WO2020032821A1 - Frequency modulated frequency synthesizer in sdr applications - Google Patents

Frequency modulated frequency synthesizer in sdr applications Download PDF

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Publication number
WO2020032821A1
WO2020032821A1 PCT/RU2019/000404 RU2019000404W WO2020032821A1 WO 2020032821 A1 WO2020032821 A1 WO 2020032821A1 RU 2019000404 W RU2019000404 W RU 2019000404W WO 2020032821 A1 WO2020032821 A1 WO 2020032821A1
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WO
WIPO (PCT)
Prior art keywords
frequency
modulation
inlet
outlet
vco
Prior art date
Application number
PCT/RU2019/000404
Other languages
French (fr)
Inventor
Vladimir Aleksandrovich MAKOVIY
Nikolay Mikhailovich TIKHOMIROV
Sergey Grigoryevich ZARODIN
Stanislav Konstantinovich ROMANOV
Vladimir Nikolayevich TIKHOMIROV
Mikhail Valeryevich MATURAZOV
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Joint-Stock Company "Concern "Sozvezdie"
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Publication of WO2020032821A1 publication Critical patent/WO2020032821A1/en

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/09—Modifications of modulator for regulating the mean frequency
    • H03C3/0908—Modifications of modulator for regulating the mean frequency using a phase locked loop
    • H03C3/0941—Modifications of modulator for regulating the mean frequency using a phase locked loop applying frequency modulation at more than one point in the loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
    • H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/09—Modifications of modulator for regulating the mean frequency
    • H03C3/0908—Modifications of modulator for regulating the mean frequency using a phase locked loop
    • H03C3/095—Modifications of modulator for regulating the mean frequency using a phase locked loop applying frequency modulation to the loop in front of the voltage controlled oscillator
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/09—Modifications of modulator for regulating the mean frequency
    • H03C3/0908—Modifications of modulator for regulating the mean frequency using a phase locked loop
    • H03C3/0958—Modifications of modulator for regulating the mean frequency using a phase locked loop applying frequency modulation by varying the characteristics of the voltage controlled oscillator
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/09—Modifications of modulator for regulating the mean frequency
    • H03C3/0908—Modifications of modulator for regulating the mean frequency using a phase locked loop
    • H03C3/0966—Modifications of modulator for regulating the mean frequency using a phase locked loop modulating the reference clock
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop

