SU828405A1 - Analogue-digital converter - Google Patents

Description

amplifiers can be arbitrary. However, it is more expedient to choose their number to be equal to a, where a can accept values equal to 2, 22, - 2 ... 2. In this case, all the nodes in the blocks and 2 will be of the same type. The number of blocks 3 in each group (except the last) is determined by the formula

-7 "

t - -.

but

In the last group it will always be one less, that is, equal to: but m and t-1.

Block 4 has 2 ™ calibrated negative polarity arrays of the same magnitude as Q 2Q, 3Q, and one 1Unol: voltage level

equal to 0.5Q, where Q and t / x ...; the maximum value of the input signal

UAi) W | I1frator is a known scheme, preassigned for obtaining a binary digital code N2 from a single NI code.

Analog-digital. Converter works as follows. The transformed Llx array (i is supplied to the first inputs of blocks 1, and the second inputs from block 4 are supplied with calibrated voltage levels, respectively, equal to the ground potential - the potential Q and the potential (2 ™ - 1) Q. (/) varies linearly (see Fig. 2, a). Then the incidence on one of the outputs of the block, / will be characterized by the value of /, (see Fig. 2.6) and the voltage on the other output of the block / - led by IJz (see Fig. 2, b). From these dependences it is seen that the first combined nonlinearity will have a zero dead zone efficiency, the second combined nonlinearity — ZO | Well, insensitivity is equal to Q, a third coherent nonlinearity (shown in Fig. 2) would have a dead zone equal to 2Q and so on. In the last combined linearity, the insensitivity zone will be () Q. the constraints in all cases will be the same and equal to either 0.5Q (for positive signals) or equal to O (for negative).

At the output of the combined linearities of blocks 1, there may be a Bozni: stick error b (. When limiting positive voltage levels) or error 62 (while limiting negative voltage levels). However, these errors will not affect the accuracy of information conversion, since an increase in positive voltages greater than 0.5Q represents: It goes beyond the permissible operating range, and the increments

voltages in the negative domain do not play waves, because the transducer converts the voltages of only one polarity (in this case, positive).

Subsequently, the block outputs / analog sipnals, amplified 2a times, are fed to the first inputs of the respective groups of blocks 5. The second inputs of blocks 3 are respectively supplied with calibrated levels equal to Q, 2Q, and. In those cases, when the voltage value of the first 1 inputs of blocks 3 exceeds the value of the second INPUT module, then such blocks 3 operate the unit code .V |, which goes to the encoder 5 and the IB binary code NZ is converted.

The most optimal variant of the structure of the device is when

the value of a, characterized by the number of combined n-linearities, is chosen to be 2 or close to this value.

The use of new BlokOBs in the device (blocks of zones of limitation and insensitivity and blocks of scaling devices) favorably distinguishes the device from the known, as it gives an opportunity to get an accurate digital readout on rough comparison and suction circuits, the number of calibrated levels; in the block of reference voltages.

Claims (2)

1. E. Gitis. Information converters for electronic digital computing devices. - M., “Energiya, 1U70, with. 53. 2. Konchalovsky B. Yu. And others. Electrical measuring instrumentation transformers. -M., “Energy, 1967, p. 301 (prototap).