SU571912A1 - Program-controlled frequency divider - Google Patents

Description

(54) FREQUENCY DIVIDER WITH SOFTWARE CONTROL

The invention relates to a digital computation technique and can be used in frequency synthesizers, in automatic control and monitoring systems. A known programmed frequency divider comprising a program block, a generator, a counter, a register, controllable gates, a match element and a switch l. However, this device is quite difficult. The closest to the proposed device is a device containing a pulse generator, a software unit whose outputs are connected to the installation inputs of the 2J counting device. However, such a frequency divider does not have flexibility in control, in particular, it does not allow adjusting the output frequency without changing the program in the program block. The purpose of the invention is to expand the functional capabilities of the device. For this purpose, additional timers, a division factor adjuster, a frequency divider, switches, a key and an OR element are introduced into a programmed frequency divider with a programmed control containing the HeaterOgr pulses, a program block whose outputs are connected to the set points of the scaler. Moreover, the outputs of the set factor of the division factor are connected to the setup inputs of two additional counting devices, the output of the first of which is connected to the input of the nej switch, and the potential output of the second switch to the control input of the first switch, the first output of which is connected with the control input of the second switch, the input of which is connected to the output of the pulse generator, the first output with the counting input of the third additional scaler, and the second output d - with the key input and with the counting input of the counting device, the output of which is connected to the first corner of the key and with the counting input of the first additional counting device. At the same time, the installation input of the third additional recalculation device is based on the Delitol hour-time with the output of klk cha, and “with the snap-in input of the second additional perestoyny device for, output of which is through the OR item: L1ochen KS to the second direction of the qlm inputs. cha and the second crossing

In the drawing, a structural electrical circuit / e. proposed device

Divider contains generator 1, program. m block 2. overlap 3 heal rate coefficients: recalculating devices 4, 5 c in with parallel input of recalculation coefficient, recalculation device 7 s after consecutive time of water / conversion factor 8, frequency healer 8, decade switch of pvgelk 9, It ) 11, controlled element OR 12.

Each recalculation device with a parallel input of the recalculation of the recalculation into its own line C ;;, CK1G 5: Yugistr 13, counter 14, Elme 15 comparison, switch 16., Difference of the measuring device

7c, the sequence of inputting the conversion factor from the device with parallel input is that instead of register 13 a counter 17 of pulses 1 of the factor of recalculation is inserted into it. .

The main frequency division factor. Zynoskgs from program block 2 to the counting device 4. Additional coefficient. The MacjYJTbf fktspent dki comes from the ESS of CSNI In .a depeni to the recalculated j-structures 5, 6, prkchem in the per-counting device 5 aanosyts the code of the integer part, and fi is the most convenient pack .- ;; ,

The &: tg; o works as follows.

Il. Tschi; GeneralPre 2 comes through the switch 9 i-a to the second input of the counting device 4 (the input of the switch 10 / and the subwoofer with the counter 14. At the same time, THESE bdes through 1 switch 11 to the divider 8. From the divider

The frequency of the generator 1, reduced ten times, is fed to the set input of the counting device 7 (counting counter input) 17.

After TorOj jcaj; the count 14 of the recalculated device 4 drops M-1 pulse,

where N is the conversion factor specified by program 2, block 15, element 15 compare PIA switches switch 16, and the next and rlIylc generator 1 will go to the output of the drive to reset the counter 14. This impulse will close the key 11. As a result, the number in the counter 17 of the enumeration is 3 and 7. There will be recorded a number corresponding to w.E.W. to the number of one-tenths of the first generation of the output frequency

the counting device 4, and the counter 14 of the counting device 5 will change its state by one. At this point, the frequency division cycle with division factor N ends. The number of such cycles is determined by the integer part M of the additional division factor recorded in the remainder 5 of the set 3 division factor.

At the end of all conversion cycles determined by the coefficient M, a pulse is output at the output of counting device 5, which, if there is a fractional part K of the division factor recorded in the recalculation device 6, goes through switch 1O to the control input of the switch 9 and switches the output of the generator 1 to the input of the counting device 7. The period of the pulses at the output of the counting device 7 will be equal to the tenth fraction of the frequency period of the convertible device 4.

The output pulses of the scaling device 7 are calculated by the recloser 6 to the set value K of the fractional part of the additional division factor, after which Ra its output is a pulse arriving through element 12 at the output of the frequency divider. The same impulse will return the switch 9 and the key 11 to the initial state, after which the operation of the device is repeated.

In the absence of a fractional part K, in addition to the dividing ratio, the outgoing pulses of the counting device 5 through the switch 10 and the element 12 arrive directly at the output of the divider.

The installation of the divider 8 and O produces with software block 2 when changing the code in the conversion device 4, which allows to reduce the error in the length of the period of the output pulses resulting from the remainder of t division.

If N is the main division factor, specified by program block 2, and M and K are respectively intact and fractional parts of an additional division factor, specified by unit 3, and N 1,2 ..., M 1,2 ..., and To 0,1,2 ..., then the period of following pulses at the output of the frequency divider will be as follows

TO

() -,

EX and 10

where Get is the period of the pulse of the generator 1 of the reference frequency.

Claims (2)

The frequency divider may have a fractional division factor not only to the tenth, but also to hundredths, etc. share. For this, d & The cadre divider must contain not one, but as many decades, as many bits need to have after the comma, and the coefficient of the tomb part must be expressed in units of mlag. This is The use of a divider, for example, in an automatic control device with a frequency output, will allow to obtain a more linear control characteristic due to the uniformity of the output frequency period, and the use of a divider in frequency synthesizers will provide a wider operating range at the same code width coming from software block. Invention A frequency divider with software control, containing a generator and switches, a program block whose outputs are connected to the installation inputs of the counting device, characterized in that, in order to expand the functionality, additional scaling devices are introduced into it, the division factor adjuster, the divider frequencies, switches, a key and an OR element, and the outputs of the dividing ratio setting clock are connected to the installation inputs of two additional counters, the first of which otorrhea connected to an input of the first ne} eklyuchatelYa; and the potential output of the second - to Ex. It is necessary for the client to enter the first switch, the first input of which is connected to the first input of the OR element, the second output to the first control kmg. input of the second switch, the input of which is connected to the output of the pulse generator, the first output to the counting input of the third additional counters, and the second output - with a key input and with a counting input scaling device, the output of which is connected i. The first control is the key input and with the counting input of the first additional scaling device, while setting the input of the third additional scaling device via the frequency divider with the key output, and the output with the counting input of the second additional converter, whose output through the element OR through the second control of the key and second switch inputs. Sources of information taken into account in the examination: 1, USSR Copyright Certificate Co 442576, cl, H 03 K 23/24, 1972. 2. USSR Author's Certificate No. 372709, class, H 03 K 25/04, 1971.