Definitions

  • the invention relates to radio engineering and may be used as a frequency modulated radio transmitter exciter and receiver heterodyne without modulating signalling.
  • Frequency modulated (FM) frequency synthesizer made on a basis of the pulse-phase-locked loop (PPLL) with frequency adjustable ratio divider (FARD) in a feedback circuit in which modulating signal goes into the voltage-controlled oscillator (VCO) inlet [N. M. Tikhomirov, S. K. Romanov, A. V. Lenshin FM signal shaping in adjustable synthesizers, M.: Radio and communication, 4004. - p. 210.].
  • VCO voltage-controlled oscillator
  • the FARD ring perceives VCO frequency modulation at its modulation inlet as internal disturbance which is compensated downward at the feedback circuit. This compensation occurs at a pass band of the FARD ring and is defined by a low-pass filter (LPF) of the VCO control circuit, i. e. at low frequencies.
  • LPF low-pass filter
  • the pass band of the FARD ring should be constricted for modulation frequency extension to low frequencies, i. e. it is necessary to make LPF more inertial at the frequency-phase detector (FPD) outlet that cause FS performance and noise immunity decrease.
  • bandwidth of the ring for speech signal below a telephone line band (300...3400 Hz) with automatic system control is desirable for FS operating on the FARD basis in the FM mode.
  • some modem FM communication system requires lower modulation frequency limit to be close to zero (constant) dimension. This is usually required for communication systems in which modulation signal impulse sequence with long duration of individual impulses (individual“ones” and “zeros”) is used for the impulse top, defined by very low modulation frequencies, does not have major“roll-off’, otherwise the information while message radio reception is highly damaged.
  • CMX7143 modem two-point modulation frequency synthesizer rhttp://ip.datasheethome.com/pdf7CMX7143.htmll is most similar to the proposed one for wireless data transmission in the SDR applications, in which the modulation signal is input concurrently in the modulation VCO and RCO inlets, i. e. in two scheme points.
  • Fig. 1 The prototype-device flowchart is given in Fig. 1 with following designations: 1 - two-point modulation signal source modem (MSSM);
  • MSSM modulation signal source modem
  • LPF low-pass filter
  • FARD frequency adjustable ratio divider
  • VCO voltage-controlled oscillator
  • IMC integrated microcircuit
  • the prototype-device has series connected two-point modulation signal source modem 1, RCO 2, FDRD 3, FPD 4, LPF 5, VCO 7, the second individual modulation VCO 7 inlet is connected to the first MODI MSSM1 outlet.
  • the second MOD2 MS SMI outlet is connected to the individual modulation RCO 2 inlet.
  • the VCO 7 outlet is connected to the FARD 6 inlet, the outlet of which is connected to the second FPD 4 inlet.
  • the prototype- device flowchart has integrated microcircuit 8 of SKY72300 type of the SkyworksSolutions company, in which FDRD 3, FPD 4 and FARD 6 are combined. It should be pointed out that the external VCO 7 with individual modulation inlet is used in the prototype-device.
  • the two-point frequency modulation synthesizer FARD ring is formed on the basis of these units and blocks.
  • the prototype-device operates as follows. Modulation signal in the MSSM 1 modem is split into 2 channels of MODI and MOD2 modulation with two modulation input points: into the VCO 7 modulation inlet and RCO 2 modulation inlet. Inside the MSSM 1 on the two channels there are digital-to- analogue converters (DAC) which form level-required signals at the MODI and MOD2 outlets.
  • DAC digital-to- analogue converters
  • the MODI outlet carries modulation signal at a band which is of upper cut-off frequency of the FARD ring and the FARD ring outlet carries modulation signal at a band which is of lower cut-off frequency of the FARD ring. This ensures flat FMR irrespective of the FARD ring cutoff frequency dimension by low-frequency and upper-frequency FMR stitching at the MODI and MOD2 channels over the cut-off frequency.
  • this two-point frequency modulation circuit realization has several disadvantages:
  • pair wise programmable gain control on the two MODI and MOD2 modulation channels is required due to nonlinearity dispersion of the RCO 2 and VCO 7 modulation response.
