SU832700A1 - Peak detecting device - Google Patents

Description

The invention relates to radio engineering and can be used to detect pulse signals.

A device for peak detection is known, comprising a series-connected emigrant repeater, a peak detector. a torus on a transistor connected in a circuit with a common emitter, and a buffer amplifier, to the output of which voltage divider 1 is connected.

 However, the reliability of the known device is limited due to u) about the peak transistor detector with high input signal levels ...

The purpose of the invention is to increase the reliability of operation by eliminating the sample of the transistor of the peak detector at high levels of the input signal.

The goal is achieved by the fact that in a device containing a series-connected zmitter follower, a peak detector on a transistor wired according to a common emitter circuit, and a buffer amplifier, to the output of which the dividers are connected. Hanggr

between the input divider and the single emitter input and the emitter follower inlet, a starter unit is turned on, the second input of which is the device input.

The drawing shows a structural diagram of a 1-phase device. .

The device contains a block 1 of auto selector 1, FOR a “gage repeater 2, a peak detector 3 consisting of a transistor 4 and a capacitor buffer amplifier 6 and a voltage divider 7.

The device works as follows.

In the initial state, the capacitor is 5 discharges. The positive impulse of the input cable passes through the block 1 to the input of the zmittny repeater 2 due to the fact that (the output of the divider 7 is close to zero, and 6iioK 1 passes the largest of the input voltages to its gateway.

The constant charge time of the capacitor 5 is chosen sufficiently small for the parameters of the transistor 4, and the time constant is chosen as long as possible for

which in the buffer amplifier 6 uses a field effect transistor.

The minimum voltage required to operate the peak detector is approximately equal to the voltage drop across the open transistor 4, i.e. 0.5 V.

Capacitor 5 is charged up to a voltage equal to the maximum voltage of the input pulse, and part of this voltage after delnggel 7 is fed to the second input of block 1. Since the voltage at the second input of the block is less than the voltage of the input pulse, it does not affect the operation devices.

In the absence of a pulse, the input voltage of the device, available at the second input of block 1, passes through the emitter follower 2 to the base of transistor 4 and closes the transistor 4. By selecting the gain factor of the divider 7, the voltage closing the transistor 4 is chosen not exceeding the maximum allowable voltage transistor 4. For example, when the amplitude of the input pulse is 20V, you can get the closing transistor voltage not exceeding 3-4 V. Thus, reliability

operation due to the exclusion of the transistor 4 of a gshkovy detector 3 at high levels of the input signal.

Claims (1)

Invention Formula A device for peak detection, comprising a series-connected zmitter follower, a peak detector on a transistor connected in a common emitter circuit, and a buffer amplifier, to the output of which a voltage divider is connected, in order to increase reliability by eliminating a transistor sample A peak detector at high levels of the input signal, between the output of the voltage divider and the input of the emitter follower, is included a block for auto selection, the second input of which is the input of the device properties. Sources of information taken into account in the examination 1. US Patent No. 3430072, cl. 307-250, 1969 (prototype).