SU379975A1 - FUNCTIONAL VOLTAGE GENERATOR OF STEPPED FORM - Google Patents

Description

one

The invention relates to the field of automation and can be used for automatic electronic tuning of resonant systems of wide-range panoramic receivers.

Known functional voltage generators of a stepped form, containing a master pulse generator, a decoder, the output of which is connected to a trigger connected to a reversible counter, and a code-voltage converter with a low nonlinear function approximation connected to the output of the counter.

The purpose of the invention is to improve the accuracy of the approximation of the nonlinear function of the generator.

For this, the function generator further comprises a burst filling pulse generator and a burst duration modulator comprising a key, a pulse counter, and a code matching circuit. The key output is connected to the inputs of said counters, the output of the pulse counter is connected to one of the inputs of the code matching circuit. The other input of the coincidence circuit is associated with the output of the decoder. One of the key inputs is connected to the output of the code matching circuit, the second input of which is connected to the pack pulse generator, and the third to the master pulse generator.

FIG. 1 shows a block diagram of a generator; in fig. 2 - stress diagrams for his work.

The function voltage generator of the stepped form contains the master pulse generator /, the pulse width modulator 2, the reversible counter 5, the Code-voltage 4 converter, the decoder 5, the control trigger 6, the pulse pulse generator 7, the pulse width modulator consists of a key 8, a counter 9, and a matching code circuit 10.

The pulse repetition rate of the generator / determines the duration of the voltage level. The pulses from the generator / go to the modulator 2 of the duration of the pulse bursts, where the pulses from the generator 7 are also fed to the pulses, the frequency of which is chosen much higher than the frequency of the generator /.

A packet of pulses from the output of the modulator 2 is fed to a counter 3, which generates a code that controls the converter 4 "voltage code. The duration of a burst of pulses is always much less than the duration of the voltage level at the output of converter 4 (due to the frequency ratio of the oscillators / and 7).

We further accept that the pulse train forms the front of the voltage step.

The voltage increment (small value) at the output of converter 4 when a bumpy pulse arrives from a pack is always constant, therefore the total value of the voltage increment when a counter arrives at the counting input of 3 packs of pulses will depend on the number of pulses in the packet.

Modulator 2 operates as follows.

Normally key 8 is closed. At the moment of arrival of the pulse from the generator 1 (Fig. 2, a), the key 8 opens, and the pulses from the generator 7 (Fig. 2.6) through the public key 8 arrive at the counters 3 and 9. The code of the counter 3 controls the operation of the converter 4, at the output of which a step voltage is formed (Fig. 2, d). The duration of the step of this voltage is equal to the period of the pulse of the generator 7. At the same time, the counter 9 counts these pulses, continuing until its code coincides with the control code supplied to the coincidence circuit of 10 codes from the decryptor 5.

At the moment of the codes coinciding, the impulse from the output of the coincidence circuit 10 closes the key 8 and finishes forming the front of the voltage level at the output of the converter 4. The magnitude of the stage is directly proportional to the number of pulses received by the counter 3.

Simultaneously with this pulse from the output of the coincidence circuit 10, the counter 9 is reset, which is then ready to generate a new burst of pulses. The frequency of the pulses of the generator 7 can be selected very high, to non-small megahertz.

Usually take the ratio between the duration of the pulse and its front

Tf 0.1 Guy.

Based on this, the maximum number of pulses in a packet is equal to 32 (which makes it possible to form 32 different paclons of voltage with a resolution of 1/32, placing from 1 to 32 pulses per burst), and the maximum possible pulse frequency of the generator is 7-8 MHz. The minimum possible step duration should be set to Tmin 0.1 mlsec.

The change of the angle of inclination in the nodes of the approximation is made by a command from the deflector 5 as follows.

The decryptor 5 modifies the code entering the matching circuit 10 in accordance with a predetermined function. This code determines the moment of coincidence of the code of the decimator 5 and the counter 9, consequently, the moment of closing the key 8, as well as the number of pulses arriving at the counter 3, i.e. the duration of the pack.

FIG. 2 shows the change in the angle of inclination at the moment.

Subject invention

A function voltage generator of a stepped form, containing a master pulse generator, a descrambler, to the output of which is connected a trigger connected to

reversible counter and, to the output of the counter, a voltage-code converter, characterized in that, in order to increase the accuracy of the non-linear function approximation, the function generator further comprises a pulse filling pulse generator and a pulse width modulator modulator, consisting of a pulse counter and a coincidence circuit, the key output is connected to the inputs of the unified meters, the output of the counter counter is connected to one of the inputs of the coincidence circuit, and the other input of the coincidence circuit is connected to output house decoder, to output a coincidence circuit connected codes one of key inputs, the other input of which is connected to the pulse generator fill packs, and the third - to specify the pulse generator.