  • the goal of the invention is modulation frequency-band extension in the low frequencies range while simplifying of the device.
  • a predistortion device (PDD) the inlet of which is connected to the first modem outlet and the outlet is connected to the second LPF inlet is inserted in the frequency modulated frequency synthesizer which has the series connected RCO, FDRD, FPD, LPF and VCO the outlet of which is connected to the second FARD inlet, the outlet of which is connected to the second FPD inlet.
  • MSSM two-point modulation signal source modem
  • RCO reference crystal oscillator
  • FDRD frequency defined ratio divider
  • the proposed device has the series connected RCO 2, FDRD 3, FPD 4, LPF 5, VCO 7.
  • the VCO 7 outlet is connected to the FARD 6 inlet, the outlet of which is connected to the second FPD 4 inlet.
  • the first MS SMI outlet is connected to the PDD 9 inlet the outlet of which is connected to the second LPF inlet.
  • the proposed device flowchart has, for example, LMX2592 type IMC of the Texaslnstruments company in which FDRD 3, FPD 4, FARD 6 and VCO 7 are combined.
  • the one-point frequency modulation synthesizer FARD ring is formed on the basis of these units and blocks.
  • integrated VCO 7 is used, in IMC 8 and RCO without individual modulation inlets. Consequently, the one point frequency modulation synthesizer FARD ring is formed on the basis of these units and blocks.
  • the MODI outlet modulation signal of the MSSM 1 modem through PDD 9 is carried to one point of control and conjugation circuit of the external LPF 5 with VCO 7 inserted into IMC 8.
  • Fig. 3 shows detailed PDD 9 realization scheme, as a part of the FM synthesizer with FARD including two identical LPF 5 and additional RC- circuits.
  • the proposed device shown in Fig.2 with PDD 9 opening operates as follows. Modulation signal frequency range may be reduced to the frequency lower than FARD ring pass bandwidth as PDD 9 scheme compensates FARD ring amount of feedback by connecting the second LPF 5 to it and consequently, noise cancellation and high frequency modulation signal details in FPD 4. Therefore, the second LPF 5 effect impairs modulation FMR at high-frequencies. Consequently, this interaction should be compensated by a chain of two resisters having identical R i resistance and Cu and C 1.2 capacitors.
  • Capacitance value of the Cu and C 1.2 of the capacitors are defined by mean value of the VCO 7 control curve steepness and required value of deviation of FM outlet signal.
  • Resistor R and capacitor C are included for LPF 5 load compensation in the VCO 7 control circuit.
  • Capacitor C also is required for voltage leak protection of direct current at VCO 7 and PDD 9 outlet.
  • the third-order LPF 5 is selected for sufficient noise dumping with comparison frequency in FPD 4.
  • Resistor R 4 combined with strays at VCO inlet may augment the LPF 5 course.
  • Resistor R 4 is installed to obtain minor effect on LPF 5 to prevent strays direct load at VCO 7 outlet on the value of capacitor C3.
  • the MODI modulation signal at the PDD 9 block outlet falls and is transmitted to the VCO 7 with frequency-response distortions.
  • the PDD 9 in FS with FARD made under the scheme above with FM inserted allows to extend down significantly the modulating frequency band. At the same time schematic solutions and cheap details are used in the PDD 9. Cheap and practical FS FM scheme with FARD with flat FMR on the basis of feedback compensation is proposed. PDD detail calculation method is simple and covers not only FMR definition but also the maximum deviation.
  • Invention based frequency synthesizer can be used in professional radio stations that use frequency modulation (manipulation) as an exciter in signal formation. For example, digital mobile radio stations using 4-phase-shift keying [1].
  • the frequency- modulated signal is inputted simultaneously to the VCO and OQG.
  • VCO is made of discrete elements and modulation of the OQG is carried out through a separate modulation input designed for frequency modulation of the OQG by an external modulation signal.
  • a separate modulation input designed for frequency modulation of the OQG by an external modulation signal.
  • ETSI TS 102 361-1 V2.4.1 Electromagnetic compatibility and radio frequency spectrum (ERM) of digital mobile radio (DMR) Part 1 : DMR radio interface protocol.

