SU1322409A1 - Generator of modulated signal - Google Patents

Abstract

The invention relates to the field of radio engineering and can be used in radio transmission systems and as radio signal simulators. The purpose of the invention is to reduce the nonlinear distortion of the modulated oscillations due to the synchronization of the harmonic oscillator and the control signals of a discretely controlled attenuator. For this, a pulse shaper 5, a pulse frequency multiplier 6 and a register 9 are additionally introduced into the device. In addition, the device contains a harmonic oscillator 1, a discretely controlled attenuator 2 consisting of a voltage divider 3 and a block of 4 analog switches, counter 7 decoder 8, encoding input bus 14 and output bus 15, phase manipulator 10 including phase shifters 11 and 12 and block 13 of analog switches. 1 il. (L 11 from to to 4; about with

Description

The invention relates to radio engineering and can be used in radio transmitting systems and as radio signal simulators.

The aim of the invention is to reduce the non-linear distortions of modulated oscillations by synchronizing the generator of harmonic oscillations and control signals of a discretely controlled attenuator.

The drawing shows a functional diagram of the device.

The modulated signal generator contains 1 harmonic oscillator, a discretely controlled attenuator 2 consisting of a voltage divider 3 and an analog key block 4, in addition the device contains a pulse shaper 5, a pulse frequency multiplier 6, a counter 7, depfractor 8, a register 9, a phase manipulator 10 comprising phase shifters 11 and 12 and an analog switch block 13, a coding input bus 14 and an output bus 15.

The output of the harmonic oscillator 1 is connected to the high-frequency input of the discretely controlled attenuator 2 and, via connected in series, the pulse shaper 5 and the multiplier 6, their frequency with the counting input of the counter. 7, the code outputs of which are connected via the decoder 8 to the corresponding control inputs of discretely controlled attenuator 2, and the overflow output of counter 7, via register 9, is connected to the control input of phase manipulator 10, the high-frequency input of which is connected to the output of discretely controlled attenuator 2, phase output the modulator 10 is connected to the output bus 15, and the control inputs of the register 9 are connected to the 14-coding bus.

Shaper modulating signal works as follows.

The output voltage from the harmonic oscillator 1 is fed to a high-frequency input of a discretely controlled attenuator 2 which can be made to: the form of a resistive voltage divider 3, the outputs of which are switched by the unit 4 and the auxiliary input of the counter 7 pulses. The output of counter 7, which is a binary code, is converted by decoder 8 into a control code f. Attentively controlled attenuator 2, pr) and this switching of analog keys of block 4 occurs at the moment of the end of the oscillation period of oscillator 1 of harmonic oscillations when refO section of zero level sinusoid (sini / 0), while there are no phase jumps in the amplitude-modulated signal at the output discretely -controlled attenuator 2.

} 5 The overflow signal of the counter 5 through the register 9 enters the control input of the phase shift pad, the output of which amplitude-modulated signal jumps, in accordance with the code fed to the input coding bus 14 of the register 9, changes the oscillation phase by 180 ° . The phase manipulator 10 contains a phase shifter 12, the output signals of which have a relative phase shift of 180 ° and are alternately switched by the analog keys of unit 13, which are controlled by antiphase signals from the outputs of the phase shifter 11 11,

Claims (1)

Invention Formula Shaper mode; (ized signal, containing discretely controlled I lbm attenuator S counter, decoder, phase handler and harmonic generator, the output of which is connected to the high-frequency input 40 discretely controlled attenuator, the output of which is connected to the high-frequency input of the phase manipulator, and the control inputs of the discretely controlled attenuator are connected to the corresponding outputs of the decoder, the inputs of which are connected to the corresponding code outputs of the counter, and the output of the phase modulator connected to the output by the device bus, which is different from the fact that, in order to reduce the nonlinear distortions of the modulated oscillator due to the synchronization of the harmonic oscillator and disc control signals At the same time, the output keys 55 of the controlled attenuator were simultaneously inputted, the signal of the harmonic pulse coaxial generator 1, the multiplier of the oscillations through the impulse generator 5 of the pulse-frequency of the pulse following and the pulse of the second, the clock input of which connects the pulses into two Enters the counting yen with a counter overflow output. 1322409 input counter 7 pulses. The output signal of the counter 7, which is a binary code, is converted by the decoder 8 into the control code of the discretely controlled attenuator 2, etc.) and the switching of the analog keys of the block 4 occurs at the moment of the end of the oscillation period of the harmonic oscillator 1 at the intersection of the zero level sinusoid (sini / 0), while there are no phase jumps in the amplitude-modulated signal at the output of the discrete-controlled attenuator 2. The overflow signal of the counter 5 through the register 9 enters the control input of the phase shift key, the output of which amplitude-modulated signal jumps, in accordance with the code fed to the input coding bus 14 of the register 9, changes the oscillation phase by 180 °. The phase manipulator 10 contains a phase shifter 12, the output signals of which have a relative phase shift of 180 ° and are alternately switched by analog keys of unit 13, which are controlled by antiphase signals from the outputs of the phase shifter 11, Invention Formula Shaper mode; (ized signal containing discretely controlled e-I lbm attenuator S counter, decoder, phase manipulator and harmonic oscillator, the output of which is connected to the high-frequency input discretely controlled attenuator, the output of which is connected to the high-frequency input of the phase manipulator, and the control inputs of the discretely controlled attenuator are connected to the corresponding outputs of the decoder, the inputs of which are connected to the corresponding code outputs of the counter, and the output of the phase modulator connected to the output bus of the device , it is also distinguished by the fact that, in order to reduce the nonlinear distortion of the modulated oscillator due to synchronization of the harmonic oscillator 31322А094 the register output is connected to the input of oscillations through the connected phase manipulator ratios, the inputs are therefore the register control pulse shaper is connected to the coaxes and the frequency multiplier by their respective corresponding control input buses connected to the counting one, the counting input , and the output of the harmonic generator.