SU1250961A1 - Stroboscopic transducer of electric signals - Google Patents

Abstract

The invention relates to electrical measuring equipment and can be used to transform the time scale of repetitive electrical signals in automated measuring systems. The purpose of the invention — widening the dynamic range — is achieved by introducing 3 pulses and a key element 5 into the generator device. The drawing also shows the voltage differential generator 1, the gate pulse generator 2, the mixer 4, the storage capacitor 6, the expander 7, the control unit 8 . The device eliminates the characteristic distortion during conversion. The dynamic range of the device is limited from above only by the parameters of the element base. I il. with s (l j ed

Description

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The invention relates to electrical measuring equipment and can be used to transform the time scale of repetitive electrical signals in automated measuring systems.

The aim of the invention is to expand the dynamic range.

The drawing shows a structural electrical circuit of the proposed device.

The device consists of a voltage differential generator 1, a strobe pulse generator 2, a pulse generator 3, a mixer 4, a key element 5, a storage capacitor 6, an expander 7 and a control unit 8.

The input of the voltage differential generator 1 is connected to the trigger pulse bus, and the third output is connected to the control unit 8, the strobe pulse generator 2, the outputs of which are connected to the second and third inputs of the mixer 4, the first input of which is connected to the bus of the signal being converted, a storage capacitor 6, the first plate of which is connected to the common bus, and the second plate - to the first input of the expander 7, the output of which is connected to the output signal bus, the fourth input of the mixer 4 and the first input of the expander 7, the second input of which Inen with the output of the control unit 8. The input of the key element 5 is connected to the output of the mixer 4, the output is connected to the first input of the expander 7, and the control input is connected to the output of the generator 3 pulses, the input of which is connected to the input of the voltage differential generator 1, the first and second outputs connected to the first and second inputs 2 strobe pulse former

The device works as follows.

Simultaneously with the start of the differential generator 1, the generator 3 is started. The generator 1 generates a voltage differential from which the strobe pulses of positive and negative polarity are generated in the driver 2, which control the operation of the key element of the mixer 4. Under the influence of the frame-pulses the key element of the mixer 4 transmits the signal under study for a short period of time, as a result of which 509612 occurs

capacitor 6 series (the charge value is proportional to the signal value at the moment of gating). The accumulated charge of the capacitor 6 is converted

5 by a spreader 7 in a step signal with a constant level, the amplitude of which corresponds to the magnitude of the accumulated charge. Out of the set of step signals at the output of the expanding body 7, a signal is formed whose envelope represents the signal under investigation in a transformed time scale. The operation of the mixer 4 and the expander 7 is carried out

15 synchronously.

The expander 7 is controlled by pulses from the control unit 8, which is triggered by the signal of the voltage drop generator 1. Mixer 4 and

20, the expander 7 (and also the capacitor 6) are covered by feedback loops that increase the linearity of the strobe converter.

In the driver 2 strobe pulses,

25, in addition to the main strobe pulse, parasitic oscillations are generated, caused by the reflections in the driver 2 itself, as well as between the generator 1 and the driver 2.

30. Therefore, the value of the dynamic range of the strobe converter is not determined by the total amplitude of the strobe pulses AQ, but by the active amplitude of Hell, which is the difference

JJ between the total amplitude of Hell strobe pulses and the maximum amplitude of spurious oscillations. Parasitic oscillations do not allow to increase the dynamic range of the strobe-transducer40

The key element 5, controlled by the pulse of the generator 3, eliminates the influence of the effect of parasitic oscillations on the charge of the storage capacitor 6. The generator 3 generates a pulse simultaneously with the formation of a strobe pulse. The duration of the pulse front generator 3

50 is 2–3 times longer than the duration of the strobe-pulse front (counting relative to the total amplitude). Therefore, when this pulse is applied to the input of the key element 5 at the time of the strobe-pulse window, the connection between the mixer 4 and the storage capacitor 6 breaks.

If the amplitude of the signal under investigation exceeds the value of A, then the signal under study will be gated with a pulse of parasitic oscillations, which is just in time for the strobe pulse. Since the beginning of the gap between the mixer 4 and the expander 7 coincides with the beginning of the impulse of parasitic oscillations, the charge that the capacitor 6 received during the time of the gate does not change with. Thus, the characteristic distortions during the conversion are eliminated, and the input signal can exceed the value of the AO, without distorting the signal form at the output of the strobe converter. In this case, the dynamic range does not depend on the magnitude of the active amplitude of the strobe pulses Hell. and can be significantly increased. Dynamic range is limited from above only by the parameters of the element base.

Claims (1)

Invention Formula A strobe electrical signal converter, containing a voltage drop generator, Compiled by V.Livshits Editor M.Kelemesh Tehred M.Hodanich Corrector I.Erdeyi ..- -. - - - - -. - - - -.... Yaakaz 4404/40 Circulation 728 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow,, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 The first input is connected to the launch pulse, and the third output is connected to the input of the control unit, the strobe pulse former, the outputs of which are connected to the second and third inputs of the mixer, the first input of which is connected to the bus of the signal being converted, a storage capacitor, the first plate which is connected to the common busbar, and the second lining is connected to the first input of the expander, the output of which is connected to the output signal bus, the fourth input of the mixer and the first input 15 an expander, the second input of which is connected to the output of the control unit, characterized in that, in order to expand the dynamic range, it is equipped with a pulse generator 20 and a key element, the input of which is connected to the mixer output, the output to the first input of the expander, and the control input - with the output of the pulse generator, the input of which is connected to the input of the voltage differential generator, the first second outputs connected to the first second inputs of the strobe pulse form generator.