Abstract

The invention relates to radio engineering and may be used as a frequency modulated radio transmitter exciter and receiver heterodyne without modulating signalling. Technical result - obtaining the frequency-modulated signal with practically frequency unrestricted from above modulation band. Frequency modulated frequency synthesizer with the series connected reference crystal oscillator, frequency fixed ratio divider, frequency-phase detector, low-pass filter, voltage-controlled oscillator, the outlet of which is connected to the frequency adjustable ratio divider inlet, the outlet of which is connected to the second frequency-phase detector inlet.

Description

i
FREQUENCY MODULATED FREQUENCY SYNTHESIZER IN
SDR APPLICATIONS
Branch of technology
The invention relates to radio engineering and may be used as a frequency modulated radio transmitter exciter and receiver heterodyne without modulating signalling.
Background of invention
Frequency modulated (FM) frequency synthesizer (FS), made on a basis of the pulse-phase-locked loop (PPLL) with frequency adjustable ratio divider (FARD) in a feedback circuit in which modulating signal goes into the voltage-controlled oscillator (VCO) inlet [N. M. Tikhomirov, S. K. Romanov, A. V. Lenshin FM signal shaping in adjustable synthesizers, M.: Radio and communication, 4004. - p. 210.]. In this FS frequency-modulated signal with practically frequency unrestricted from above modulation band may be obtained at the outlet.
Its disadvantage is modulating frequency range limitation from below due to feedback action of the FARD ring. The FARD ring perceives VCO frequency modulation at its modulation inlet as internal disturbance which is compensated downward at the feedback circuit. This compensation occurs at a pass band of the FARD ring and is defined by a low-pass filter (LPF) of the VCO control circuit, i. e. at low frequencies. The pass band of the FARD ring should be constricted for modulation frequency extension to low frequencies, i. e. it is necessary to make LPF more inertial at the frequency-phase detector (FPD) outlet that cause FS performance and noise immunity decrease. While FS modulation at a reference channel with modulation signal for individual modulation inlet of a reference crystal oscillator (RCO), this signal is an external disturbance for the FARD system. Meanwhile the synthesizer FARD system performs as an equivalent LPF, over modulating action, i. e. roll-off of FS frequency modulation response (FMR) at high frequencies occurs. The pass band of the FARD system should be extended towards high frequencies to decrease the FMR distortion. However, the noise filtering is very much down in the output spectrum with comparison frequency and its harmonic.
One way to obtain steady FMR maintaining the synthesizer high speed of operation at relative simplicity of the circuit realization is simultaneous frequency modulation in VCO and RCO. Circuit realization of this way is given in the useful model patent No. 29628, 20.12.2002. "Frequency modulated digital frequency synthesizer" which may be considered as an analogue. Analogue disadvantage is modulation frequency extension impossibility in low frequencies while maintaining dynamic property of the FARD system and to obtain steady FMR in a wide modulation frequencies band. The reason is that the modulation band in low modulating frequency is restricted by the pass band of LPF of the VCO control circuit which cannot be very narrow due to possibility of unstable FS operating and its very slow acquisition. In practice, bandwidth of the ring for speech signal below a telephone line band (300...3400 Hz) with automatic system control is desirable for FS operating on the FARD basis in the FM mode. At the same time, some modem FM communication system requires lower modulation frequency limit to be close to zero (constant) dimension. This is usually required for communication systems in which modulation signal impulse sequence with long duration of individual impulses (individual“ones” and “zeros”) is used for the impulse top, defined by very low modulation frequencies, does not have major“roll-off’, otherwise the information while message radio reception is highly damaged.
Technically, a CMX7143 modem two-point modulation frequency synthesizer rhttp://ip.datasheethome.com/pdf7CMX7143.htmll is most similar to the proposed one for wireless data transmission in the SDR applications, in which the modulation signal is input concurrently in the modulation VCO and RCO inlets, i. e. in two scheme points.
The prototype-device flowchart is given in Fig. 1 with following designations: 1 - two-point modulation signal source modem (MSSM);
2 - reference crystal oscillator (RCO) with separate modulation inlet;
3 - frequency defined ratio divider (FDRD);
4 - frequency-phase detector (FPD);
5 - low-pass filter (LPF); 6 - frequency adjustable ratio divider (FARD);
7 - voltage-controlled oscillator (VCO) with separate modulation inlet;
8 - integrated microcircuit (IMC).
