SU1599872A1 - Code-controlled resistance module - Google Patents

Abstract

The invention relates to automation, computing and information-measuring equipment and can be used, in particular, in hybrid computers, code-controlled resistance measures. The purpose of the invention is to simplify the block and expand its scope. The code-controlled resistance unit contains an element with adjustable conductivity, two operational amplifiers 4 and 5, eight scale resistors 6–13. The use of element 3 and additional scale resistors simplify the design of the block by reducing the number of active components and using the element of adjustable conductivity with grounded output. The possibility of obtaining active or reactive output conductivity of the unit expands its scope. 1 hp ff. 2 Il.

Description

FIG. /

3, 1599872 The invention relates to automation, computing, information and measuring technology and can be used, in particular, in flexible computers, code-controlled resistance measures.

The purpose of the invention is to simplify the block and expand its scope. Figure 1 is a block diagram of a co-guided resistance; figure 2 is a diagram of an embodiment of an element with adjustable conductivity, having a grounded circuit

ten

18 - code control emg resistive matrix (in particular, type R-2R), 19-22 - scale resistors; 23 is a feedback resistor matched in resistance with matrix resistors R-2R. Elements 17, 18, and 23 form a standard multiplying digital-analogue converter. An analog voltage multiplier may be used instead, one of the inputs of which is used as a control input. Equivalent conductivity G (14, 15)

 viv,. Lt} ijt V 14, I J /

The device (Fig. 1) contains: ext. bridle conclusions 14 and 15 elements

ml, those TaLTorkrTE.t "o T" - -.

analog outputs pins 1 and 2,

-Tt

weighted relatively common bus unit, the element 3 with adjustable conductivity, operational amplifiers 4 and 5, large-scale resistors 6-13.

The device according to the scheme in figure 1. works as follows.

For simplicity, we assume that operational amplifiers 4 and 5 correspond to the ideal model, and the resistances of resistors 6–13 are equal, i.e. R R, R Ra R, 0 R,. R, R.

equals:

G (14, 15) -R2, (R

20

)

N R, / (,

2) (1)

Where

R

25

8 -9 10 "tl" 12 13

- R. In this case, the unit can be; to look at the mutual connection of two gyrators, if it is noted that element 3 has a negative conductivity component, is equal to -2 / R. The outputs of the gyrators relative to the common: bus (analog ground) block are respectively the non-inverting inputs of operational amplifiers 4 and 5. If the total conductivity C of element 3 relative to the common bus of the block is G 1 / Z - 2 / R, where Z is an adjustable value, then According to the theory of gyratory circuits, the resistance of EE between conclusions 1 and 2 is: Zg RVz. Thus, for the implementation of the block, it is necessary, along with positive

35

N is the transfer coefficient of the digital-to-analog converter; (9 22 resistances of the respective resistors.

As can be seen from expression (1), an element with adjustable conductivity allows linear changes in the positive conductivity and provides a negative unregulated component of the total conductivity G (14, 15).

For this case, the equivalent block resistance (between outputs 1 and 2) is

B

N.R Ri, / (R ,, - R2p ..

(2)

40

If a capacitor or an inductor is used instead of resistor 19, then the possibility of digitally adjusting the reactive component is necessary.

For the operability of the code block - (7TG -f.-r - J - i-i. Wvt hh.i.H, H-, 1HL I P lS.JfJ, J

guided (1 / Z) to have a negative dd of controlled resistance is necessary

unregulated (-2 / R) conductivity component of element 3.

To obtain the reactance Zj, it is necessary to have the reactive conductivity of the element 3. The value of the reactive conductivity can be controlled by a digital code or voltage.

An element with adjustable conductivity () allows the implementation of code-controlled conductivity. In figure 2, the following symbols are introduced: 14 and 15 - external signals of analog signals; 16 and 17 are operational amplifiers;

fulfillment of the equality 2 / R X R, -).

R., / (X

 2 "

20

ha50

55

In addition, the considered block reverses the nature of the reactivity of element 3. For example, if the output conductivity of element 3 has a capacitive character, then the output conductivity of the block (between conclusions 1 and 2) is inductive in nature and vice versa.

Claims (2)

Formula Fig. eteny 1, Vlok kodoomanavlivaemy resistance, containing three large-scale 0 18 - code control emg resistive matrix (in particular, type R-2R), 19-22 - scale resistors; 23 is a feedback resistor matched in resistance with matrix resistors R-2R. Elements 17, 18, and 23 form a standard multiplying digital-analogue converter. An analog voltage multiplier may be used instead, one of the inputs of which is used as a control input. Equivalent conductivity G (14, 15) viv,. Lt} ijt V 14, I J / bridle conclusions 14 and 15 elements 15) -R2, (R 20 ) N R, / (, 2) (1) Where R N is the transfer coefficient of the digital-to-analog converter; (9 22 resistances of the respective resistors. As can be seen from expression (1), an element with adjustable conductivity allows linear changes in the positive conductivity and provides a negative unregulated component of the total conductivity G (14, 15). For this case, the equivalent block resistance (between outputs 1 and 2) is B N.R Ri, / (R ,, - R2p .. (2) If a capacitor or an inductor is used instead of resistor 19, then the possibility of digitally adjusting the reactive component is necessary. For the operation of the block code. -R - J - i-i. wvt h-h..i.CH, H-, 1CHL I P lS.JfJ, J controlled resistance needed dd controlled resistance needed fulfillment of the equality 2 / R X R, -). R., / (X  2 " 20 ha50 five In addition, the considered block reverses the nature of the reactivity of element 3. For example, if the output conductivity of element 3 has a capacitive character, then the output conductivity of the block (between conclusions 1 and 2) is inductive in nature and vice versa. Formula Fig. eteny 1, Vlok kodoomanavlivaemy resistance, containing three large-scale a resistor, the first of which is connected to the first analog output of the block, and the second output to the output of the first operational amplifier and the first terminal of the second large-scale resistor, the third large-scale resistor connected to the second output of the second analog output of the block, and the second output to the second output operational amplifier, characterized in that, in order to simplify the unit and expand its application area, fourth to eighth scale resistors and an element with adjustable conductivity are introduced into it, Why does the first operational amplifier are connected with a non-inverting input to the first analog output of the unit and the first output of the fourth scale resistor, and the inverting input to the second output of the second scale resistor and the first output of the fifth scale resistor, the second output of which is connected to the first output of the sixth resistor and the first output of the element with adjustable conductivity, connected by the second output to the zero potential bus, the second view of the fourth large-scale resistor and the first outlet with d99872 ten five 20 25 thirty a second resistor whose second output is connected to a second analog output, a block and a non-inverting input of a second operational amplifier connected by an inverting input to a second output of a sixth large-scale resistor and the first output of an eighth large-scale resistor connected to the output of the second operational amplifier. 2. The unit according to claim 1, characterized in that the element with adjustable conductivity contains a multiplying digital-analog converter, four large-scale resistors and an operational amplifier, which is connected with a non-inverting input to the first output element and the first terminals of the first and second large-scale resistors, with an inverting input to the first conclusions of the third and fourth large-scale resistors, and the rise to the second outputs of the second and fourth large-scale resistors and the auxiliary input of the multiply digital-to-analogue converter, which is connected to the second terminal of the first scaling resistor, the second terminal of the third scaling resistor connected to the second terminal element.