SU1045358A1 - Step voltage generator - Google Patents

Description

The invention relates to the impulse /: technique and, in particular, to the generation of pulses of a special form. Step generators are known, which contain a generator whose output is connected to the pulse counter input, and a digital-to-analog razov-gel, at the output of KOTOjjoro with a step voltage Ulj The disadvantage of these generators is their relative complexity. Closest to the proposed technical entity is a step voltage generator, made on the converter of an impulse code to voltage and providing a step voltage at the output when the input of a binary counter of a periodic sequence of ticles is applied. The generator contains controllable keys, the output of each of which is connected to the first resistor of the corresponding resistor divider voltage and the control input is connected to the corresponding bit of the binary pulse counter, and the resistor divider is connected to the keys in such a way that when the pulses arrive at the input of the output counter divider popuchaeka; stepwise varying voltage C2J The disadvantage of the known generator is that the resistances of the voltage divider resistors correspond to the weighting factors of the meter and must be chosen with high accuracy. Precision resistors are commonly used, and the weights of the binary pulse counter are not related to the school of resistor resistance ratings used by the industry. Therefore, when creating such devices, ensuring the necessary accuracy in selecting the values of the resistances of the divider resistors | and their compliance with them are contradictory requirements. In addition, due to the large difference in the resistance values of the resistors, the disadvantage of this generator is the large difference in their temperature HEFDC coefficients, which leads to a violation of the equality of the steps of the output 1 voltage during external conditions of VIY, i.e. output voltage instability. The circuit of the invention is an increase in the manufacturability of the generator at one belt, the continuous stability of the output) for example, The fasting target is achieved by having a 1X5 pin (e step voltage containing a pulse counter, an input that is connected to the input source 1-x source) of the signal, controllable keys, the output of each of which is connected to the first resistor of the corresponding output voltage divider , the Johnson counter was used as a pulse counter, with the second resistor of Each resistor voltage divider connected to the direct output of the corresponding Johnson counter, the inverse output of which is connected to the control named by the input of the corresponding controlled key, Fig. 1; e presents the principal circuit diagram of the generator of a cohesive voltage; The generator contains a Johnson ring counter 1, voltage dividers consisting of 2-1-2-W and 3-1-3-N1 resistors and controlled keys 4-1 4-H. Moreover, the direct outputs of the bits of the Johnson counter 1 through dividers, for example, of the junction with resistors 2 K / and 3 -. K | They are connected to the outputs of the corresponding keys 4-1-4-N, to the control inputs of which the inverse outputs of the bits of the counter 1 are connected. The generator works as follows. When the 1-trigger cell of the counter 1 is in the state O (the inverse output is valid 1), the corresponding switch (4- i) connects the lower (according to the circuit) pin of the resistor (3 -f) connected to the input of this switch (4 - -i) with the ground. Therefore, assuming that Кз 4 7 8 R,, it is possible to write down Е L Q - IP, А .1, where K-ЯЮ- values of resistors 2-1-2-N and 3-1-3-. M, since P 4-Q - N1 It is obvious that the magnitude of the output voltage steps is the same (AIJ-EjM) and does not depend on the resistance values of the voltage divider resistors. Р is the probability of coincidence of the signs of functions compared at the divider of the elec- tron of the eigenfunctions obtained due to the fact that one voltage divider U is connected to the inverse of the direct Outputs of the trigger cells of counter 1; therefore, on the bridge circuit, there is a comparable JhM

This will be done at several points, the number of which is equal to the number of three counter cells of the counter, and in the diagonal of the bridge is obtained nairn, proportional to the sign correlation of the wave () of these waves).

Ne Correlation Theory and Valuation}

that m-Rgde P is the probability of a match

compared functions

O is the probability of mismatching the signs of functions.

In our case, P - | Γ V where Q is the number of three-P eer cells of the counter, which is found to be 0.55

; M-numberpaqp counter count.

Since the step voltage generators are the most widely used in characterographs, digital measuring devices, generators, times-20 times of character traps, converters of the number-pulse code into voltage, etc., MoiTyt will need stepwise Voltages of various shapes. The proposed generator circuit is based on the count-5-Johnson generator voltage step. To get asymmetrical

.

Nominal Pressure; counts D) 4son Iiyzhno to be replaced with a pop-ring counter. By semirings 5 m the account S1KOM is understood to be such a scoring device, in which certain code combinations are obtained by the action of input pulses

The code combo shafts in the ptf1 of a single semiring counter are presented in the table.

In this case, if the inputs of the deligel voltage are connected to the forward outputs of the trng cells of the semiring counter j, then a stepwise increasing voltage is obtained, and if it is connected to a 1-hole voltage, then a decreasing step voltage is obtained. The principle of operation of the circuits in this case remains the same as indicated.

The advantage of the proposed step voltage generator is the equality of the resistance values of the voltage divider resistors. This feature allows, for example, to build a number-pulse-to-voltage converter into a high-precision voltage, to improve the stability of the TSv operation, as well as to increase technological effectiveness.

Claims (1)

STEPS VOLTAGE GENERATOR, containing a pulse counter, the input of which is connected to the input signal bus, controlled keys, the output of each of which is connected to the first resistor of the corresponding voltage divider, characterized in that, in order to improve manufacturability while increasing the stability of the output voltage, the Johnson counter is used as a pulse counter, and the second resistor of each resistor voltage divider is connected to the direct output of the corresponding discharge yes Johnson counter, whose inverse output is \ connected to the control input, respectively! the current managed key.