SU1023648A1 - Stochastic voltage converter - Google Patents

Description

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00 The invention relates to the field of information signal conversion and can be used to create instruments and devices / intended for measuring electrical signal parameters. , A known stochastic voltage converter, containing a random-reference voltage generator with a uniform distribution, a voltage comparator, AND, and a clock generator Lll. The disadvantage of this device is the low conversion accuracy when operating in a wide dynamic range. The closest to the invention is a stochastic voltage converter containing a series-connected pseudo-random number generator and a digital controlled voltage divider, the output of which is connected to the first input of a voltage pararator , constant voltage source, clock pulse generator, output. which .. is connected to the first input of the element I, the second input of which is connected to the output of the voltage comparator, the second input of the voltage comparator is connected to the bus of the voltage being converted 2. A disadvantage of this device when operating in a wide dynamic range of input signals is a sufficiently high conversion error due to the effect of the drift of the voltage comparator. The purpose of the invention is to improve the accuracy of device conversion. This goal is achieved by the fact that in a stochastic voltage converter containing successively included, a pseudo-random number generator and a digital controlled voltage divider, the output of which is connected to the first input of the comparator, is a constant reference voltage source. current, the clock pulse generator, the output of which is connected to the first input of the element I, the second input of which is connected to the output of the voltage comparator, the bus through the voltage amplifier connected to the analog voltage The digital input of the digital controlled voltage divider, and the second input of the voltage supply is connected to the output of the reference voltage source. ,,. The drawing shows a block diagram of a stochastic voltage converter. A bus 1 of the voltage to be converted is connected via an amplifier 2 to a analog input of a digital controlled voltage divider 3, the control input of which is connected to the output of a divider 4 pseudo-random number. The digital control output of the voltage divider .3 is connected to the first input of the voltage comparator 5, the second input of which is connected to the d source voltage reference voltage. The generator 7 clock pulses is connected to the first input element And 8, the second input of which is connected to the output of the comparator 5 voltage .. The converter operates as follows,} -. : Convertible voltage Ux ° bus 1 is fed to the input of amplifier 2 voltage. The amplified voltage Kv, Ox / where K, is the gain of the amplifier 2, is supplied to the analog input of the digital controlled voltage divider 3 (the KV value is chosen from the condition where D is the dynamic range of the input voltages of the converter). The division factor KP. digital controlled divider 3, a voltage consisting of digital controlled resistances, varies randomly with a uniform distribution ranging from 1 to a VU generator code 4 pseudo-random numbers, and Vn is equal to Kji, as a result of the first input of the voltage comparator 5 is applied to a random voltage, obtained by converting the input signal U x to the second input of the comparator 5 voltage of the research institute receives a constant voltage UQ from the source of the reference voltage of the direct current, and UD is chosen to be equal to the maximum value of the input voltage (Jx ". The voltage comparator produces a logic-level 1 at the output. In this case, the values are in the range from 1 to о С, where in (-,. - ОО). this level is equal to Р - МЦЫХОтэ .1 1 PlKtj.) is the density of the case, the true value of K5, Then fiS NS W-S: 7 (& t) As in this expression, the values of V), K) and Uo. are constant, then the probability of occurrence of a logic level 1 at the output of the voltage comparator 5 is unambiguously determined 31023648 .4

is made the value of the input voltage, and the same level of comparable ones. With the help of the element of AND 8 and the field, determined by her unchangeable character generator of 7 clock pulses by the implementation of DO

There is a synchronization of the output transducer in a wide dynamic sequence of N. pulses. The range of input voltages is equal to the operation of the comparator 5 of the voltage transform, as compared to the transit time, always on one type.

Increase accuracy overall.

Claims (1)

(54 :) which is connected to the house of the comparator: voltages, with the fact that, in order to increase the accuracy of conversion, the bus of the converted voltage through the voltage amplifier is connected to the analog input of the digital a voltage controlled voltage divider, and the second input of the comparator is connected to the output of the voltage reference source