SU894842A1 - Bell-shaped pulse shaping device - Google Patents

Description

(54) DEVICE FOR THE FORMATION OF PULSE BULBS

The invention relates to impulse technology and can be used to form video and radio pulses. A device for generating bell-shaped pulses is known, comprising a generator of special signals and a non-linear functional transducer; GP The disadvantage of the device is low speed. A device for forming bell-shaped pulses is known. Containing in series with a combined pulse generator and modulating voltage generator, voltage-to-frequency converter, band-pass filter, amplitude detector, differentiator and threshold element, the differentiator input is connected to the control input of the modulator voltage generator 1h 2. The disadvantage of the device is the low accuracy of the formation of bell-shaped pulses. The purpose of the invention is to improve the accuracy of forming a bell-shaped pulse. The goal is achieved in that a bell-shaped pulse shaping device comprising a nepBbdi band-pass filter, an envelope detector, a series-connected sync pulse generator and a gating pulse generator and a modulating voltage generator introduced in series-connected buffer cascade, a second band-pass filter, a gating cascade whose output connected to the input of the envelope detector, the second input to the second output of the generator of synchronization and gating pulses, a sinusoid generator signal, the output of which is connected to the first input of the first band-pass filter, the second

the input of which is connected to the second input of the second band-pass filter and the output of the generator of modulating voltage, and the output to the input of the buffer stage.

The drawing shows a structural diagram of the device.

The device contains a series-connected sinusoidal signal generator 1, a first band-pass filter 2, a buffer cascade 3, a second band-pass filter 4, a gating cascade 5, and an envelope detector 6 The device also includes successively connected generators 7 and 8 of synchronization and gating pulses, and the second inputs of the bandpass filters are connected to the output of the generator 8 of modulating voltage, and the second input of the cascade 5 gating is connected to the second output of the generator 7 synchronous pulses tion and gating.

The device works in the following way.

Bell-shaped pulses are achieved by sequentially passing a sinusoidal signal of generator 1 through two tunable band-pass filters with a common bell-shaped characteristic of the type), f - const, where j (,, is the voltage at the output of the second band filter, OyHy. and the second inputs of the filters, Ugx amplitude and frequency of the sinusoidal signal at the first input of the first band-pass filter.

The band-pass filters are identical in characteristics, pre-upset in frequency in different directions from the frequency of the sinusoidal signal, KOTOiHje are then tuned in frequency towards each other.

A continuous high-frequency sinusoidal signal from the generator output is fed to the input of the first band-pass filter 2, then through the buffer cascade 3 to the second band-pass filter 4. The filter is tuned by modulating the voltage of the sawtooth generator 8, which is triggered by generator synchronization pulses 7.

From the output of the filter 4, a modulated high-frequency signal with a bell-shaped envelope is fed to the first input of the gating cascade 5, to the second input of which a gating pulse is fed from the output of the generator 7. From the output of the gating cascade, high-frequency pulses with the required front and back fronts are fed to the input of the detector 6 where the envelopes of the input pulses are allocated.

The device allows to reduce. amplitude-time distortion of the formed bell-shaped pulses 5 forms for. the score is also provided by the symmetry of the signal envelope at the output of the second filter, the precise formation of the pulse front. This is due to the device's ability to detuning and tuning the filters in frequency to meet each other. Asym, the pulse metrics are reduced by multiplying the filter gains.

Claims (2)

Invention Formula A device for forming a bell-shaped pulses, containing a band-pass filter, an envelope detector, a series-connected synchronization and gating pulse generator and a modulating voltage generator, which is designed so that, in order to increase the accuracy of the formation of output pulses, serially connected buffer cascade, second band-pass filter, gating cascade, the output of which is connected to the envelope joieTeKTopa input, the second input - to the second output of the synchronous pulse generator are introduced gating, a sinusoidal signal generator, the output of which is connected to the first input of the first band pass, the second input of which is connected to the second input of the second band pass filter and the output of the modulating voltage generator, and the output to the input of the buffer stage. Sources of information taken into account in the examination . USSR Author's Certificate 5 No. 499657, cl. H 03 K 4/92, 1976. 2. USSR author's certificate No. 687572, cl. H 03 K 4/92, 1979.