SU1265630A1 - Square pulse amplitude-to-direct voltage converter - Google Patents

Abstract

This invention relates to a jc measurement technique. The purpose of the invention is improving the speed of the device. The converter contains a differential amplifier 1, a divider 2 voltage, a comparator 3, a diode-capacitive charging cell 5, a charging switch 7, and a repeater 8 voltage. The introduction of element 6 and threshold block 4 allows one to more quickly reduce the output voltage with decreasing amplitude of the input pulses without increasing the output voltage ripple at a constant amplitude of the input pulses. In addition, the presence of high-resistance circuits connected to the capacitor of the diode-capacitive charge cell 5 ensures good preservation of the accumulated charge in the pauses between pulses. As a result, the envelope of pulse sequences can be distinguished over a wide range of periods, which expands the scope of application of the converter. 2 Il.

Description

UNION OF ADVISORS

SOCIALIST

REPUBLIC <,,, SU 1265630 A1

USSR STATE COMMITTEE FOR CASES OF INVENTIONS AND OPENINGS

DESCRIPTION OF THE INVENTION

AUTHOR CERTIFICATE

(21) 3801543 / 24-21 (22) 10/15/84 (46) 10/23/86. Bull. No. 39 (72) V.V. Nemirov and A.I. Ivanov (53) 621.317.32 (088.8) (56) USSR Copyright Certificate No. 815651, cl. G 01 R 19/04, 1979.

USSR copyright certificate No. 849083, cl. G 01 R 19/04, 1979.

(54) CONVERTER OF AMPLITUDE OF RECTANGULAR PULSE TO DC VOLTAGE (57) The invention relates to measuring technique. The purpose of the invention is; improving the performance of the device. The converter contains a differential amplifier 1, a voltage divider 2, a comparator 3, a diode-capacitive charging cell 5, a charging key 7 and a voltage follower 8. The introduction of the Ibi element of the threshold block 4 allows you to more quickly reduce the output voltage with a decreasing amplitude of the input pulses without increasing the ripple of the output voltage at a constant amplitude of the input pulses. In addition, the presence of high-resistance circuits connected to the capacitor of the diode-capacitive charging cell 5, ensures good conservation of the accumulated charge in the pauses between pulses. As a result, it’s possible to isolate the envelope of pulse sequences in a wide range of duty cycles, which expands the scope of the converter. 2 ill.

SU „1265630

4kg. 1

The invention 'relates to measuring equipment and can be used to measure the amplitude of a pulse signal. With a pulse shape close to rectangular.

The purpose of the invention is the increase in speed achieved by more quickly reducing its output voltage with decreasing amplitude of the input pulses, without increasing the ripple of the output voltage at a constant amplitude of the input pulses.

Figure 1 shows the functional diagram of the device, figure 2 - time diagrams of its operation.

The device comprises a differential amplifier 1, a voltage divider 2, a comparator 3, a threshold block

4, diode capacitive charging cell

5, element And 6, a bit key 7 and a voltage follower 8, the output of which is the output of the device.

'The output of the differential amplifier 1 is connected through the cell 5 with the input of the repeater 8 and the output of the key 7, the output ^{1 of} the repeater 8 is connected to the inverting input of the differential amplifier 1 and through the divider 2 to the first input of the comparator 3. The inputs of the element And 6 are connected to the outputs of the comparator 3 and the threshold unit 4, and the output, the output · - with the control input of the key 7. The non-inverting input of the differential amplifier 1, the second input of the comparator 3 and the input of the threshold unit 4 are connected to the input bus 9.

The device operates as follows.

In the steady state, pulses of positive polarity are fed to the input bus 9 (Fig.2a) and through the differential amplifier 1 (Fig.26) • charge the capacitor of the cell 5 to a value equal to the amplitude of the input pulses. The voltage from the capacitor through the voltage follower 8 and divider 2, the transmission coefficient of which is chosen slightly less than unity, so that in steady state the voltage at its output is always slightly less than the amplitude of the input im-; pulses, is fed to the non-inverting input of the comparator 3, to the inverting input of which input pulses are received. Since the voltage at the non-inverting input of the comparator 3 due to the action of the divider 2 is less than the amplitude of the input pulses, the output of the comparator 3 produces a zero voltage drop for each pulse (Fig.2d), which holds the discharge key 7 through 5 And 6 element (Fig.2e) closed condition. With an increase in the amplitude of the input pulses, the state of the comparator 3 does not change, and the discharge key 7 remains in the closed 10 state. In this case, the capacitor 'of the cell 5 is charged to a voltage equal to the amplitude of the input pulses, which are transmitted through the voltage follower 8 (Fig.2c) to the output of the device.

In the pauses between pulses, the voltage at the output of the threshold unit 4 (Fig. 2d) takes a zero value and, through the And 6 element, holds the bit switch 7 in the closed state.

