SU1424110A1 - Phase-frequency converter - Google Patents

Abstract

The invention relates to radio engineering and can be used to derive a frequency-modulated signal from a phase-modulated signal. The purpose of the invention is to extend the frequency range of the modulating signals to the RF region. The converter contains a reference r-1, a phase modulator 2, a source of 3 modulating signals, a mixer 4, 5, 6, 7, a delay line 8, a wide-band voltage 9. The mixers 4 and 5 are identical, i.e. each of them contains an analog multiplier 10, 11, respectively, and a high-pass filter (LPF) 12, 13, the parameters of which are the same. Elimination of combinational components is made by selecting high-order Chebyshev filters as LPF 12, as well as a large separation between the useful components. with a frequency Wi and a parasitic component with a frequency) at the output of the cm of the sensor 7. The width of the feedback quadrupole, whose input is the first inputs of mixers 4, 5, 6, and the output of the output of the delay line 8, allows s low-inertia converter, whereby the expandable bandwidth baseband signals to RF. 1 il. with SL C

Description

The invention relates to radio engineering and can be used to obtain a frequency-modulated signal from a phase-modulated signal.

The purpose of the invention is the expansion of the frequency range of modulating signals in the high frequency region.

The drawing shows a structural electrical diagram of the proposed phase-frequency Converter.

The phase-frequency converter contains a reference oscillator 1, a phase modulator 2, a source of 3 modulating signals, the first, third, second and fourth mixers 4,5,6,7, delay line 8, broadband amplifier 9.

Phase-frequency Converter operates as follows.

When you turn on the power source of the proposed phase-frequency converter, a signal with a frequency of? ₀ s out ·; Yes, the reference generator 1 is fed to the input of the phase modulator 2, to the input of the modulating signal of which the source 3 of the modulating signals has not yet been connected, and to the first input of the mixer 4. From the output of the phase modulator 2, the signal goes to the second input of the mixer 5. At the same time, the output broadband amplifier 9 there are signal fluctuations arriving at the first inputs of the mixer h

5.6. After conversion in the mixers 4,5,6,7, these fluctuations are fed to the input of the broadband amplifier 9, A coming first through the delay line 8. Thus, the broadband amplifier 9 will be covered by a feedback circuit, the input of which is the first inputs of the mixers 4,

5.6, and the output is the output of the delay line 8. Is this feedback loop marked .. check? four-terminal feedback ‘

3.. CHOS).

Under the conditions of the balance of phases and amplitudes in a self-oscillating system formed by a broadband amplifier 9 and a PF connected in a ring, oscillations will occur with a frequency ω, depending on the phase difference of the oscillations arriving at the first input of mixer 4 and the second input of mixer 5.

The generation frequency (J, will be related to the phase shift ν, introducing 5С

C-, where ί ¹ , k

For = _Γι1 l. -η I 'I j

P, + a

- the delay time of the signal in the filter ’, which is part of the mixer 7;

- the delay time of the signal in the delay line 8;

= t0, 1. . .η.

In this case, the broadband amplifier for the self-oscillating ring is an inverting amplifier.

With the appropriate choice of the gain of the broadband amplifier 9 so as to compensate for the losses in the self-oscillating ring, undamped oscillations will occur in the latter with a frequency determined by expression (4).

When the source 3 of the modulating signals is connected to the input of the phase modulator 2, the phase mode of the signal line applied to the second input of the mixer 5 occurs. In this case, a frequency-modulated signal with frequency deviation appears in the self-oscillating ring where with If is the phase deviation c and entering the second ;! mixer input 5.

Mixers 4 and 5 are pentin, i.e. each of them contains an analog multiplier high-pass filter 12 meters of which are the same.

At the same time, at the output of the filters there are frequencies of 12 and GZ, i.e. on ig: mixers 4 and 5 stand out with a frequency of the frequency of the signal having the output of a wide-band amplifier x where there is a place on the channel 9

The mixer 6 represents the oboe sequential. greening the analogue multiplier 14 and dir; t end; a filter 15, which suppresses the components in the vicinity of the 'mon \ Ba in the course of mixer 6, are isolated. ·! tm * r> _a :; a frequency = s, + ΐχ> _{(= (D 0} to 2 _hours, and a mixture outlet 7 -lya IME l-place signal frequency f u) »= ω.-ω,. = n>'!'

241

The combining components are eliminated by choosing high-order Chebyshev filters as high-pass filters 12 and 15, as well as a large separation between the useful component with frequency u, and the parasitic component with frequency 2C / _O + 3Se, at the output of mixer 7.

The bandwidth of the four-, θ feedback pole (POS) allows you to make the proposed phase inverter low inertia, in accordance with which it is possible to expand the frequency range of modulating signals in the high frequency region.

Claims (1)

Claim Phase-frequency converter containing a series-connected source of modulating signals and a phase modulator, a reference generator, the output of which is connected to the input of the modulated signal phase Гоι of the modulator and with the first input of the first mixer, the second mixer, the first input of which is connected to the output of the first mixer, the third and fourth mixers connected in series, as well as the delay line and amplifier, the output of which is connected to the second input of the first mixer, characterized in that, in order to expand the frequency range of the modulating signals to the high frequency region, the second input of the second mixer and the first input of the third mixer are connected to the output of the amplifier, the second input of the third mixer is connected to the output of the phases of the second modulator, the second input of the fourth mixer is connected to the output of the second mixer, the input and output of the delay line are connected respectively to the output of the fourth mixer and to the input of the amplifier, while the amplifier is made in the form of a broadband amplifier.