SU666640A1 - Analogue-digital converter - Google Patents

Description

(54) ANALOG-DIGITAL CONVERTER

Connected to the control inputs of the control unit.

Fig, I shows the structural electrical circuit of the device; in fig. 2 — temporal daagrams explaining the transformation process,

The analog-to-digital converter contains a pulse generator. 1, gating and storing device 2, comparison device 3, control unit 4, linear-varying voltage generator 5-7, charge current source 8, discharge current source 9, centiles 10-15, comparators 16, device 17 information 4 and the device 18 reset.

The device operates as follows. In accordance with the signals generated by block 4, alternating charge and discharge of generators 5-7 linearly varying voltage from sources 8 and 9 occurs. At time ti, corresponding to the arrival of the next strobe pulse to device 2 and to the input of block 4, block 4 generates a signal that opens the valve 10, and a generator of linearly varying voltage from source 8 is charged. By the time tj, the generator of linearly varying voltage is charged to a voltage . equal to the voltage at the output of the device 2, after which the device 3 is triggered. In accordance with the signal of the device 3, the block 4 generates, according to a certain algorithm, the signals that turn off the valve 10 and turn on the valves 13 and 11. When the valve 13 is open, the generator 5 is linear - variable voltage from source 9, and since valve 11 is also open - linear alternating voltage generator charge 6 from source 8. At time point 1e, one of the comparators 16 connected to the output of alternating voltage generator 5 same and fixing the value of the voltage at its output, will change its state, unit 4 in accordance with a certain algo {iggm generates signals that turn off valves 13 and 11, turn on the valves 14 and 12. One of the signals of unit 4 excites device 18, which gives signal for resetting the generator of linear-varying voltage 5,

Thus, the voltage difference at times t j is detected by the generator of linearly varying voltage. Further conversion of the voltage occurs by analogy with the above description of the operation of the converter for one clock cycle.

The essence of the analog-digital conversion method is to follow.

Let there be a single sampling of the analog signal, which must be represented by a digital code (Fig. 2). At the time of time.

t, a generator of linearly varying voltage from a charge current source occurs. By the time tj, the generator of linearly varying voltage is charged to DO, and from that moment the discharge of the generator of linearly varying voltage from the current source of discharge and the charge of another generator of linearly varying voltage from the source of current yes, At time t3, the value of the voltage UQ will be determined with the precision of the P-grid discrete, and the conversion error, i.e., the voltage difference U (tj) -U (t3) due to the discrete P-grid will be fixed by the second generator linearly varying voltage NPA in time.

Claims (2)

1. Gitis E, T. Transformers information format for ECTV,, M-. Energie, 1970, p. 335-350. 2. Information converters in analog-digital devices and systems, ed. G, N. Petrova, M., Maschiyostroenis, 1973, p. 210.