SU736129A1 - Function generator - Google Patents

Description

(54) FUNCTIONALNBSH GENERATOR

one

The invention relates to automation and computing and can be used, in particular, in master and simulation devices.

A function generator is known comprising digital-to-analog converters, a memory unit, a counter, a control unit, adders, comparators, an integrator, and a controlled inverter 1.

A function generator is also known, comprising a pulse generator, a controlled frequency divider, a reversing register, a threshold circuit, triggers, counters, AND and OR elements, and a low-pass filter 2. Both of these devices have a complex structure.

Closest to the invention is a function generator comprising a first digital-to-analog converter connected by an output to an input of a controlled current-stabilizing two-terminal circuit, the output of which is connected to the signal input of the discharge key, the first input of the comparator, the output of the function generator and through the storage capacitor to the zero bus of the function generator, connected to the output of the bit key, and the second input of the comparator is connected to the output of the second digital-to-analog converter, Inonii digital inputs and outputs of block m pa ti ordinate, the digital inputs of the first digital to analog converter connected to the outputs of down counter connected to an input summing the first output and the first input of the second

10 elements And, and the input of the subtraction - with the output of the third element And and the first input of the trigger connected by the outputs to the first inputs of the first and third elements And and connected by the second input to the output of the comparator and the second input of the second element And, the output of which is connected to the switching input key 3. In this generator, the ordinate memory function performs a memory register.

2Q This functional generator is characterized by a limited class of reproducible functions, since it generates a sawtooth voltage controlled in amplitude and slope of the sections with a positive slope and does not allow to obtain a periodic voltage of a complex shape with adjustable parameters of sections with positive and negative slopes.

The aim of the invention is to expand the class of reproducible functions.

For this, a functional generator containing a first digital-to-analog converter connected by an output to an input of a controlled current-stabilizing two-pole device whose output is connected to a signal input of a discharge key, a first input of a comparator, an output of a function generator, and through a storage capacitor to a zero bus of a function generator connected to the output the bit key, and the second input of the comparator is connected to the output of the second digital-to-analog converter connected by digital inputs with the outputs of the ordinate memory block, the slope angles and the ring register connected by input with the comparator output are added, and the outputs are with the address inputs of both memory blocks, with the slope memory block connected by code outputs to the digital inputs of the first digital-analog converter , and the output of the tilt sign to the switching input of the bit switch connected by the input of the control of the discharge current to the output of the first digital-to-analog converter.

The drawing shows a block diagram of the device.

The functional generator contains a ring register 1 connected by outputs to the address inputs of blocks 2 and 3 of the ordinate memory and tilt angles. The code outputs of the memory block 3 and the tilt angles are connected to the digital inputs of the first digital-to-analog converter 4, and the output of the block 3 is connected to the switching input of the bit switch 5. The output of the converter 4 is connected to the current control input of the bis switch key by the input of a controlled current-stabilizing two-terminal 6 the output of which is connected to the signal input of the bit switch 5, the first input of the comparator 7, the output of the function generator and through the storage capacitor 8 to the zero bus of the function generator. The output of the bit switch 5 is also connected to the zero bus. The second input of the comparator 7, connected by an output to the input of the ring register 1, is connected to the output of the second digital-to-analog converter 9. The digital inputs of the converter 9 are connected to the outputs of the ordinate memory block 2. Memory blocks 2 and 3 can be implemented, in particular, in the form of programmable memory devices.

Functional generator operates as follows.

When power is turned on at the outputs of the ring register 1, logical "I. When a function generator (not shown in the block diagram) is fed to the start bar, a logical "O" appears on the first output of register 1, which excites the corresponding address inputs of memory blocks 2 and 3. From the output of memory block 2 to the inputs of digital-analogue the converter 9 receives the code of the final ordinate of the first section of the approximation of the generated function, which is converted into the voltage applied to the second input of the comparator 7. The first input of the comparator 7 receives a varying voltage, slope which) in the first section of the approximation is given by the output code of the memory block 3, converted to voltage by a digital-to-analog converter 8 and generated by a two-terminal current stabilizing 6. This variable voltage accumulates in the capacitor 8. When the voltages are equal at the inputs of the comparator 7, the output forms an impulse arriving at the input of the ring register 1. A logical "O is formed at the next output of the ring register 1 and excites the following address inputs of memory blocks 2 and 3. At the inputs Formers 9 and 4, the codes of the final ordinate and the angle of inclination of the function of the next approximation segment are received. These codes are converted into voltages, one of which is fed to the second input of the comparator 7, and the other to the input of a controlled current-stabilizing two-pole 6. The current flowing through the two-pole b changes, resulting in a change in the charge rate of the capacitor 8, and hence the output voltage slope.

At the time of comparing the voltage on the capacitor 8 and the voltage at the output of the converter 9, the second approximation section ends and the comparator 7 is triggered. Then the process proceeds as described.

When forming sections with a negative angle of inclination, a signal appears at the output of the slope sign of the memory block 3, which arrives at the switching input of the discharge switch 5 and connects it via the signal input to the storage capacitor 8. In this case, the storage capacitor 8 begins to discharge key 5 with a constant time determined by the voltage level from the output of the converter 4 at the control input of the discharge current of the switch 5. The process continues until the comparison of the voltages at the capacitor 8 and at the output of the converter 9.

The discharge switch 5 can be made according to a scheme with current-stabilizing triodes controlled by various levels of the base voltages.

Claims (1)

Claim A functional generator comprising a first digital-to-analog converter connected by an output to the input of a controlled current-stabilizing two-terminal device, the output of which is connected to the signal input of the bit key, the first input of the comparator, the output of the functional generator and through the storage capacitor to the zero bus of the functional generator connected to the output of the bit key, and the second the comparator input is connected to the output of the second digital-to-analog converter connected by digital inputs to the outputs of block p five ordinates, characterized in that, in order to expand the class of reproducible functions, an angle slope memory unit and a ring register connected to the input with the comparator output are additionally introduced into it, and 5 outputs are used with address inputs of both memory blocks, and the angle tilt memory unit is connected code outputs to the digital inputs of the first digital-to-analog converter, and the output of the sign of the slope to the switching input of the bit key ¹⁰ connected by the discharge current control input to the output of the first digital-to-analog converter Vatel.