SU467461A2 - Code converter - Google Patents

Description

(54) CODE-VOLTAGE CONVERTER

3

go voltage / 7od. - with terminal 19, with inversion of the input of the differential operational amplifier 10 and with inverting input of the differential operational amplifier 11. The voltage, ,,, of an additional source of voltage, is applied to terminal 20 connected to the inverting input of the differential operational amplifier 10.

The current through the open key transistor of each of the high-order bits of the converter is the sum of three components: the discharge current, depending on the discharge resistor of the decoding grid (2R) and the potential difference of the output of the non-discharge switch, and the corresponding node point of the decoding grid, potential which is determined by the code to be converted; a long-range current, depending on the potential difference of the outputs of the discharge switch and the corresponding operational amplifier 5 or 6 and the values of the resistors 7 and 8; of the compensating current determined by the potential difference of the outputs of the main and additional polarity switches and the values of resistors 15 and 16. Its value is for the / -th discharge

/ ii fvi - {- fni - {- ft: i,

“.

discharge current / –HO output 2R random switch;

additional

“, T / ,,, t /,.,.,. 5 / -H of the discharge Tiepe key a tel;

J Oh,.; / ,,.,. F / ,, b, lio-f (I-a, 0 biy

 R,

kompepsiryuhpy current / th discharge switch;

, - is the bit coefficient of the i-th bit; Li is the potential of the nodal point of the ith bit; / 7 is the resistance value of the resistors 7 i 8; . - resistance value of resistors 15

and 16;

Sinih 5th (Li-f / iibixg) - | -i7iii.ixg - output circuit of operational amplifier 5 (6); UsuxiQ k (U4, f, - bcd.) - | -f / o.v - output voltage of the operational amplifier 10;

Uabixii k (UoxUal.) - -Uituxi2 EXIT

strained op amp 11; t / ijLixg, (/.ibix|2 - output lines resistor dividers 9 and 12;

four

k - coefficient. transmitting amplifiers 5, 6, 10 and 11.

When and k - 1 goes

  2a; (At „„, - {/ о, „2R

When /: ,, - L,

2R Wom

When a, - 0 A ,; - 2R

That is, the current through the open key transistor of the switch does not change and does not depend on the value of the varying reference voltage Uox, but has a constant value determined by the value of the voltage Uom and the resistance value of the discharge resistors of the decoding grid.

Subject invention

Code-converter converter on aut. St. No. 365827, characterized in that, in order to maintain the current switched by the switch, when the input voltage and the reference voltage change, it contains a additional voltage source, as well as two differential operational amplifiers and for each of the high-order bits of the additional transistor switch , one of the inputs of which is connected to the output of one differential operation of the amplifier, another input to the output of another differential operational amplifier, the control input of the auxiliary The transistor switch is connected to the control input of the corresponding main transistor switch, the output of the additional transistor switch is through a 2R resistor, connected to the output of the main transistor switch, the inverting input of one differential operational amplifier is connected to the source of the reference voltage, the non-inverting input is through appropriate resistors with a common bus and a donor voltage source, and the inverting input of the other is differential th operational usilite.1 istochiikom connected to the additional voltage, a non-inverting input - with a source of reference voltage papr. - OGG n Pg - a, oh oh,