SU1396151A1 - Function generator - Google Patents

Abstract

The invention relates to a pulse technique and can be used to synthesize signals of complex shape, process modeling, in measuring and computing systems that require the conversion of digital signals to analog ones. The purpose of the invention — extending the functionality — is achieved by programmable control of the smoothing pulse duration and the input signal level in a real time scale, Dp achieving this goal, the pulse generator is controlled, and the digital-to-analog converter 13, the operational amplifier 16, the second 7, and the third 15 memory blocks, the shaper 12 read and write pulses. In addition, the function generator comprises a pulse generator 1, a first memory block 2, elements of 3, 4, 6 and 14 memory, a shaper of 5 write pulses, a shaper of 8 and 9 pulses, an inverter 10, an adder 11, an output 17 of a device, an input 18 Shaper 12 installations, control inputs 19 and 20. The operation of the function generator is explained in the time diagrams provided in the specification. 1 hp f-ly, 2 ill. cl

Description

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 The invention relates to a pulse technique and can be used by the IHO to synthesize a signal of complex shape, to simulate processes in measuring and computing complexes that convert digital signals to analog.

The aim of the invention is to spread out the functionality by providing programmable control of the pulse width I of smoothing and the output level in real time. I FIG. 1 shows a functional generator; in fig. 2 - time I diagrams that show his work. : The functional generator contains 1 pulse generator, the first memory block 2, the first 3 and the second 4 memory elements, whose inputs are connected to the output of the first memory block 2, the shaper of the five recording pulses, the first and second whose exits; connected to the controller with inputs 3 and the second 4 memory elements, respectively, the third memory element 6, the output of which is connected to the control input of the pulse generator 1, the second memory block 7, the output of which is connected to the input of the third memory 6, the first driver of 8 pulses, the signal input of which is connected to the first output of the generator of 1 pulses, and the control input connected to the output of the first element D

3 math, the second formaker is 9 I1ch pulses, the control input of which is

 written with the release of the second element

4pami tee, inverter 10, the input of which is connected to the first output of the generator

1 pulses, and the output to the signal input of the second pulse generator 9, the adder 11, the first and second inputs of which are connected to the first 8 and second 9 drivers, respectively, the reading and writing pulse driver 12, the synchronization input of which is connected to the input of the driver 5, input the first memory block 2 and the second output of the pulse generator 1, and the first code is connected to the control inputs of the third element 6 and the second memory block 7, a digital-analog converter 13, the reference voltage input of which is connected to the output of the sum Ator 11, a fourth memory element 14, the output of which is connected to the information input digital

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analog converter 13, the third memory block 15, the control input of which is connected to the control input of the fourth memory element 14 and the second output of the driver 12, a single amplifier 16, the input of which is connected to the output of the digital-analog converter 13, and the output is output 17, the installation input 18 is the installation input of the imaging unit 12, the first input 19 and the second control input 20 are the shutdown inputs of the second unit 7 and the third memory unit 15, respectively.

FIG. 2 shows time diagrams; a - smoothing pulses at the first output of the generator 1J 5 - smoothing pulses at the output of the inverter 10; L - the driving pulses at the second output of the generator 1; -2 - recording pulses at the first output of the imaging unit 5; 9 - recording pulses at the second output of the imaging equipment 5; e - pulses on the second call {ode shaper 12 - pulses at the output of the first shaper 8; h - pulses at the output of the second driver 9; and the signal at the output of the operational amplifier 16.

The function generator works in the following way.

The pulse generator 1 at the first output expresses a sequence of pulses of the desired shape, for example, triangular (Fig. 26), and the following frequencies, which serve as initial smoothing pulses, and at the second output, a sequence of rectangular pulses (Fig. 2B), which are in terms of frequency by smoothing pulses and a preset time for generating pulses for reading information from memory blocks and writing to memory elements.

The pulses of the generator 1 are rigidly time-bound in their first and second outputs and have the same frequency followed (Fig. 2, q, b),

The pulses of the generator 1 are fed to the signal inputs of the first driver 8 pulses (Fig. 2, a), and the second driver 9 pulses arrive through the inverter 10 (Fig, 2, S). In each of the formers of 8 and 9 pulses, the input pulses are normalized by

the specific adjustment of their transmission coefficients so that the amplitudes of the pulses are equal to the instantaneous values of the output signal at the corresponding points in time (Fig. 2, F, U)

The amplitude value in each of the drivers is set through their control inputs using the first and second elements 3 and 4 of the memory at the beginning of each period. Codes recorded in elements 3 and 4 are maintained for the entire period of pulse formation. New code values are written into them from memory block 2, which contains instantaneous output values in code form. Recording order from memory block 2 to memory elements 3 and 4 is performed by the shaper of 5 write pulses. At the beginning and end times of the next driver a pulse from the second output of the generator T reads the next code from the memory block, however, the code will be written into one or another element 3 and 4 of the memory. In which of them the shaper 5 write pulses determines the code. In one of the memory elements, a code read at even addresses is recorded on the leading edge of the driving pulses, and a code at the odd addresses of the memory block 2 (FIG. 2,8,2,3) is written on the falling edge of the driving pulses The first output of the generator 1 is determined by the code at its control input, the installation of which is carried out with the help of the third memory element 6 at the beginning of each period (Fig. 2.8). The code value recorded in the third memory element 6 is stored throughout the entire pulse generation period. New code values are written into it from the second memory block 7, containing in code form the pulse duration values at the first output of the generator 1. The order of reading the codes from the second memory block 7 and writing them to the third memory element 6 is controlled by pulses with the first output of the imaging unit 12 read and write pulses, to the input of which pulses are received from the second output of the controlled pulse generator 1.

