SU866697A1

SU866697A1 - Phase modulator

Info

Publication number: SU866697A1
Application number: SU802884825A
Authority: SU
Inventors: Владимир Сергеевич Климов; Василий Геннадьевич Токмаков
Original assignee: Ленинградский Ордена Ленина Политехнический Институт Им.М.И.Калинина
Priority date: 1980-02-11
Filing date: 1980-02-11
Publication date: 1981-09-23

Description

II

Изобретение относитс к радиотехнике и может использоватьс дл получени модулированных по фазе колебаний в различных радиотехнических устройствах.The invention relates to radio engineering and can be used to obtain phase-modulated oscillations in various radio engineering devices.

Известен фазовый модул тор,содержащий последовательно соединенные задающий генератор, фазовращатель, первь амплитудный модул тор и сумматор , а также второй амплитудный модул тор, один вход которого соединен с выходом задающего генератора , второй вход вл етс входом модулирующего сигнала фазового модул тора, а выход которого соединен с другим входом сумматора ,A phase modulator is known that contains a series-connected master oscillator, a phase rotator, first amplitude modulator and adder, and a second amplitude modulator, one input of which is connected to the output of the master oscillator, the second input is the input of the modulating signal of the phase modulator, and whose output connected to another input of the adder,

Однако в выходном сигнале известного устройства гфисутствуют значительные нелинейные искажени при наличии его паразигной амплитудной .модул ции.However, in the output signal of a known device, there are no significant non-linear distortions in the presence of its parasite amplitude modulation.

Цель изобретени - уменьшение нелинейных искажений при одновременном уменьщении паразитной амплитудной модул ции.The purpose of the invention is to reduce nonlinear distortion while reducing parasitic amplitude modulation.

Поставленна цель достигаетс тем, что в фазовый модул тор, содержащий последовательно соединенные задающий генератор, фазовращатель, ,первый амплитудный модул тор- и сумматор, а также второй амплитудный модул тор, один вход которого соединен с выходом задак дего The goal is achieved by the fact that a phase modulator containing a series-connected master oscillator, a phase rotator, the first amplitude modulator torus and an adder, and a second amplitude modulator, one input of which is connected to the output

10 генератора, второй вход вл етс входом модулирующего сигнала фазового модул тора, а выход которого соединен с другам входом сумматора, введен двухполупериодный выпр митель, 10, the second input is the input of the modulating signal of the phase modulator, and the output of which is connected to the other input of the adder, a full-wave rectifier is inputted

15 вход которого объединен с вторым входом второго амплитудного модул тора , а выход подключен к второму входу первого амплитудного модул тора .The 15 input of which is combined with the second input of the second amplitude modulator, and the output is connected to the second input of the first amplitude modulator.

2020

Claims

FIG. 1 term Jftena structural electrical circuit of the phase modulator; 2 and 3 are diagrams showing its operation. The phase modulator contains the master oscillator I, the phase shifter 2, the first 3 and second 4 amplitude modulators, the adder 5 and the full-wave rectifier 6. The phase modulator operates as follows. The output signal from the master oscillator 1 of the carrier frequency is fed through the phase shifter 2 by 90 to the first amplitude modulator 3 and directly to the second amplitude modulator 4, for which it is advisable to use a balanced modulator. The modulating signal is fed to the second input of the amplitude modulator 4 directly, and to the second input of the amplitude modulator 3 via a two-half-cycle rectifier 6, whose function is a two-wavelength rectification of the modular signal with preservation of the constant component, the phase modulus is better and smaller parasitic amplitude modulation are achieved by modulating the OA vector according to the law of the modulating signal (Fig. 3). The modulation depth of the OA vector is determined from the condition of equality of the amplitudes at H 0 and 4, (OCj). From Fig. 2 it can be seen that the voltage at the output of the adder 5 (J (OS) is determined by the geometric sum of the vector C, (OB) is balanced modulator 4, which varies according to the law and VX and the vector of the amplitude modulator 3 (Fig. 3)., U, iVa. (- K / Xi ;, where X t and -1 x I; К -. coefficient modulus voltage Uj - maximum voltage amplitudes and and DI.,) H.Va (08i) 74 From the vector diagram (figure 2 it can be seen that for a given maximum angle of phase modulation f K 1 - Cosyt, and the law of change of the angle V,. (51-p.) .: p: Otno The minimum amplitude of the OC to the maximum OAfj OSL lEl.cos J. ОАО, 1 The invention allows to significantly reduce the nonlinear distortion while reducing the parasitic PMPL modulation. Phase modulator containing sequentially connected master oscillator, phase shifter, first amplitude modulator and phase modulator the adder as well as the second amplitude modulator, one input of which is connected to the output of the master oscillator, the second input is the input of the modulating signal of the phase modulus, and the output of which Connected to another input of the adder, reproducing so that, in order to reduce nonlinear distortion while reducing the parasitic amplitude modulation, a full-wave rectifier is inputted, the input of which is combined with the second input of the second amplitude modulator, and the output is connected to the second input of the first amplitude modulator. Sources of information taken into account during the examination 1. Ye. M. Vereshchagin. and Nikitenko Yu.G. Frequency and phase modulation in communication technology. M., Holy Hour, 1974, p. 127 (prototype).

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