of the strobe pulses generator is connected to the synchronization input of the decoder, the signal inputs of which are connected to the output of the pulse amplifier through the corresponding comparators, and the outputs of the decoder are connected to the corresponding inputs of the measurement results storage register whose outputs are digital outputs of the converter and connected to the corresponding inputs of the digital-analog conversion unit whose output is Analogue output pre-lagger, Sources of information, taken into account in the examination of i 1. USSR Copyright: № 291336, class. About T 3/00, 1969., 2. USSR author's certificate iw292172, class G 06 J 3 / 00,1967 (pro; otip). I I