SU660236A1 - Linear frequency-modulated generator - Google Patents

Description

one

This invention relates to a signal generation technique and can be used in measuring devices.

A known signal generator with linear frequency modulation, containing a source of pulses and a frequency divider 1.

The disadvantage of this linear frequency modulated signal generator is the limited set of output signals simultaneously generated by the device.

A linear frequency modulated signal generator is also known that contains a source of pulses, a counter, short pulse drivers, and a driver that are connected to the outputs of short pulse drivers, each input connected to one of the counter outputs, which is connected to the output of a pulse source 2 .

The disadvantage of this device is the impossibility of obtaining a multi-phase signal with this device.

The purpose of the invention is to obtain a multi-phase signal.

The goal is achieved by the fact that the signal generator with linear frequency modulation, containing a source of pulses, a counter, shapers of short pulses and a shaper, inputs connected to the outputs of the drivers

short pulses, the input of each of which is connected to one of the outputs of the counters, the input associated with the output of the pulse source, a register and signal conditioners, whose inputs are connected to the outputs of the short pulse drivers, are added, the register input is connected to the output of the pulse source, and the register outputs with clock inputs

signal conditioners. Each signal conditioner contains a counting node, AND elements, an OR element and a divider, the output and input of which are connected to the output of the signal conditioner and the output of the OR element, the inputs connected to the outputs of the AND elements, the first inputs of which are connected to the inputs of the signal conditioner, and the second inputs the outputs of the counting node whose input is associated with the clock

input shaper signals.

The block diagram of the signal generator with linear frequency modulation is shown in the drawing. Linear frequency signal generator

the modulation contains a source of 1 pulses, a counter 2, drivers of 3 short pulses, drivers of 4 signals and a register 5. The inputs of drivers of 4 signals are connected to the outputs of drivers of 3

short pulses, the input of each of which is connected to one of the outputs of counter 2, and the input of the counter to the output of source 1 of pulses. The input of the register 5 is connected to the output of the source of 1 pulses, and the outputs of the register 5 to the clock inputs of the drivers of 4 signals. Each shaper 4 signals contains a counting node 6, the elements And 7, the element OR 8 and the divider 9, the output and input of which are connected respectively to the output 10 of the signal shaper and the output of the element OR 8, the inputs connected to the outputs of the elements And 7, the first inputs of which are connected to the inputs of the imaging unit 4 signals, and the second inputs with the outputs of the counting node 6, the input of which is connected with the clock input of the imaging unit 4 signals.

The signal generator with linear frequency modulation operates as follows.

The pulses from the source 1 of the pulses arrive at the counter 2 and the register 5, which generates the clock signals of the drivers 4. The output signals from the outputs of the counter 2 pass through the drivers of the 3 short pulses to the first inputs of the And 7 elements. In this case, the logical signals from the outputs of the counting nodes 6, to the second inputs of the And 7 elements, the passage through these elements of the pulses from the outputs of the formers 3 to the inputs of the OR elements 8 is allowed, at the output of which a sequence of short pulses with an average th frequency varying linearly. Since the clock inputs of the drivers of the 4 signals are connected to different outputs of the register 5, the output pulse sequences counted by the counting nodes 6 are shifted in phase. This leads to the fact that the pulse sequences at the outputs of the elements OR 8 and at the outputs of the dividers 9, which eliminate the unevenness of the output pulses, are phase-shifted.

Thus, at the outputs of dividers 9, uniform phase-shifted pulse sequences are selected, the frequency of which varies linearly.

Claims (2)

1. A signal generator with linear frequency modulation, containing a source of pulses, a counter, shapers short pulses and a signal conditioner, the inputs of which are connected to the outputs of short pulse drivers, the input of each of which is connected to one of the outputs of the counter, the input of which is connected to the output of the pulse source, characterized in that, in order to obtain a multiphase signal, a register and drivers of signals whose inputs are connected to the outputs of short pulse drivers, the input of the register is connected to the output of the source of pulses, and the outputs of the register are connected to the clock inputs of the driver th signals. 2. The generator according to claim 1, characterized in that the signal conditioner comprises a counting node, an AND element, an OR element and a divider, the output and input of which are connected to the output of the signal conditioner and the output of the OR element, whose inputs are connected to the outputs of the AND elements, the first inputs which are connected to the inputs of the signal conditioner, and the second inputs are connected to the outputs of the counting node, whose input connected to the clock input of the signal conditioner. Sources of information taken into account in the examination 1. USSR Author's Certificate No. 278251, cl. And OZK 13/02, 1969. 2. Mrachnovskiy O. D., Partala O. N. Digital chirp signal generator. - Sat. "Instruments and means of automation, Kiev," Paukova Dumka, 1974, p. 118.