SU327600A1 - CONVERTER CONNECTING TO VOLTAGE UNDER VOLTAGE CODE - Google Patents

Description

The invention relates to the class of digital-to-analog converters and can be used in the systems of information-measuring equipment and automatic control.

Converters of the alternating code to voltage, bit discharge triggers, sign bit trigger, current sources of bits, current switches, and summing resistors are known.

In order to improve the conversion accuracy in the proposed converter, the emitters of the transistors of the current switches are connected to a current source of discharge, and the collectors are combined with collectors of transistors, the bases of which are connected respectively to the zero outputs of other discharge triggers and to a single sign trigger output other bit triggers and to the zero output of the sign trigger, in two soils, each of which is connected to a common bus through summing resistance.

The drawing shows a functional diagram of the device.

The converter consists of a Uziak trigger, bit triggers 2, transistors 3 to 4 current switches, sources 5 of current bits, source 6 of the sign bit current, and summing resistors 7 and 8.

The sign trigger and each of the bit triggers control two transistors 3 and 4 of the current switch. If the bit trigger is in the "zero" state, the current generated by the source 5 passes through the transistor 4 and the summing resistor 7. If the sign trigger is in the "zero" state, the current created by the sign 6 source of the current 6 passes through the transistor 5 and a summing resistor 8. The currents of the discharge sources corresponding to the state of "zero bit triggers, and the source current of the sign bit corresponding to the state of" bullets of the sign trigger, flowed through the summing resistors 7 and 8, create a voltage drop at points 9 and ten.

The output voltage of the proposed variable-to-voltage code converter is determined by the voltage gts as the potential difference at these points of the L / Q-Uio Cres.

For 77-bit convertible code

", SI / 2

where / is the current value.

R is the resistance of resistors 7 and 8 (P7 R & R), Li is the coefficient taking into account the meaning of the codes in the sign and other bits, n is the number of bits.

the output of the converter has a negative sign and is proportional to the code being converted

U „,„ 2 /// 2 / ,, - 2. .

Thus, the conversion of the alternating code into a voltage is carried out using a reference voltage source of one polarity, and, moreover, correct decoding of the negative and positive "zero does not require a correction bit, as in the case of code 00 ... O n in the case of code 11 ... O {Ush „x 6.

Subject invention

 Converter alternating code to voltage containing bit triggers,

Signature discharge trigger, discharge current sources, current switches, summing resistors, characterized in that, in order to increase conversion accuracy, the emitters of the current switch transistors connect the current source to the discharge source, and the collectors are combined with collectors of transistors, the bases of which are connected respectively to zero outputs of other bit triggers and to a single output of the sign trigger, to single outputs of other bit triggers and to a zero output of the sign trigger. into two groups, each of which is connected to a common bus through a summing resistance.