SU877581A1 - Step voltage function generator - Google Patents

Description

one

The invention relates to automation and computing, in particular to digital-analogue generators of functionally varying voltages. .

A functional generator is known, comprising a pulse generator, a linear code-voltage converter, a counter, a phase shifter, a decoder, a step voltage & voltage generator, and an adder l.

The disadvantage of the generator is the reduced accuracy of the generation

functions ..:

A function generator is also known, comprising a pulse generator, a counter, an AND group of elements, an OR element, a switch, a reversible counter, a control unit, and a code-voltage converter 2.

The disadvantage of this generator is limited: the upper range of generated functions;

Closest to the proposed is a functional voltage generator, containing a pulse generator, the first counter, the outputs of which bits are connected to the inputs of the first decoder connected to the output with a counting input

the second counter connected to the outputs of the bits to the inputs of the second decoder, the outputs of which are connected to the control inputs of the switch connected to the counter input of the reversible counter connected to the outputs of the bits to the inputs of the linear code-voltage converter, the output of which is the output of the functional generator, and the signal inputs of the switch are connected to the outputs of the matrix of coefficients connected by inputs to the outputs of a group of elements And connected by inputs

15 to the outputs of the bits of the first counter connected by a counting input with the output of the pulse generator g.

The disadvantage of this device is the reduced accuracy of generation

20 functions.

The purpose of the invention is to improve the accuracy of generating functions.

The goal is achieved by the fact that in a functional generator of foam voltage, containing a pulse generator, the first counter, the outputs of which bits are connected to the inputs of the first decoder, connected by an output with a counting input

30 second counter connected to the outputs of the bits to the inputs of the second decoder, the outputs of which are connected to the control inputs of the switch connected to the output to the counting input of the reversible counter connected to the outputs of the bits of the inputs of the linear converter voltage-voltage generator whose output is the output of the function generator , a variable-division frequency divider, a phase shifter, and a Walsh function shaping unit connected by outputs to the signal inputs of the switch were added, and passages - to the output bits of the first counter, the counting input of which alternation serially connected phase shifter and a frequency divider with a variable division ratio connected to the output of the pulse generator.

The drawing shows a block diagram of a functional step voltage generator.

The circuit includes a pulse generator 1, the output of which is connected through a serially connected divider 2 frequencies with a variable division factor and a phase shifter 3 connected to the counting input of the first counter 4. The discharge outputs of the counter 4 are connected to the inputs of the first decoder 5 and Walsh functions. The output of the decoder 5 is connected to the counting input of the second counter 7 connected by the bit outputs to the inputs of the second decoder 8. The outputs of the decoder 8 are connected to the control inputs of the switch 9 connected by signal inputs to the outputs of block 6, and the output to the counting input of the reversible counter 10. The outputs of the bits of the counter 10 are connected to the inputs of the linear code-voltage converter 11, the voltage of which is the output of the function generator.

The function generator works in the following way.

The pulse sequence from the output of the generator 1 is fed to the serially connected divider 2 and phase shifter 3, which is used to adjust the follow-up period and the phase of the pulses fed to the counting input of counter 4. Block 6 forming Walsh functions implemented, for example, on modulators two, for each time interval Tj, between successive overflows of counter 4, forms Walsh functions with the number of pulses 1, 2, 3, ..., (where n is the counter size of 4) and analogs of these functions, out of phase by 90.

The pulsed signals generated by block 6 are fed to the corresponding signal sources of switch 9, which is a combination of a group of two-input elements

And, the outputs of which are connected to the inputs of the output element OR. The first and second inputs of the And elements are respectively the signal and control inputs of the switch 9.. The decoder 5 decodes the zero states of the counter 4, which correspond to the boundaries between each two adjacent approximation segments of the function reproduced by the generator.

Under the influence of output pulses

decoder 5, the counter 7 changes its state, with the result that each time one of the outputs of the decoder 8 produces an output signal that allows one of the pulse sequences from the outputs of unit 6 to pass to the output of switch 9. The pulses from the output of the com 9 are sent to the input of the reversible counter 10, the state of the discharges of which is converted into the output step-variable functional voltage by the code-voltage converter 11.

Thus, the proposed functional generator compared to

known improves accuracy

generating specified functions (in particular, periodic) by ensuring that the period and initial phase of the output voltage are exactly matched using divider 2 and phase shifter 3, as well as by reducing the quantization step in amplitude by a factor of two in each of the approximation subintervals (with the same the capacity of the counters 4 in the proposed

5 generator and known). The latter is explained by the fact that, in contrast to the known device in the proposed generator, the decoder 5 decodes the boundaries of the approximation segments according to

0 zero states of the counter 4, which makes it possible to form Walsh functions according to the complete set of states of this counter.

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Claims (3)

1. Author's certificate of the USSR 304599, cl. G 06 J 3/00, 1970. 2. Authors certificate of the USSR 452059, cl. H 03 B 19/00, 1973. 3. US patent number 3529138, .cl. 235-150.53, published. 1970 (prototype;