The prototype-device has series connected two-point modulation signal source modem 1, RCO 2, FDRD 3, FPD 4, LPF 5, VCO 7, the second individual modulation VCO 7 inlet is connected to the first MODI MSSM1 outlet. The second MOD2 MS SMI outlet is connected to the individual modulation RCO 2 inlet. The VCO 7 outlet is connected to the FARD 6 inlet, the outlet of which is connected to the second FPD 4 inlet. The prototype- device flowchart has integrated microcircuit 8 of SKY72300 type of the SkyworksSolutions company, in which FDRD 3, FPD 4 and FARD 6 are combined. It should be pointed out that the external VCO 7 with individual modulation inlet is used in the prototype-device. Thus, the two-point frequency modulation synthesizer FARD ring is formed on the basis of these units and blocks.
The prototype-device operates as follows. Modulation signal in the MSSM 1 modem is split into 2 channels of MODI and MOD2 modulation with two modulation input points: into the VCO 7 modulation inlet and RCO 2 modulation inlet. Inside the MSSM 1 on the two channels there are digital-to- analogue converters (DAC) which form level-required signals at the MODI and MOD2 outlets. The MODI outlet carries modulation signal at a band which is of upper cut-off frequency of the FARD ring and the FARD ring outlet carries modulation signal at a band which is of lower cut-off frequency of the FARD ring. This ensures flat FMR irrespective of the FARD ring cutoff frequency dimension by low-frequency and upper-frequency FMR stitching at the MODI and MOD2 channels over the cut-off frequency. However, this two-point frequency modulation circuit realization has several disadvantages:
- RCO with separate modulation inlet which reduces loaded RCO 2 generator oscillative circuit quality should be used in the scheme. This impairs frequency stability which augments phase noise. In its turn, these circumstances significantly and in the worst way affect the FS output signal as a whole.
- due to the change of the input-to-output frequency ratio of the feedback circuit at output frequency changing, the non-linearity of the RCO 2 and VCO 7 modulation response on the two MODI and MOD2 modulation channels the amplification of the modulating signals should be corrected to ensure FMR uniformity. - in the two-point frequency modulation scheme a newly developed unique or serial expensive RCO 2 and VCO 7 generators which have individual modulation inlets. Output of the latter is quite limited.
- technologically, pair wise programmable gain control on the two MODI and MOD2 modulation channels is required due to nonlinearity dispersion of the RCO 2 and VCO 7 modulation response.
Invention disclosure
The goal of the invention is modulation frequency-band extension in the low frequencies range while simplifying of the device. A predistortion device (PDD), the inlet of which is connected to the first modem outlet and the outlet is connected to the second LPF inlet is inserted in the frequency modulated frequency synthesizer which has the series connected RCO, FDRD, FPD, LPF and VCO the outlet of which is connected to the second FARD inlet, the outlet of which is connected to the second FPD inlet. This makes a new simple scheme of the one-point frequency modulation based on the amount of feedback compensation of the FARD system by linear predistortion insertion PDD of the modulating signal to compensate the FARD ring operating as a high-pass filter over the modulating signal of MODI modulation channel only at the main control VCO inlet at one control and conjugation circuit point but not at a separate modulation inlet.
Brief description of the drawing
The prototype-device flowchart is given in Fig. 2 with following designations:
1 - two-point modulation signal source modem (MSSM); 2 - reference crystal oscillator (RCO) without separate modulation inlet; 3 - frequency defined ratio divider (FDRD);
4 - frequency-phase detector (FPD);
5 - low-pass filter (LPF);
6 - frequency adjustable ratio divider (FARD); 7 - voltage-controlled oscillator (VCO) without separate modulation inlet;
8 - integrated microcircuit;
9 - predistortion device (PDD).
The proposed device has the series connected RCO 2, FDRD 3, FPD 4, LPF 5, VCO 7. The VCO 7 outlet is connected to the FARD 6 inlet, the outlet of which is connected to the second FPD 4 inlet. The first MS SMI outlet is connected to the PDD 9 inlet the outlet of which is connected to the second LPF inlet.
The proposed device flowchart has, for example, LMX2592 type IMC of the Texaslnstruments company in which FDRD 3, FPD 4, FARD 6 and VCO 7 are combined. Thus, the one-point frequency modulation synthesizer FARD ring is formed on the basis of these units and blocks. Besides, integrated VCO 7 is used, in IMC 8 and RCO without individual modulation inlets. Consequently, the one point frequency modulation synthesizer FARD ring is formed on the basis of these units and blocks. The MODI outlet modulation signal of the MSSM 1 modem through PDD 9 is carried to one point of control and conjugation circuit of the external LPF 5 with VCO 7 inserted into IMC 8.
