SU788369A1 - Pulse-width converter - Google Patents

Description

(54) PULSE TRANS110-PULSE CONVERTER

one

The invention relates to a pulse technique and can be used in computing and electrical measuring devices.

The closest to the proposed 5 in technical essence is the pulse-width converter, the input signal source, the comparator, the discharge key element, the trigger, the storage capacitor, the current source and the control unit, which uses the ij clock generator. .

The disadvantage of this converter is the low precision of the pret 5 formation. In addition, the functionality of this converter is limited due to the impossibility of its operation with a bipolar input signal.

The purpose of the invention is to improve the accuracy of conversion and expansion of functionality.

The goal is achieved by the fact that a known converter containing a source of input signal, a comparator, one of the inputs of which is connected to the output of a current source, which is connected to a common bus through a storage capacitor, is shunted

the first bit key element controlled by the trigger output, one of the inputs of which is connected to the output of the comparator, the other - with the output of the control unit, the element is set to decrease the voltage, the first and second charging key elements, the storage capacitor, the second bit key An element, the input signal source through a serially connected voltage bias element and the first charging key element controlled from the output of the control unit, is connected to one of the inputs of the comparator, the second input of which It is connected to one of the outputs of the voltage displacement element through the second charging key element controlled from the output of the control unit, and between the common bus of the pulse-width converter and the first input of the comparator, a capacitor bridged by the second bit controlled from the output is connected. trigger

Claims (1)

.In FIG. 1 shows a block diagram of a width-to-pulse converter; 2 shows timing diagrams for his work. The converter contains an input signal source (not shown in the drawing), voltage bias element 1 charging key elements 2 and 3, co-generator 4, current source 5, storage capacitor 6, storage capacitor 7, bit key elements 8 and 9, trigger 10 and control block 11. The Converter operates as follows. From the output of the input source to the input of the displacement element 1, the bi-pole signals of the first and second samples of the first, second samples are received from the following list: jt-DWl-i p. ISiWiJWki btuUUJvJVjn UQ..5CJJ /. RA, blowing one after another (Fig. 26). The bias element 1 shifts the samples by the value of B (Fig. 2b on its first output and on the value of E2 (Fig. 2d) - on the second. Simultaneously with the beginning of the samples, control unit 11 and trigger 10 are triggered at time tg. Tension E + from the first output of the bias element 1 is supplied to the input of the charging key element 2, and the voltage E (4U0) (CO of the second output of the bias element 1 to the input of the charging key element 3, At time t according to sig from the corresponding output of the control block 11 via the key edge element 2. A voltage is built, the value of which is stored on the storage capacitor 7 (Fig. 2b). At a time t, a voltage gating + Ug (Fig. 2d) is generated by the control unit via a charging key element 3 (Fig. 2d), the value of which is the initial level in the formation of a sawtooth voltage on the storage capacitor 6, to which the current source is connected. Thus, a signal is sent to the first input to the 4, or in the presence of an additive interference signal at the input of the voltage bias element 1 p., (1 a to the second input of the comparator 4 postures a voltage Uu E., ± id; (,, and if there is interference, Uu E iUg UgxH Polarity and amplitude of the p mex signal when gating key charging elements 2 and 3 at times tj and t can be considered unchanged, if the sampling pulses are sufficiently short with respect to the slowly changing signal of interference (drift zero, pickup, etc.) At t 2 (figure 2), the voltage Up UM-i becomes equal to zero VJ those. l.-Uex, (,, lU ,,.) 0, from where: b-lE -E tZUex.V At the moment of equality of the voltages Uc and Un, the comparator 4 generates a pulse, re-flip trigger 10. At the same time, the key elements 8 and 9, removing charges from storage capacitor 6 and storage capacitor 7, respectively. The operation of the converter with a unipolar signal can be represented as a special case when there is no second sample. Thus, the width-to-pulse converter works with both a unipolar and a bipolar input signal, and when the converter operates with a bipolar-sampled signal, the error signal that occurs at its output when an interference signal is applied is practically eliminated. The invention of the Pulse Width Converter, containing one input source, a comparator, one of the inputs of which is connected to the output of a current source, which is connected to a common bus through a storage capacitor, shunted by the first bit key element controlled from the trigger output, is one of the inputs which is connected to the output of the comparator, the other - to the output of the control unit, characterized in that, in order to increase the accuracy of the conversion and enhance the functionality, the element cm voltage, the first and second charging key elements, the storage capacitor, the second bit key element, the input source through a series-connected voltage bias element and the first charging key element controlled from the output of the control unit, connected to one of the inputs of the comparator, the second input of which is connected to one of the outputs of the voltage displacement element through the second charging key element controlled from the output of the control unit, and between the common bus pulse width the generator and the first input of the comparator switched on the storage capacitor shunted by the second bit key element controlled from the trigger output. Sources of information taken into account in the examination 1. S. Kulikov. and Chistov B.V. Discrete transducer signals. M., Energie, 1972