SU1068836A1 - Digital phase meter - Google Patents

Abstract

A DIGITAL PHASOMETER containing drivers, the inputs of which are connected to the input terminals of a phase meter, a quantizing impulse generator, a counter and a frequency divider, characterized in that, in order to improve performance and expand the working frequency digittaon, the first and second frequency multipliers, a reversive counter and trigger, with the input of the first driver connected to the trigger input of the trigger, the reset input of the reversible counter and the reset input of the counter, the output of the second driver connected to the reset input of the trigger and the input of the reversible counter installation, the forward trigger output is connected to the reversible counter count control direction input, the reversible counter transfer output is connected to the counter counter, the outputs of which are connected to the control inputs of the frequency divider, and the reverse counter outputs are connected to the control inputs of the frequency multipliers , the counting input of the first frequency multiplier is connected to the output of the frequency divider, and the output of the first frequency multiplier is connected to the counting input of the second frequency multiplier §, connecting output with the input of the subtraction unit of the reversible f counter, the output of the quantizing pulse generator is connected to the input of the splitter, frequency, and the input of the addition of the reversible counter unit.J

Description

Have

The invention relates to a measurement technique and can be used in devices for measuring, recording and monitoring the phase shift between electrical signals, in control systems and automatic frequency control.

Known digital phase meter containing forming devices connected to the trigger inputs, the output of which is through a normalizing device and a filter connected to the input of a digital voltmeter. The device is distinguished by its relative simplicity.

The drawbacks of the device are low operation and relatively low accuracy due to the presence of a filter and other analog elements.

The closest to the invention to the technical nature is a digital phase meter comprising a quantizing pulse generator, the first and second forming units, the first, second and third electronic switches, the first and second elements AND, the frequency divider, the first and second elements OR, the first and second the blocks of elements I, the first, second, third and fourth counters and the control unit, with the inputs of the forming units connected to the input terminals of the device, the output of the first forming unit connected to the inputs of the first and second keys, the output The second forming unit - with the second input of the second key, the output of the control unit with the control inputs of the first, second and third keys, as well as with the first input of the second element And, the output of the first key connected to the first input of the first element And, the second input of which is connected to the first the output of the generator of quantizing pulses, the output of the second key is connected to the first input of the second element I, the second input of the last - to the second you:; ohm generator of the quantizing pulses, the output of the second element I is connected to the input of the second counter, the third in The output of the generator of quantizing pulses with the first input of the third key, whose output is connected to the input of the third counter, the outputs of the last are connected to the inputs of the first and second blocks of the And elements, and the second inputs of the first block of And elements - to the outputs of the first counter, whose input is connected to the outputs of the first element And, the second inputs of the second block of elements And connected to the outputs of the second counter, the outputs of the first block of elements And - with the inputs of the first element OR, the output of the latter through a frequency divider connected to the second input of the third o key, the outputs of the second block of elements And - with inputs of the second

NLI element, the output of which is connected to the input of the fourth counter L21.

The disadvantages of the known device lie in its relatively slow speed due to the fact that the measurement and conversion processes of the measurement result are separated in an insufficiently wide range of operating frequencies Cell fmokf. BEFORE ,

2 where - the number of bits of counters

which requires dividing the entire operating frequency range into a number of subranges .;

The aim of the invention is to increase the speed and expand the range of operating frequencies.

The goal is achieved by the fact that a digital phase meter containing drivers, the inputs of which are connected. with phase meter input terminals. a quantizing pulse generator, a counter and a frequency divider, the first and second frequency multipliers, a reversible counter and a trigger are entered, the output of the first driver is connected to the trigger setup input, the reset input of the reverse counter and the counter reset input, the second driver's output is connected to the trigger reset input and the input installation of a reversible counter, direct trigger output connected to the reversible counter's counting direction control input, reversible counter transfer output connected to the counter input of the counter The output of which is connected to the control inputs of the frequency divider, the outputs of the reversible counter are connected to the control inputs of the frequency multiplier, the counting input of the first frequency multiplier is connected to the output of the frequency splitter, and the output of the first frequency multiplier. The output is connected with the subtracting input of the reversible counter unit, the output of the quantizing pulse generator is connected to the input of the frequency divider and the input of the addition of the reversible counter unit.

The drawing shows a block diagram of the device.

