SU999113A1 - Gating device - Google Patents

Description

(5) CONSTRUCTION DEVICE

one

The invention is intended for gating and filtering electrical signals in geophysical equipment and can be used in inspection and experimental physics.

Known gating device with a differential filter on the RC-circuit x Cl.

The main disadvantage of it is Q, with low accuracy in transmitting the amplitude of the timed signal.

Closest to the proposed device is a second order link filter matched by J5 with a sinusoidal waveform signal, containing two integrators, an inverter, a feedback resistor, three analog switches and four clamps. The key management signals are sent to the three UCs, and the fourth is the input -J.

When processing such a filter with signals, it is necessary that the phase of the free oscillations of the filter is preserved, of a given value relative to the phase: signal, which requires an exact equality of the filter frequencies and signal, which is unattainable since there is no mutual synchronization of the signal and the phase of the free oscillations of the filter. Failure to comply with a predetermined filter oscillation phase leads to a decrease in the accuracy of signal integration.

The signal is stored after termination of gating on alternating current by continuing free oscillations in the filter. In this case, losses due to overcharging of filter integrator capacitors are inevitable, which shortens the signal storage time.

The purpose of the invention is to improve the accuracy of signal transmission.

The goal is achieved by the fact that in a gating device consisting of a series-connected first integrator consisting of a resistor, a capacitor and an operar3

first resistor is connected to the first output of the first switch, the second output of the resistor is connected to the inverting input of the operational amplifier, and a capacitor is connected between the inverting input of the operational amplifier and the output that is connected to the input of the inverter. zi, the first output of which is connected to the inverting input of the operational amplifier of the first integrator, and the second to the output of the second integrator, the second output of the first switch is connected to the output of the first int gratora, introduced the second and third analog switches, wherein; the second switch is connected in parallel with the capacitor of the first integrator, and the third switch is connected between the output of the inverter and the input of the second integrator ... lt

Information is stored on the second integrator, and since there are no oscillations in the filter during storage, there is no loss component due to overcharging of capacitors in both integrators. The integration accuracy is enhanced by the fact that the oscillation phase in the filter is set by the timing time and not

own resonance.

(.

FIG. 1 shows a functional diagram of a device strobe device as part of an apparatus using the transient process method; Fig. 2 shows timing diagrams explaining the operation of the device.

The gating device contains. first integrator 1, inverter 2, first switch 3, second integrator t, feedback resistor 5, second and third switches 6. and 7, driver 8 for control signals, current generator 9, field emitter 10, sensor 11 for field analog-digital Converter 12, block 13 of digital information processing, terminal 14.

In FIG. 2 the following notation is accepted: 1 - the current passing into the emitter 10 field and generated by the current generator 9; .E - the sigil voltage at the output of the sensor 11 floor; - timing signal; Ej signal at the output of the first integrator Ej - signal at the output of the second integrator.

134

The device works as follows.

The current generator 9 generates current pulses in the emitter 10 (Fig. 2a and starts the driver of the control signals 8 (Fig. Z6). Under the influence of the pulsed field, a transient occurs in the search object, which induces a different polarity in the sensor 11. (Fig. 2 (j). This signal enters the gate of the gating device. The shaper 8 emits the generator 9 current pulses delayed relative to them by a predetermined amount of time clock pulses that control the operation of keys 3 and 6.

The tuning frequency of the active filter-gating device is adan and is equal to fj, 1 / 2Throm where tr po The duration of the timing pulse.

From the moment when the first clock pulse is delivered, tp to tp- -trj P / 2 switch 6 is disconnected and switch 3 is closed, while both the integrator is charged by the signal Ec of sensor 11. In the second half of the duration of the clock pulse. Integrator 1 is discharged the counterphase action of the signal, feedback from the integrator 4 through the resistor 5 (Fig. 2t), at time t tp-f-Tj ppfv, the integrator 1 is discharged to O, and the integrator 3 charges to the maximum value (Fig. 26), the key 6 closes and fixes the integrator 1 in the Zero position, the key 3 opens and translates the egrator 4 in the storage mode. During the action of the subsequent timing pulses, the phase of the input signal coincides with the phase of free oscillation of the gating device, caused by the previous effects of the signal from sensor 11, and the bottom occurs. signal accumulation. After accumulating a predetermined number of signal samples, the device switches to the storage mode for the time required to convert the signal from the output of the second integrator to the code using an analog-to-digital converter 12,

Claims (3)

From the output of the analog-digital converter 12, the signal in the code goes to the digital processing unit 13 and then is output to the terminal 1. After the operation of the analog-digital converter is finished, the driver 8 outputs an erase signal to the key 7. The key 5 7 closes, disarms the integrator and prepares the device to the next accumulation cycle. The gating device allows gating and accumulation of the signal with high accuracy, gating signals with variable duty cycle, as well as producing information on DC, for example, from the output of the second integrator, and on the AC, from the outputs of the inverter or the first integrator, and allows to increase the long signal storage time. The economic effect is due to an increase in the sensitivity of the receiving equipment. / Claims of the invention A gating device consisting of a series-connected first integrator consisting of a resistor, a capacitor and an operational amplifier, the first output voltage. torus is connected to the first output of the first switch, the second output of the resistor is connected to the inverting input of the operational amplifier, and a capacitor is connected between the inverting input of the operational amplifier and the output that is connected to the input of the inverter, the second integrator and the reverse resistor connection, the first output of which is connected to the inverting input of the operational amplifier of the first integrator, and the second to the output of the second integrator, the second output of the first key is connected to the output of the first integrator, which is different from in order to improve the accuracy of signal transmission, the second and third analog switches were introduced, the second switch being connected in parallel with the capacitor of the first integrator, and the third switch connected between the output of the inverter and the input of the second integrator. Sources of information taken into account in the examination 1. A. Kondratenko, G. Shaidurov. Integrated electrical survey device CEP-M. - Geophysical equipment, issue. 37. L., Nedra, -1968, p. . . 2. Kustov OV, Lundin V. 3. Operational amplifiers in linear circuits. M., Sw., 1978, p. Uk (prototype). ABOUT