SU760478A1 - Standard phase-modulated oscillation shaper - Google Patents

Description

one

The device relates to the field of radio communications and telemetry and can be used to form phase-modulated oscillations with. stable phase modulation index. five

Known devices for the formation of phase-modulated oscillations, containing a reference and controlled ge-. nerators, a linear phase detector, and a two frequency divider with the same K division factors, connected between the oscillators and the inputs of the phase detector, and a CTI smoothing filter, the phase modulator has a low phase index stability ^! duplication. .. · ·

A known system for the formation of phase modulated oscillations with a given 2 '• phase modulation index, comprising a phase, detector, amplifier, phase modulator, master oscillator, the output of which is connected to the input of the phase modulator [2]. 2

A disadvantage of this device is the low stability of the index.

phase modulation ·.

The purpose of the invention is to increase the stability of the phase modulation index. 3

2

This goal is achieved by the fact that the device containing the phase detector, amplifier, phase mode. The oscillator, the master oscillator, the output of which is connected to the input of the phase modulator, is entered a phase shifter, a key, an integrator, a voltage divider, a modulated signal driver, and a control circuit;

) the input of the phase shifter is connected to the output of the master oscillator, the output of the phase shifter is connected to the first input of the fan detector, the second input of which. connected to the output of the phase MO; dulator and bus output. The output of the phase detector is connected in series to the key, the integrator and the amplifier connected to the control input of a voltage divider,

Signal input 3: through which the modulated signal shaper is connected to the input signal bus, the second output of the modulating signal shaper is connected via the control unit to the control input of the key, the output of the voltage divider is connected to the control input of the phase mode. lator.

¹ Figure 1 shows the block diagram of the proposed device; Figure 2a-e-760478

'Menna diagrams explaining its ra_ _l bot.

Shaper exemplary fazomo '''/"N n rovanyyh' oscillations comprises e'a 'giving the generator 1, the phase shifter 2, the phase modulator 3, the phase detector _ς Torr (PD) 4, switch 5, integrator6 ⁵

an amplifier 7, a voltage divider 8, a modulated wave shaper 9, and a control unit 10. The output of the master oscillator 1 is connected by the signal input of the phase modulator 3 and the input of the phase shifter 2, the output of the phase modulator '3 is connected to the output signal bus and via the serially connected phase detector 4, key 5, integrator 6, amplifier' 5 7, to the control input of the divider 8 voltage. The output of the phase shifter 2 is connected to the second input of the phase detector 4, the input of the modulating signal of the phase modulator 3 through the voltage separator 8 and the imaging unit 9 of the modulated signal with the input signal bus, the second output of the imaging unit 9 through the control unit 10- * with the control input of the key 5 25

The shaper of the exemplary phase-modulated oscillation works as follows.

The signal from the master oscillator 1 'g y ( _d y-0 _o so'5So _o ί is fed to the phase warp *''here

the gate 2 and the high-frequency input of the phase modulator 3; The modulating signal and _m0 "(ι) = 35 are fed through the controlled voltage divider 8 to the other input of the phase modulator 3

41 p Β (ί) from the former 9, the voltage phase at the output of the phase module is modulated according to the change of modulating voltage and described by the equation

(ι) 5θ ₀ οο5 | ω ₀ ί 1) θ

where u _o I + h \ _g is the phase component · of ^{1, which} varies linearly - by law;

K · and “KO- component of the phase, changing according to the law of voltage 45;

K-AND = PM - the index of phase modulation; . ·· '- ··:

_ 15 is the proportion ratio of IALITY; ' 50

phase component arising in a phase modulator in the case when its modulation characteristic differs from linear, and for other reasons.

Phase-modulated signal (1) from the output of phase modulator 3 is fed to one input of phase detector 4. Voltage 60 passes to the other input

• from master oscillator 1 via phase shifter 2.

and ₂ (ί) = 11 ° ^to _about 5 (w _of e + q '+ TM _{sr' £} p) (2)

where ~ component of the phase of s'igala, ·

the value of which is chosen depending on 65

values of ΛΨ _Μ , i.e. for compensation

The process of adjusting the phase modulation index is explained using the time diagrams shown in FIG. 2. Let the law of change of the phase of the phase-modulated signal (1) with different indices of phase modulation have the form shown in FIG. 2, a. Then the voltage at the output of the PD will vary, as shown in FIG. 2.6. at the time points corresponding to the phase of the phase-modulated signal (Fig. 2, b), the voltage from the PD output is fed to the key 5 input. At the output of the 'key' there is a signal shown in Fig. 2.1 .. This signal is a pulse sequence, the constant component of it is fed to the amplifier 7.

FIG. 2, d shows the voltage at the output of the integrator 6.

Amplified 'voltage is supplied to the control input of a controlled voltage divider 8. The amplitude of the modulating signal at the output of the integrator b of the voltage divider 8 depends on the voltage at the output of the amplifier 7. FIG. 2, e shows the modulating voltage, the amplitude of which varies under the action of the control voltage. The modulating voltage is generated by the shaper.9, which receives the information signal in the form of a binary sequence of pulses.

The use of the proposed device will improve the accuracy of maintaining the phase modulation index.

Claims (1)

Claim Shaper of exemplary phase-modulated oscillations, containing a phase detector, an amplifier, a phase modulator, a master oscillator, the output of which is connected to the input of the phase modulator, which in order to increase the stability of the phase modulation index, a phase shifter, a key, an integrator, a voltage divider, a modulated 'shaper of the signal and a control unit are entered, the phase shifter input is connected to the output of the master oscillator, the phase shifter output is connected to the first input of the phase detector, the second input of which is connected to the output of the phase modulator and to the bus the output of the NOD signal, the output of the phase detector through a serially connected switch, integrator and amplifier Connected to the control input of the voltage divider, signal5 The input of which is a modulated signal driver is connected to the input signal bus, the second output of the modulated signal driver is connected via a control unit to the control input of the key, the output of the voltage divider is connected to the control input of the phase modulator. •