SU1665514A1 - Unipolar-to-bipolar code translator - Google Patents

Abstract

The invention relates to automation and computing and can be used in input-output devices for digital information transmission systems. The purpose of the invention is to simplify and expand the field of application of the converter by increasing the range of operating frequencies and loads. The converter of the unipolar code into bipolar contains a source of power 1, converters 2, 3 levels, keys 4-7 and restrictive elements 8-11. 2 Il.

Description

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The invention relates to automation and computing and can be used in input-output devices for digital information transmission systems.

The purpose of the invention is to simplify and expand the field of application of the converter by increasing the range of operating frequencies and loads.

FIG. 1 shows the functional diagram of the code converter; in fig. 2 - time diagrams that show his work.

The converter of the unipolar code into bipolar contains a power source 1, converters 2 and 3 levels, keys 4-7, restrictive elements 8-11.

The device works as follows.

When a code pulse is applied (Fig. 2, but a moment) to the input of the device (Fig 1), it is fed to the input of the level 2 converter and to the control, input V of key 4. From the output of the level 2 converter this pulse is converted to the specified level , is fed to the input (base-emitter) of the key 6 and through the open transition of the emitter-collector of this key - to the output to the devices (FIG. 2, in, moment Ti). Simultaneously with the OUTPUT of the key 4, this pulse, converted into a pulse of negative polarity, is fed to the second output of the device (Fig. 2, g, moment of Ti),

When a zero-level pulse converter is applied to the input (Fig. 2, a, time Ta), zero-level pulses are also generated at the outputs of the transducer (Fig. 2, c, time Ta) and (Fig. 2, d, time Ta) as in doing so, the level converter 2 is locked, the keys 6 and 4.

At times Tz and T4 (Fig. 2, a) at the input of the device, the processes are similar to those discussed above.

Thus, each code pulse arriving at the converter a input (FIG. 2, a) generates positive polarity pulses at output c (Fig. 2, c) and negative polarity pulses at output g (Fig. 2, d) converter,

When a code pulse is fed to the input b of the device (Fig. 2, b, moment TB), it enters the input of the level 3 transducer and the control input V of the key 5. From the output of the level 3 transducer, this pulse, converted to the specified level, goes to the input (base-emitter) of the key 7 and 1 through the open transition of the emitter-collector of this key to the second output of the device (FIG. 2, g, moment Tz).

From the output of the key 5, this pulse, converted into a negative pulse, arrives at the output to the devices (Fig. 2, c, moment Ts). When a zero level device is fed to the input b (Fig. 2, b, time T4), a whig is formed at its outputs

also zero-level pulses (fig. 2, t, time T / 1 and fig. 2, moment T4), since in this case the level converter 3 is locked, keys 7 and 5. Keys 6 and 7 together with elements 10 and 11 serve for

0 to reduce losses when transmitting to outputs b and g of pulses of a code of positive and negative polarity and to prevent their mutual influence.

Thus, every impulse code.

5 arriving at the input b of the device (Fig. 2, b), generates a pulse of negative polarity at output c (Fig. 2, c) and a pulse of positive polarity at the output g of the device (Fig. 2, d).

0 As a result, when applied to inputs a and b

The converter of unipolar codes (Fig. 2. a and 2, b) at its outputs a bipolar three-level codes (Fig. 2, c and 2, d) are formed to transmit information over a two-wire interference-free communication line.

Since the converter has no lumped (inductances in its composition, the conversion of unipolar codes into bipolar codes is possible in a wide range of clock frequencies of the codes without distorting the shape of the pulses.

Claims (1)

Invention Formula 5 Converter of unipolar code into bipolar, containing first, second, third, and fourth keys, first, second, third, and fourth limiting elements and a unipolar power source, 0 the first output of which is connected to the common bus, the first terminals of the first and second keys are the first and second inputs of the converter, respectively, the first and second terminals of the third and fourth keys are connected to the first terminals of the first, second and third, fourth limiting elements, respectively, the third output The third key is the first output of the converter, which differs from the fact that, in order to simplify and expand the range of application of the converter by increasing the range of operating frequencies and loads, in introduced first and the second level converter, 5, the power source is bipolar, the first terminals of the first and second level converters are connected to the first terminals of the keys of the same name, the second output of the power source is connected to the same terminals of the first and second keys and level converters of the same name, the third and fourth outputs of which are connected respectively to the first output of the power source and to the second outputs of the third and fourth keys, respectively, the third output of the power supply is connected to the third and fourth outputs of the first and second keys, the second outputs of the first and second restrictive keys 0 elements are connected to the first output of the power source, the fifth output of the second key and the second output of the third limiting element are connected to the third output of the third key, the fifth output of the first key is connected to the third output of the fourth key and the second output of the fourth limiting element and is the second output of the converter.