SU809545A1 - Function generator - Google Patents

Description

(54) FUNCTIONAL GENERATOR

one

The invention relates to a pulse and measurement technique and can be used to synthesize oscillations of complex shape, modeling processes in devices that require the conversion of digital signals into analog ones.

Electric oscillation-generating devices are known, which contain non-synchronous self-excited oscillators, shapers simultaneously generating a number of oscillations, and an adder 11.

The disadvantages of these devices are the limited possibility of generating oscillations by the number of c (; (which makes it difficult for the equipment to operate when changing the waveform), and the low functionality of reproducing signals.

The closest to the present invention is a functional generator, which forms separate parts of the oscillations, some of which are almost triangular and others are rectangular, with their subsequent summation 2.

The device contains parallel-connected rectangular and triangular pulse shapers.

the required amplitude and duration, the inputs of which are connected through the control unit to the output of the time pulse generator, which forms rectangular time pulses, the second input of the triangular pulse generator of the required type, through the triangular pulse selector, is connected to another output of the triangular pulse generator. In this device, the selector selects the triangular voltage pulses that are applied to the driver of the triangular pulses of the desired type. The resulting pulse sequences of triangular and rectangular shape from the outputs of the formers are fed to the inputs of the adder. The parameters of the pulses of triangular and rectangular shape at the output of the adder are oscillated with a given shape, frequency and amplitude.

However, this device, allowing the signal to be represented as a piece-line approximation, generally provides relatively large: amplitude-temporal distortion.

The purpose of the invention is to improve the accuracy of reproducing the instantaneous values of the generated oscillation.

The goal is achieved by the fact that a memory element whose signal input is connected to the adder output is inserted into a functional generator containing a controlled sequence generator of a smoothing pulse train whose input is connected to the generator output of the initial pulse sequence and output to one of the accumulator inputs. the control input to the output of the generator of the initial sequence of pulses, and the output to the second input of the adder.

Fig. 1 shows a structural electrical circuit of the proposed functional generator; figure 2 - the sequence of pulses produced by the generator; in fig. 3 - pulse sequence at the driver output; in fig. 4 the voltage of piecewise-step forms at the output of the memory element 4; in fig. 5 - electric oscillation generated at the output of the adder 3.

The device contains a source pulse generator 1, a controlled smoothing pulse shaper 2, the input of which is connected to the output of the generator 1 of the initial pulse sequence and the output to one of the inputs of the adder 3. The output of the memory element 4 is stored at the output of the adder 3, which stores the value of the output of the adder 3 at the time of the end of the smoothing impulses. The control input of the memory element 4 is connected to the output of the generator 1 of the original pulse sequence, and the output to the second input of the adder 3.

The device works as follows.

The generator 1 generates the initial sequence of pulses of the desired shape and frequency (Fig. 2), which is fed to the input of the forcing unit 2 of the smoothing pulses.

Shaper 2 scales and polarizes the pulses according to the code applied to the control input. The generated pulses (FIG. Arrive at one of the inputs of the adder 3. The output of the adder 3 through the memory element 4 is connected to the second input of the adder 3.

The maximum value of the first smoothing pulse is memorized and fed to the second input of the adder 3. The stored value is summed with. following impulse.

Thus, by the time of the end of each pulse, the voltage at the output of the adder is memorized, which is then fed to the second input of the adder and summed with the subsequent pulse.

The frequency, amplitude and shape of the oscillation being generated is determined by the code applied to the control input of the smoothing pulse generator. The accuracy of the formation is determined by the pulse frequency of the original sequence and their shape.

The use in the proposed generator of the memory element allows improving the accuracy of reproducing the instantaneous values of the oscillations being formed and simplifying the design.

Management is simplified, since no program is required to form a piecewise-step stress. The shaping of the smoothing pulses is carried out according to the values of the ordinates.

The reliability increases and the cost of the generator decreases by reducing the number of functional units.

It is possible to quickly change and select the optimal parameters of the approximation of the oscillation generated by changing the pulse shape of the original sequence

The generator does not require the use of frequency-selective circuits, and therefore is characterized by a lack of input for low and infra-low frequencies.

Claims (2)

1. USSR author's certificate number 296216, cl. H 03 K 5/02, 1971. 2. The patent of the Federal Republic of Germany No. 1226169, 21 a 4 8 / 01,1966. , xixtxb -l lx1Xl,