SU1109858A1 - Frequency divider - Google Patents

Abstract

A FREQUENCY DIVIDER containing a series-connected first modulator, a first band-pass filter, a first frequency dividing unit, a second modulator, a second band-pass filter, and a second frequency dividing unit, characterized in that, in order to expand the range of dividing coefficients, connected additional frequency division channels, each of which consists of a serially connected modulator, band-pass filter and frequency division unit, the modulator input of the first additional division channel the frequency of connection to the output of the second frequency dividing unit, the output of the frequency dividing unit VC of the auxiliary dividing channel is connected to the first input of the first modulator, while the outputs of the corresponding newly introduced (to + 2) input frequency dividers The inputs of which are combined and are (L input frequency divider.

Description

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x The invention relates to radio engineering and can be used in coherent frequency grids 8 radio receivers and radio transmitters (their devices. The frequency divider is known, which contains a series-connected balanced modulator, low-pass filter, amplifier, and one or more frequency dividers by two, the output of the latter of which is connected to the second input of the balanced modulator 11. The disadvantage of the divider is that the series-connected frequency dividers only use two in the chain, which limits The set of possible division factors is the closest to the technical aspect of the present invention, a frequency divider comprising a first modulator, a first bandpass filter, a first frequency division unit, a second modulator, a second bandpass filter, and a second frequency division block t 21, which are connected in series. However, the known frequency divider has a limited set of division factors The aim of the invention is to expand the range of division factors. The goal is to achieve the fact that the frequency divider, the second modulator, the second band pass filter, and the second frequency division block are entered in the frequency divider, the first band-pass filter, the first frequency division unit, the second modulator, each of which consists of series-connected modulator, band-pass filter and frequency division unit, the modulator input of the first additional frequency division channel is connected to the output of the second division unit frequency, the output of the frequency block of the kth additional frequency division channel is connected to the first input of the first modulator, while the inputs of the corresponding newly entered (to + 2) input frequency dividers, the inputs of which are connected to the second inputs of each of the modulators are combined and are the input of the frequency divider. The drawing shows a structural electrical circuit of a frequency divider. The divider contains (k + 2) shshshih frequency dividers 1, the first modulator 2, the first band-pass filter 3, the nepBbii frequency division unit, the second modulator 5, the second band-pass filter 6, the second block 7 frequency divisions; To additional frequency division channels 8; each of which consists of a modulator 9, a band-pass filter 10 and a frequency division block 1 1. The divider works as follows. The first input of the first modulator 2 receives the input signal of the frequency rf, t |, where, is the division factor of the first input divider 1 frequency. To the second input of the first mode, L o tor 2, a signal is output from the unit 11 for dividing the K-th additional channel 8 for dividing frequency. Each of blocks 4, 7 and 11 of the division contains a chain of simple frequency dividers made in the form of a harmonic divider, for example an auto-oscillator operating in hard synchronization from the output of the corresponding band-pass filter 3, 6 and 10 tuned to the difference or total frequency of the input signal h / wij / and the output signal of the preceding block 4, 7 and 11 divisions. For the tc-ro of the additional division channel 8, the input frequency fic-A biu, fiiL-g ewv 1 / where the total division factor of the division unit 11 (K-1) of the additional channel 8 frequency division. Thus, the signals of sufficient amplitude and close in frequency, which are necessary for capturing and synchronizing the first dividing unit 4, connected after the first bandpass filter 3, tuned to the equal or total frequency of the signals, arrive at the two inputs of the first modulator 2. Speech c is fueuv.lm. Therefore, after modulator 2, additional amplification is practically not required to compensate for conversion losses in modulator 2. The first dividing unit 4 contains a chain of simple frequency dividers by two, by three and by five in the required quantitative combination for obtain the division coefficient v. v. The output of the first subdivision block 4 to the second input of the second modulator 5, the first input of which is connected to the device input through the frequency divider 1 with the division factor Difference or sum signal from the output of the modulator 5, which is equal to the input of the second block 7 -de through the band-pass filter 6. The second division block 7 carries out the division of the difference or total frequency by Hj times. Next, the output of the second dividing unit 7 is connected to the second input of the modulator 9 of the first additional dividing channel, etc. Since all inputs of modulators 2, 5, and 9 are given signals when the input frequency F is applied, such a closed loop system with feedback from the output to the input of the first modulator begins to work, all dividers enter the capture and synchronism. Only in this case is the balance of frequencies available throughout the device. The outputs of the frequency divider are the outputs of each of blocks 4, 7, and 11 divisions. In general terms, the possible division ratio is expressed by the formula. | “D f4” de K is the number of channels, Depemip, COE (| K1 ICCIIT (11 I c. H, 11 × 1 h dividers 1 of the frequency G – 1 h of the channel, W - dalsng block ratio of 4, 7 and 11 divisions. Indices at 4)) .) x m and n p Formula take the value pi-d p., iflmg-p 0; ecAmt-p40, "- {tiu, ifltsv.34k; if i k-, C-Ci 4 j + «t fc,. I in-to, if:,, 1,2, ..., K-2. Since the oscillators operating in hard synchronization mode are used as simple frequency dividers in blocks 4, 7, and 11, synchronization points are multiples of the period of the divisible frequency Fex. Therefore, the phase assignment of the output signals fWf, is also a multiple of some sampling of the period of the input signal of the dividend frequency 360g bud. At these points, the phase of the output signals is coherently tied to the phase of the input signal, and these points are steady in the steady state. The proposed frequency divider makes it possible to obtain any desired division factor and, moreover, at the same time several other division factors, i.e. a coherent frequency grid is simultaneously created.

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Claims (1)

A frequency divider comprising serially connected first modulator, first bandpass filter, first frequency division unit, second modulator, second bandpass filter and second frequency division unit, which, in order to expand the range of division coefficients, it introduces to the series-connected additional channels of frequency division, each of which consists of a series-connected modulator, a bandpass filter and a frequency division unit, the modulator input of the first additional channel of division the connection frequency to the output of the second frequency division unit, the output of the frequency division unit to the nth additional channel of frequency division is connected to the first input of the first modulator, while the outputs of the corresponding newly introduced (to + 2) input frequency dividers are connected to the second inputs of each modulator - § which are combined and are the input of the frequency divider. > 1 1109858 2