When the amplitude of the input pulses decreases, the comparator 3 generates a positive voltage drop, which, together with a positive voltage level 25 at the output of the threshold unit 4 through the And 6 element, opens the discharge key 7. This leads to the discharge of the cell capacitor 5 to a voltage equal to the amplitude of the input pulses, 30 after which the comparator 3 goes to zero and closes the bit key 7.

Thus, the proposed converter quickly monitors the change in the amplitude of the input pulses of a rectangular shape, and the high rate of change of the output voltage is due to the forced charge and discharge of the storage capacitor. On the other hand, the presence of high-resistance circuits connected to the capacitor of the diode-capacitive cell ensures good storage of the accumulated charge of ⁴⁵ da in the pauses between pulses. As a result, it becomes possible to isolate the envelope of the pulse sequences in a wide range of duty cycles, which expands the scope of the proposed device.

Claims (1)

The invention relates to a measuring technique and can be used to measure the amplitude of a pulsed signal with a pulse shape that is close to rectangular. The purpose of the invention is to increase the speed of response, achieved due to a more rapid decrease in its output voltage with decreasing amplitude of the input pulses, without increasing the ripple of the output voltage at a constant amplitude of the input pulses. Figure 1 shows the functional diagram of the device, figure 2 shows the time diagrams of its operation. The device comprises a differential amplifier 15, a voltage divider 2, a comparator 3, a threshold unit 4, a diode-capacitive charging cell 5, an element 6, a bit switch 7 and a voltage follower 8, the output of which is the output of the device. The output of the differential amplifier 1 is connected via cell 5 to the input of repeater 8 and the output of switch 7, the output of repeater 8 is connected to the inverting input of the differential amplifier 1 and through divider 2 to the first input of comparator 3. The inputs of element 6 are connected to the outputs of comparator 3 and the threshold unit 4, and the output - with the control input of the key 7. The non-inverting input of the differential amplifier 1J the second input of the comparator 3 and the input of the threshold unit 4 are connected to the input bus 9. The device operates as follows. . In the steady state mode, the positive-polarity pulses arrive at the input bus 9 (Fig. 2a) and, through the differential amplifier 1 (FIG. 26), charge the capacitor of the cell 5 to a value equal to the amplitude of the input pulses. The voltage from the capacitor through the voltage follower 8 and the divider 2, the coefficient transferred to which is chosen slightly less than one, so that in the steady state the voltage at its output was always slightly less than the amplitude of the input im-; pulses, enters the non-inverting input of the comparator 3, on the inverting input of which inputs are input imguls. Since, the voltage on the non-rotating input of the comparator 3 due to the effect of divider 2 is smaller than the amplitude of the input pulses, the output of the comparator 3 for each pulse produces a zero voltage drop (FIG. 2d), which through the AND 6 element (FIG. 2e) keeps the discharge key 7 in the closed state. With an increase in the amplitude of the input pulses, the state of the comparator 3 does not change, and the bit 7 remains in the closed state. In this case, the capacitor of the cell 5 is charged to a voltage equal to the amplitude of the input pulses, which is transmitted via the voltage repeater 8 (Fig. 2B) to the output of the device. In the pauses between pulses, the voltage at the output of the threshold unit 4 (Fig. 2d) takes a zero value and, through element 6, keeps the discharge key 7 in the closed state. When the amplitude of the input pulses decreases, the comparator 3 generates a positive voltage drop, which, together with the positive voltage level at the output of the threshold block 4 through the AND 6 element, opens the bit switch 7. This leads to the discharge of the Cell 5 capacitor to a voltage equal to the amplitude the input pulses, after which the comparator 3 goes to the zero state and closes the bit switch 7. Thus, the proposed converter quickly tracks the change in the amplitude of the input rectangular pulses, than the high rate of change of output voltage due to positive charge and discharge the storage capacitor. On the other hand, the presence of high-resistance circuits connected to the capacitor of the diode-capacitive cell ensures good preservation of the accumulated charge in the pauses between pulses. As a result, the envelope of pulse sequences can be distributed over a wide range of duty periods, which expands the scope of application of the proposed device. The formula of the image is an Amplitude transducer of rectangular pulses into a DC voltage, containing a voltage divider, a comparator, a bit switch, and a series-connected differential amplifier, diode capacitance charging cell, and voltage follower, the output of which is connected to output bus, inverting, the input of the differential amplifier and through the voltage divider to the first input of the comparator, the second input of which is connected to the input bus and the non-inverting input of the differential amplifier and the output of the bit switch is connected to the input of the voltage follower, characterized in that, in order to improve performance, an AND element and a threshold unit are inputted, the input of which is connected by an input bus and the inputs of the AND element are connected to the outputs of the comparator and threshold unit and its output is with the control input of the dongle key.