SU74169A1 - An apparatus for producing periodic pulses of adjustable shape - Google Patents

Description

The subject matter of the present invention relates to devices for producing periodic pulses of adjustable shape.

The peculiarity of the proposed device is the line of the chain of upset one with respect to the other band-pass filters with detectors connected to them, the mains-loads that are connected to the next-to-O and connected to the high-frequency generator.

FIG. I depicts a schematic circuit diagram of the present. the device itself; in fig. 2-graphs, explaining the principle of the generator.

The device consists of a generator - 1, which gives a voltage of a saw-shaped form, the oscillation period of which is equal to the period of drifting pulses; The frequency of the high frequency generator 2, whose frequency is modulated by the sawtooth voltage and changes linearly in time with the frequency of the pulses received; bandpass filters-3 associated with a frequency modulated oscillator-m. Each filter is tuned to its resonant frequency so that the resonant frequencies of adjacent filters are slightly different from each other. The average frequency of the frequency modules of the PoBaiHHoro generator is much higher than the frequency of the pulses, which is. It is not necessary to get arbitrary pulses from the generator.

Each filter is loaded on a separate detector-4, load resistances -5, which are connected in series-. The total rectified voltage, taken from the loads of the detectors, was applied to the grid of the amplifying lamp-L.

When applying a sawtooth voltage to a frequency-modulated oscillator, the frequency of the latter varies linearly with time, and the voltage amplitude at the output is constant.

When this voltage is applied to a bandpass filter, the rectified voltage on the load of the cell detector has the form of a resonant curve of the bandpass filter.

By changing the voltage of the high frequency supplied to the input of the individual bandpass filters, or by changing the connection between the circuits of the filters, the rectified 157

the voltage on the detector load, and thus the voltage in C01 for the relevant part of the period. The principle of operation of the generator. Is explained by the graphs in FIG. 2 for five bandpass filters. FIG. Figures 26 and 2c show the approximate shapes of two types of arrays of pulses obtained from the generator (triangular and step).

FIG. Figure 2a shows the voltages taken from the load of each of the detectors (dotted line), and the total voltage (solid line).

The number of different pulse shapes is determined by the expression / g, where m is the number of band-pass filters, h is the number of steps; the levels of adjustment of the input voltage or coupling coefficient between the circuits.

The proposed device allows to obtain arbitrary pulses in a wide frequency range.

Subject invention

A device for obtaining periodic pulses of adjustable shape from sawtooth pulses, which are used with a chain of bandpass filters distorted one with respect to another with connection, YHHIM detectors connected in series, with bandpass filters having weak adjustable coupling to a high frequency oscillator, the frequency of which is modulated by a control sawtooth voltage.

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No. 74169