SU1580558A1 - Code-to-voltage converter - Google Patents

Abstract

The invention relates to computing and measurement technology and can be used to create control systems for metrological characteristics. The purpose of the invention is to increase the conversion speed. The code-voltage converter contains a pulse generator, a pulse counter, a code comparison unit, a pulse shaper, an exemplary voltage source, three keys, two filters, and a NOT element. The transducer's operation is based on analyzing the difference between the output signal before the conversion and the signal resulting from the conversion by connecting the high-order bit of the input code to the control input of the key connecting the output of the corresponding filter output. 2 Il.

Description

The invention relates to computing and measuring technology and can be used in the development of high-precision digital-analog and analog-digital converters and sources of calibrated signals from digital measuring instruments.

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

Fig. 1 shows a structural electrical circuit of the converter code - voltage} in Fig. 2 - timing diagrams explaining the operation of the converter.

The converter code - voltage contains a generator of 1 pulses, a counter of 2 pulses, a block 3 of comparison of the codes of the s driver 4 pulses, a source 5 of the reference voltage, the first b and second 7 keys, the element HE 8, the first 9 and the second 10 filters, the third key 11 , bus 12 input code and output bus 13.

Converter code - voltage works as follows.

The TG of the initial state on the input code 12 buses, the code 00 ... O is present. The input of the first filter 9 through the first key 6 is connected to the tire of zero potential (common bus), the input of the second filter 10 through the second key 7 is connected to the source 5 of the model sample

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go voltage The output of the first filter i 9 is connected via the third key 11 to the output of the converter code - voltage. When the input code on buses 12 is less than 100 ... O (for example, 011 when), the n-th bus bit is in the logical zero state and the third key 11 retains its state. The pulse counter 2 counts the pulses (Fig. 2, and from the pulse generator 1, and at the time of equality of the code to be converted and the code on the second information outputs of the pulse counter 2, the code comparison unit 3 generates a signal (Fig. 2, b), which translates driver 4 pulses in a single logical state. The pulse generator is returned to its original zero state by a transfer pulse from the first output of counter 2 (Fig. 2, c). The pulse duration from the output of the pulse generator 4 is proportional to the code being transformed. from the pulse controls the voltage connection from the source 5 of the reference voltage to the first filter 9. This pulse is also inverted by the HE element 8, the signal from the output of which (FIG. 2, e) controls the connection of the common bus to the input of the second filter 10. In the diagrams e and g (Fig. 2) shows the change in the output of the first and second filters, respectively .The voltage transient, proportional to its code 011, ends faster at the output of the first filter 9, the output of which is connected to the output bus 13 of the converter through the thirdspanner 11.

If a code equal to or greater than 10 ... O (for example, 110) goes to the input code buses, then the logical unit of the most significant bit of the code to be converted, which controls the third key 11, connects the code to the output of the converter — the voltage of the second filter 10. In this case, the operation of the pulse generator 1, the pulse counter 2 (Fig. 2, the diagram-transfer pulse at the first counter output), the code comparison unit 3 (Fig. 2, the diagram and the signal at the output of the code comparison unit 3) Forming 4 pulses (figure 2, diag0

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ma to - the signal at the output of the driver 4 pulses), the element is NOT 8 (figure 2,

L diagram - signal at the output of the element NOT 8) is similar to that indicated in the previous case. The min diagrams (Figure 2) show the voltage change at the output of the first and second filters, respectively. In this case, the voltage at the output of the second filter 10, and hence the voltage at the output of the converter code - the voltage is established faster than the output of the first filter 9, since the transient process ends faster.

Claims (1)

Invention Formula The converter code is a voltage containing a source of reference voltage, a first filter and a code comparison unit, the first inputs of which are the corresponding input code buses, and the second inputs are respectively connected to the information outputs of the pulse counter, the counting input of which is connected to the output of the pulse generator, and the transfer output is connected to the first input of the pulse generator, the second input of which is connected to the output of the code comparison unit, characterized in that, in order to increase the speed of the converter , the first, second and third keys are entered into it, the second filter and the NOT element, whose input is combined with the control input of the first key and connected to the output of the pulse former, and the output connected to the control input of the second key, the first information input of which is combined with the first information input the first key, and is the zero potential bus, while the second information inputs of the first and second keys are combined and connected to the output of the reference voltage source, and the outputs are respectively connected to the inputs of the first first and second filters, whose outputs are respectively connected to first and second data inputs of the third switch, whose output is the output bus and a control bus input is the most significant bit of the input code.