SU1298777A1 - Function generator - Google Patents

Abstract

The invention relates to automation, analog and analog-digital computing and can be used in electronics and information and measurement technology. The aim of the invention is to extend the functionality by programmatically switching from one functional dependence to another. The goal is achieved by performing control unit 6 on two voltage-current converters 7 and 8, five switches 9-13, three summing scale amplifiers 14-16, three keys 17-19, digital switch 20, two decoding resistor matrices 21 and 22, an inverter 24 and a reversible counter 25. The block 28 specifying the function in accordance with the reproduced functional dependence switches the keys and switches of the control block 6. 3 il. b (/), N

Description

The invention relates to automation, analog and analog-digital computing and can be used in electronics, communications, acoustics, information and measurement equipment.

The aim of the invention is to extend the functionality by programmatically switching from one functional dependence to another.

FIG. 1 shows the functional scheme of the proposed functional generator (FG); in fig. 2 - timing charts of FG; in fig. 3 - table of reproducible functions and table of switch positions with

The functional generator comprises an integrator 1, a relay element 2, an electronic switch 3, outputs triangular 4 and rectangular 5 generator voltages, control unit 6 containing the first 7 and second 8 voltage converters — current, five switches 9–13, three sums - scale amplifiers 14-16, three keys 17-19, digital switch 20, two decoding resistor matrices 21 and 22, a clock input 23 of the control unit, an inverter 24, a reversible counter 25, an input 26 controlling the reverse of the counter, an input 27 for, generator cleanliness chambers, task block 28 kind of function.

Functional generator operates as follows.

When using the function type setting 28 using the appropriate buses, the switches 9-13 and keys 17-19 are set to the position corresponding to the implementation of the functional dependence F f Kx from the generator frequency setting input 27, the input value x (voltage) is fed through switches 11 and 13 and key 18 to the inputs of decoding resistor matrices 21 and 22. I

Denote the transformation coefficients of the corresponding elements 1, 2, ..., 25 of the scheme by K, K, ..., K.

55 ,,

If the control inputs of the decoding resistor matrices 21 and 22 are set to equal values of their resistances, which corresponds to the equality of the numerical values of the duration of the front T and the cutoff T of triangular pulses, then the transmission coefficients Кn. To 1C and K, K. J pos 14 7 j t5 8

The successively connected converters, respectively, 21, 14, 7 and 22, 15, 8 are the same.

In this case, the voltage from the output of the decoding resistor matrix 21 through the summing scale amplifier 14, the switch 9 goes to the converter 7, the voltage goes to the current, and from the code of the resistor matrix 22 goes to the converter 8, the voltage goes to the converter 8. - tone, forming the outputs respectively 1 - +1, 1 -I at the outputs.

When a high voltage level is applied from the output of the relay element 2 to the control input of the electronic switch 3, the capacitor of the integrator 1 is charged by +1 current through the electronic switch 3, forming the front of triangular pulses of duration T at the device output. At low voltage, the capacitor recharged with current -I, forming a pulse cutoff of duration T. Thus, self-oscillation occurs in the ring consisting of an electronic switch 3, integrator 1, relay element 2, and at the output 4 of the generator f rmiruyuts pulses symmetric triangular shape, and the output of 5 - pulses symmetrical rectangular shape.

For this mode of operation of the structure (Fig. 1), the pulse front duration T. is proportional to I / I, and the cutoff time T is proportional to / (,. The currents of the transducers 7 and 8 I and I, are in turn linear functions of the input quantity X (U. voltages). Considering equality

    I

(one)

the frequency of the generated pulses f has a linear dependence on the value of the input quantity x, which follows from this expression

f (2)

where K is a coefficient equal to the product of the transformation of the series-connected circuit elements.

The functionality of the function generator can be extended if the change in the coefficient K, the product K x or from the ratio is provided. We show the functionality of the device when playing functions in accordance with the table. 1 and 2 (Fig. 3).

When reproducing functions of the form F 2 and F, pulses with frequency f from the output 5 of the function generator, through the key 17, arrive at the counting input of the reversible counter 25 with a preset Y, forming at its output a linearly varying in time code

Y f-t (3)

The code arriving at the control inputs of the decoding resistor arrays 21 and 22 changes, respectively, the conversion factors of the links 21 14 and 22, 15 according to the expression

one

and 4th. (four)

where and is the output voltage of summing scale amplifiers 14 and 15. Taking into account (3) and (4), the voltage (1) will take the following form

f - K €

If one of the values of x and t is constant, we obtain the functional dependences of the form F, F.

By setting the key 17 to position B, the counting input of the reversible counter 25 from the output 5 of the generator is turned off. The change of the Y code at the input 26 is transmitted to the output of the reversible counter 25, which changes the conversion coefficient of the links 21, 14 and 22, 15 in accordance with expression (4). Thus, we obtain the functional dependence of the form F. K, / Y. With a linear change in the coefficient of predshani K in expression (1) using the code Y, we obtain a functional dependence of the form F,

ABOUT

 . The reproduction feature of the F K sinY function is that it is obtained using a second-degree approximating polynomial using the multiplication operation on decoding matrices 22, 21 and summing scale amplifiers 15, 14 for squaring and then summing up the scale amplifier 16 .

