SU581472A1 - Integrating device - Google Patents

Description

(54) INTEGRATING DEVICE

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The invention relates to radio engineering and can be used in receiving devices operating with signals of variable duration.

A known integrating device containing a field-effect transistor, a discharge device l.

However, such a device does not provide process integration control.

The device closest to the invention contains an amplifier, to the input of which a capacitor is connected, and between the input and output are connected two series-connected resistors, to the connection point of which a third resistor is connected, a differential amplifier, diode 2.

This device has a low speed.

The goal is to increase the speed of the device.

This is achieved by the fact that an integrating device containing an amplifier, to the input of which we turn on the capacitor, and between the input and output are connected two series-banded resistors, to the connection point k.) - the first pin of the third resistor, the differentials are connected. The loudspeaker, a diode, a field-effect transistor and an additional diode are inserted, a control voltage is applied to the non-inverting input of the differential amplifier, an inverting input is supplied by a reference voltage, the output is connected through the diode to the amplifier input and through ADDITIONAL-diode to the gate of the FET, the drain of which is connected to the input device and the second terminal of the third resistor and the source to the junction of the first and second resistors.

The drawing is a schematic electrical circuit for integrating the device.

The integrator comprises successively included integrating HC circuit 1 and amplifier 2, the output of which is the output of the device. Between the output and the input bus 3 of the integrator, a voltage divider 4 is connected, the resistors 5 and b have a midpoint of which is connected to the input of the integrating pC circuit 1, forming a feedback loop. Parallel to the resistor 5, the voltage divider 4 is connected to a field effect transistor 7, which is an adjustable element of the integrating device. To gAT u

Field-effect transistor 7 through the diode 8 is connected to the output of the differential amplifier 9 DC. The output of the differential amplifier 9 is also connected via a diode 10 and to the potential output of a capacitor, 11 Tcc-circuit 1. The inverting and non-inverting inputs of the differential amplifier 9 are connected respectively to the sources of the control 12 and the reference 13 voltage. The integrating JC circuit also contains a resistor 14.

The device works as follows.

In the initial state, when there is no useful signal on the input bus 3 of the integrating device, the capacitor 11 T of the C circuit 1 is discharged, since the diode 10 from the output of the differential amplifier 9 is supplied with a reference voltage in the forward direction of the diode 10 and the latter is open. The same voltage closes the diode 8. At the gate of the field-effect transistor 7, the bias is zero, this resistance to the drain-source analges the resistor bypass, 5 divider 4 voltage. Simultaneously with the arrival on the bus 3. of the integrating device of a useful.-Pulse signal with a given duration, a control voltage is applied to the inverting input of the differential amplifier 9, which exceeds the reference voltage and is determined by the duration of the input signal. In this case, the diode 10 is closed, the diode 8 is opened and the control voltage is supplied to the gate of the field-effect transistor 7. The drain-source resistance of the channel of the field-effect transistor 7 depends on the impedance of the control voltage; and, consequently, the time constant of the integrating device, defined as

T,

.},

also depends on the magnitude of the control voltage.

where 1 is the resistance of the resistor 14;

C - capacitor capacitance 11 g parallel connected resistors of the drain-source channel of the FET 7;

T, - resistance of the resistor 5.

After passing the useful signal pulse, the control voltage tia of the non-inverting input of the differential amplifier 9 is turned off, the diode 8 is closed, the diode 10 is opened, the capacitor 11 of the RC circuit 1 is discharged and the integrator returns to its original state.

Claims (2)

1. Vazhenina A.P., Pudrikov D.V. Transport pulse generators millisecond range. M., Sov. radio, 1974, with 2.Electronic engineennp-. 1972, June, p. 63, FIG. Bbiiiod