Fig. 3 shows detailed PDD 9 realization scheme, as a part of the FM synthesizer with FARD including two identical LPF 5 and additional RC- circuits. The proposed device shown in Fig.2 with PDD 9 opening operates as follows. Modulation signal frequency range may be reduced to the frequency lower than FARD ring pass bandwidth as PDD 9 scheme compensates FARD ring amount of feedback by connecting the second LPF 5 to it and consequently, noise cancellation and high frequency modulation signal details in FPD 4. Therefore, the second LPF 5 effect impairs modulation FMR at high-frequencies. Consequently, this interaction should be compensated by a chain of two resisters having identical R i resistance and Cu and C1.2 capacitors. Resistance value of the R 1 resister is defined by the ratio R, =10/pίM L ώ (C +C2 ) , where f <wnin is the minimum MODI modulation signal frequency. Capacitance value of the Cu and C1.2 of the capacitors are defined by mean value of the VCO 7 control curve steepness and required value of deviation of FM outlet signal. Resistor R and capacitor C are included for LPF 5 load compensation in the VCO 7 control circuit. Capacitor C also is required for voltage leak protection of direct current at VCO 7 and PDD 9 outlet. The third-order LPF 5 is selected for sufficient noise dumping with comparison frequency in FPD 4. Resistor R 4 combined with strays at VCO inlet may augment the LPF 5 course. Resistor R 4 is installed to obtain minor effect on LPF 5 to prevent strays direct load at VCO 7 outlet on the value of capacitor C3.
The MODI modulation signal at the PDD 9 block outlet falls and is transmitted to the VCO 7 with frequency-response distortions. The scheme shown on the Fig.3 was designed and adjusted for voice messaging at flat FMR to obtain optimal R resistance and C capacitance value from many different possible variants. Best specification is achieved at C=680nF and R=33kOm. The PDD 9 in FS with FARD, made under the scheme above with FM inserted allows to extend down significantly the modulating frequency band. At the same time schematic solutions and cheap details are used in the PDD 9. Cheap and practical FS FM scheme with FARD with flat FMR on the basis of feedback compensation is proposed. PDD detail calculation method is simple and covers not only FMR definition but also the maximum deviation.
Thus, in the proposed frequency modulated frequency synthesizer it is possible to extend significantly modulation frequency band in low frequencies range (in the limiting case approaching zero frequency) and to obtain steady FMR in the wide modulation frequencies band with minimum distortion to the output spectrum high frequency. At the same time it is possible to refuse two-point modulation method requiring precision amplification lining by DAC at the two modulation channels.
Industrial applicability
Invention based frequency synthesizer can be used in professional radio stations that use frequency modulation (manipulation) as an exciter in signal formation. For example, digital mobile radio stations using 4-phase-shift keying [1].
In the radio stations of the Hytera family [http://hytera.ru], the frequency- modulated signal is inputted simultaneously to the VCO and OQG. VCO is made of discrete elements and modulation of the OQG is carried out through a separate modulation input designed for frequency modulation of the OQG by an external modulation signal. As noted above, such scheme allows to obtain a uniform frequency response of the frequency synthesizer, but in practice it leads to deterioration of OQG parameters, such as signal stability and spectral characteristics in the near zone, because OQG must ensure the passage of the modulating signal with a deviation of 2 - 3 kHz [1] due to its own instability. At the same time, when working on the reception, in the absence of a modulating signal connected to the modem control input OQG can degrade the signal spectrum due to induced intra-system interference of the radio station. Implementation of the FM MF, according to the claimed invention, will allow to avoid the noted drawbacks due to the use of a highly stable OQG without a broadband input for the modulating signal. At the same time, the proposed scheme with the DTD allows the use of commercially produced VCO without a separate modulation input, and PPLL chips with integrated VCO, e.g., LMX2571 Texas Instruments, ADF4355 Analog Devices.
At industrial application, it will allow to reduce significantly the cost of radio design due to reduction of expenses for component elements and adjustment at improvement of MF spectral characteristics.
Sources of information
1. ETSI TS 102 361-1 V2.4.1 (2016-02) Electromagnetic compatibility and radio frequency spectrum (ERM) of digital mobile radio (DMR) Part 1 : DMR radio interface protocol.
2. Tikhomirov N.M., Zarodin S.G., Rakhmanin D.N., Tikhomirov M.N. Perspective method of the broadband frequency modulation in the synthesizers with phase-locked loop / Modem radio electronics retrospective, V.A. Kotelnikova // International scientific conference: Program and abstracts. - M.: MEI publishing house, 2003. - p. 54-55.
3. Tikhomirov N.M., Zarodin S.G., Eroshin A. V, Tikhomirov M.N. FM signal formation in the pathogens with low inertia of frequency tuning // Proceedings of the 58th Scientific session devoted to the Radio day. - Volume 2. - 2003. - p. 45-47.
4. Tikhomirov N.M., Romanov S.K., Lenshin A. V. Formation of FM signals in auto-tuned synthesizers, M.: Radio and communication, 2004. - 210
P·
5. Pestriakov A. V, Kolesnikov 1.1. Investigation of the FM stereo signal generator based on delta-sigma synthesizers // Electrical communication. - 2005. - No. 6. - P. 29-32.