To ensure the change in the duration of the Tf front and the cutoff T of triangular pulses and their ratio (well

n), while maintaining the constant frequency f and the pulse following period T, it is necessary to implement equality (1).

The durations of T and T have the following dependencies on 1+ and the right part -fangency (8) will be constant if the relationship between I and 1 is non-linear,

Using decoder resistor arrays 21 to 22 and summing scaling amplifiers 14 and 12, these requirements can be met.

The output currents of the inverters 7 and 8, the voltage, respectively, I OS and 1 can be represented in the following form

thirty

T

I 5

(9) (10)

Taking into account that the numerical value of the code of the pulse following period

one

f.

Y, Y., Y,

and substituting expressions (9), (10) in (8), we get

f K-Y / Yf (11) From expression (11) it follows that the frequency of the pulses does not depend on the numerical value of the codes Y ,, Y, i.e. it remains constant.

Solving the expressions (6), (9), (7) and (10) together, we get

T - Y

 X P

(12)

T,

(13)

Since the coefficients K / x are constant, the durations of the front, the cutoff T, of the pulses are linearly dependent on the numerical values of the Y and Y codes at constant frequency, i.e. form functions

1.1 P.5,

I.I

The function of the form F К / Y is realized taking into account expressions (6), (7) with

a linear change in the coefficient K in expression (2) with the help of the code Y. In this case, switching from one functional dependence to another is carried out programmatically.

Claims (1)

Invention Formula A function generator containing an electron switch connected by an output to an input of an integrator, the output of which is the output of a triangular voltage generator and connected to the input of a relay element connected by an output to an output of a rectangular voltage generator and the first, second connected electronic switch information inputs, respectively, to the direct and inverse outputs of the control unit, connected by a clock input to the output of the relay element; ii, use it with your outputs to the control the inverter is connected to its second output and to the control input of the second resistor matrix; the outputs of the first and second resistor arrays are connected to the first inputs of the first and second total scale amplifiers connected by the second inputs to the outputs of the second and third keys, the first and second information inputs of the third summing scale the amplifier is connected to the first information inputs of the first and second switches, the second information inputs of which are connected to the output of the third summing scale amplifier The cell connected by the first information input with the output of the second summing scale amplifier and the first information inputs of the third and fifth switches, the second information input of the third summing scale amplifier is connected to the output of the second summing scale amplifier and the first the inputs of the control unit containing a reversible counter, two keys and four information inputs of the fourth four switches, a switch differently connected by a second insch and with the fact that, for the purpose of an extension input with information nor functionality beyond the account of the program transition from the start of the third key and the output of the fifth switch connected by the second information input to the information input of the second key, the second information input of the third switch and the generator frequency input, the outputs of the third and fourth curves of one functional dependence to another, into the control unit generator, a third key, a T - L1 switch and a digital switch, three summations amplifier, two decoding resistor switches are connected to informatics, an inverter and two voltage converters — a current, the outputs of which are connected respectively to the direct and inverse outputs of the generator control unit, the clock input of the generator control unit through the first key is connected to the counter the input of the reversible counter connected by the outputs with the control input of the first decoding revistor matrix and the information input of the digital the madion inputs of the first and second decoding resistor arrays, respectively; the inputs of the first and second voltage converters are current 40 are connected respectively to the direct output of the first switch and the inverting lead of the second switch, controlling the inputs of three switches, five switches, a digital switch and the control input of the meter reverse are connected to the corresponding a switch whose first output is to the control inputs of the control unit. ten 20 98777 6 the inverter is connected to its second output and to the control input of the second resistor matrix; the outputs of the first and second resistor arrays are connected to the first inputs of the first and second total scale amplifiers connected by the second inputs to the outputs of the second and third keys, the first and second information inputs of the third summer scale amplifier connected to the first information inputs of the first and second switches, the second information inputs of which are connected to the output of the third summing scale wuxi Ithel connected to the first data input with the output of the second summing amplifier, and scaling the first data inputs of the third and fifth switches, the second information input of the third summing scaling amplifier connected to the output of the second summing and scaling amplifier first t5 the input of the third key and the output of the pth switch, connected by the second information input to the information input of the second key, the second information input of the third switch, and the generator frequency reference input, the outputs of the third and fourth switches the madion inputs of the first and second decoding resistor arrays, respectively; the inputs of the first and second voltage converters are current 40 are connected respectively to the direct output of the first switch and the inverting lead of the second switch, controlling the inputs of three switches, five switches, a digital switch and the control input of the meter reverse are connected to the corresponding Editor V.Danko Order 892/53 Circulation 673 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 Tabliil / Table 5 Compiled by N.Zaitsev Tehred I.Popovich Proofreader M.Sharoshi