Normalized impulses in amplitude and duration from the formi-51 outputs

The sensors 8 and 9 are fed to the inputs of the adder 11, at the output of which an analog signal appears, the form of which is recorded in coded form in the first memory block 2 (Fig 2, and),

The output signal from the adder 11 is fed to the input voltage of a digital-to-analog converter (D / A converter) 13, which works in conjunction with an operational amplifier (OA) 16. In the D / A converter 13, the output analog signal is normalized by discrete transmission gain control. The output signal level is set through the data inputs of the D / A converter 13 using the fourth memory element 14 at the beginning of each output signal period. The value of the code recorded in the element 14 is stored for the entire period of the formation of the output signal. The new code values are written to the memory element 14 from the third memory block 15, which contains in code form the values of the output signal level for a certain time of generating the output signal. Managing the order of counting codes from the third memory block 15 and writing them to the third memory element 14 is carried out by pulses from the second output of the read 12 and write write generator 12 (FIG. 2, e). Frequency division occurs in the read and write shaper 12 pulses from the second output of the generator 1 pulses.

The division coefficients for the first and second outputs of the imaging unit 12 may be different and are set before generating a signal from the external input 18 of the setup. The division ratio of the first output is determined by the ratio of the frequency of changing the duration of the smoothing pulses to the frequency of the driving pulses from the second output of the generator 1,

The division factor for the second output of the generator 12 is determined by the ratio of the period of the high signal with the period of pulses from the second output of the generator 1 of pulses. In the driver of the 12 read and write pulses, a pulse is formed (FIG. 2, e) that goes to the input of the third block 15 memories and control

fourth of memory element 14. When: this, the next code value is read from the third memory block 15 and written to the fourth memory element 14. The output signal, normalized by the level at each period, through the op-amp 16 is fed to the output 17 of the function generator.

When generating signals of long duration and / or use

smoothing pulses of constant duration after the control code values are written to the third and fourth: memory elements 6 and 14 with a signal

: on the first and second inputs 19 and 20 of the control, the second and the third blocks 7 and 15 of the memory can be turned off. Thus, the power consumption of the functional generator decreases. ; When generating signals of short duration and / or variable duration of smoothing pulses, the third

: and fourth, elements 6 and 14 of memory: may be absent in the functional generator. In this case, the control codes from the second memory block 7 are directly fed to the control input, the lazer of the pulse generator 1, and from the third memory block 15 to the information input of the DAC 13,

Claims (2)

1. A function generator comprising a pulse generator, a first memory block, first and second memory elements, whose data inputs are connected to the output of the first memory block, a write pulse driver, the first and second outputs of which are connected to control inputs of the first and second memory elements, respectively, the first and second pulse formers, the control inputs of which are matched respectively to the outputs of the first and second memory elements, inzerr: op, whose input is connected to the signal input of the first form the pulse generator and the first output of the pulse generator, the second output of which is connected to the input of the first memory block and the input of the recording pulse former, the adder ,, 0 five 0 50 five 0 5 Q e The first and second inputs of which are connected to the outputs of the first and second pulse shapers, the signal input of the second pulse shaper connected to the output of the inverter, characterized in that, in order to extend the functionality by providing programmable control of the smoothing pulse duration and the level of the output signal, the pulse generator is complete controllable and the device has also entered a TFAN converter, the input of the reference voltage of which is connected to the output of the adder, The on-amp amplifier, whose input is connected to the output of the digital-analog converter, and the output is the output of the device, the second memory block 5 whose output is connected to the control input of the pulse generator, the third memory block whose output is connected to the information input of the digital-analog converter, the read pulse driver records, the synchronization input of which is connected to the second output of the pulse generator, the first and second outputs, respectively, with the control inputs of the second and third memory blocks j and the input is the device installation input 2. The generator according to claim 1, of which is — so that, in order to reduce power consumption by turning on the second and third memory blocks when generating long duration signals, a third memory element is inserted into it, connected between the control input of the pulse generator and the output of the second memory block, and the fourth memory element connected between the output of the third memory block and the information input of the D / A converter, and the inputs of the third and fourth memory cells are connected to the first and second outputs The read and write pulse makers, respectively, and the off inputs of the second and third memory blocks are respectively the first and second: device control inputs. i at cpus.Z