Claims

CLAIM
1. Frequency modulated frequency synthesizer with the series connected reference crystal oscillator, frequency fixed ratio divider, frequency-phase detector, low-pass filter, voltage-controlled oscillator, the outlet of which is connected to the frequency adjustable ratio divider inlet, the outlet of which is connected to the second frequency-phase detector inlet, that differs by the inserted predistortion device, the inlet of which is connected to the first modem outlet and the predistortion device outlet is connected to the second low-pass filter inlet.
2. According to the par. 1 frequency synthesizer which differs by predistortion device has a differentiating circuit of two resistors, two capacitors and the low-pass filter.
PCT/RU2019/000404 2018-08-09 2019-06-05 Frequency modulated frequency synthesizer in sdr applications WO2020032821A1 (en)

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RU2018129170A RU2688243C1 (en) 2018-08-09 2018-08-09 Frequencies synthesizer with frequency modulation in sdr applications
RU2018129170 2018-08-09

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU8190U1 (en) * 1997-11-12 1998-10-16 Сергей Анатольевич Шерстюков DIGITAL FREQUENCY SYNTHESIS WITH FREQUENCY MODULATION
RU55517U1 (en) * 2006-02-28 2006-08-10 Открытое акционерное общество "Концерн "Созвездие" FREQUENCY SYNTHESIS WITH FREQUENCY TELEGRAPHY MODE
WO2016203460A2 (en) * 2015-06-18 2016-12-22 Yekutiel Josefsberg Ultra low phase noise frequency synthesizer
WO2018090686A1 (en) * 2016-11-17 2018-05-24 深圳市华讯方舟卫星通信有限公司 Frequency synthesizer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU29628U1 (en) * 2002-12-20 2003-05-20 Бокова Оксана Игоревна Frequency Modulated Digital Synthesizer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU8190U1 (en) * 1997-11-12 1998-10-16 Сергей Анатольевич Шерстюков DIGITAL FREQUENCY SYNTHESIS WITH FREQUENCY MODULATION
RU55517U1 (en) * 2006-02-28 2006-08-10 Открытое акционерное общество "Концерн "Созвездие" FREQUENCY SYNTHESIS WITH FREQUENCY TELEGRAPHY MODE
WO2016203460A2 (en) * 2015-06-18 2016-12-22 Yekutiel Josefsberg Ultra low phase noise frequency synthesizer
WO2018090686A1 (en) * 2016-11-17 2018-05-24 深圳市华讯方舟卫星通信有限公司 Frequency synthesizer

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