The device contains shapers H and 2, trigger 3, reversible counter 5, multipliers G and 7 frequencies, divider 8 frequencies, generator 9 of quantum pulses.

The formers 1 and 2 are connected to the inputs of the trigger 3, the output of which is connected to the counting direction control input of the counter 4, the overflow output (the output of the last bit of which is connected to the counter input of the counter 5. The subtracting input of the counter 4 is connected via serially connected multipliers b and 7 frequencies and controlled divider 8 with a generator of 9 quantizing pulses, which is also connected to the cyfJiMHpyra input of the counter 4. The output of the forcing device 1 is connected to the input of the installation in O (reset) of the counters 4 and 5. The output of the forcing device 2 Slaves 1 of the counter 4. The discharge outputs of the counter are connected to the control inputs of the multipliers 6 and 7, and the discharge outputs of the counter 5 to the control inputs of the divider 8. The device works as follows With the signal at the input of the generator 1 at its output on Wits short pulse, tilting trigger 3 and switching counter 4 to addition. At the same time, both counters 4 and 5 are reset from this pulse. At the end, the counters 4 and 5 will be filled with quantizing frequency pulses from generator 9. before the input signal da generator 2. During this time between the two input signals to the counter 5 will be accumulated number of pulses P ° t. jn 1. where fo frequency of quantizing pulses; time shift of input signals; the number of bits of the counter is 4. The pulse from the driver 2 tilters - 35 no trigger 3, which switches the counter 4 to the subtraction and simultaneously sets it to state 1. After that, the counter 4 will be written off before the next signal arrives at the driver 1, i.e. . until the end of the period of the input frequency fgj frequency pulses from the output of the multiplier 6. In accordance with the principles of operation of binary frequency multipliers (digital integrators with sequential transfer), for which the general expression about J tftx is true - 1 where. and - respectively, the frequency at the output and the input of the multiplier; And is the coded number on its control inputs; tn - the number of bits multiply tel. You can write the expression for the frequency at the output of multiplier 6 in the form of l NN 1 k; 2 2 "where, k- is the division ratio of the controlled divider 8; not counting from 4 and in the scores to our realms and md and nN - the current value of the number recorded in the counter 4 By taking into account the previously received expression of K, you can write the Increment of the number recorded in the meter 4 on LY 1 on every 1- The counting code for the time d1, is the cumulative. The result of the summation of the pulses by the following frequency for the counter can be obtained from the expression. , f, kf. For a sufficiently large value, the previous expression can be considered as N fdN -J.J24 J H2. As a result, we obtain Thus, the value of the number in the receiver 4 at the end of the signal period at the input of generator 1 is proportional to the phase shift between the input signals. The device has a high theotic speed, which constitutes one period of the input frequency, exceeds the known digital phase meters in terms of indicator. In order to estimate the working frequency range of the phase meter, it is possible, using the previously obtained expressions for K and N, to write hn, Then, taking into account that the maximum value. equal to 2, the ratio between the maximum. and with a shorter input period, it will often be 2 / fo-2. From the expression obtained, it can be seen that the operating frequency range of the proposed phase meter is much wider than in the known device (.i vas). For example, with a frequency of 10 MHz quantizing pulses and 12-bit counters, the operating frequency range

51U688366

The proposed phase meter is thus. The proposed phase is 2, 5 - 1 ,, With ets and error meter, it has a large measurement speed less than and a wide range of operating frequencies.

Claims (1)

A DIGITAL PHASOMETER containing shapers whose inputs are connected to the input terminals of the phase meter, a quantizing pulse generator, a counter and a frequency divider, characterized in that, in order to increase speed and expand the operating frequency range, the first and second frequency multipliers, a reversing counter and a trigger, and the input of the first driver is connected to the input of the installation of the trigger, the reset input of the reverse counter and the input of the reset counter, the output of the second driver is connected to the reset input of the trigger and the input m installation of a reverse counter, the direct output of the trigger is connected to the control input of the direction of counting the reverse counter, the transfer output of the reverse counter is connected to the counter input of the counter, the outputs of which are connected to the control inputs of the frequency divider, the outputs of the reverse counter are connected to the control inputs of the frequency multipliers, the counting input the first frequency multiplier is connected to the output of the frequency divider, and the output of the first frequency multiplier is connected to the counting input of the second frequency multiplier § connected to progress with vho- | ^ house subtracting down counter unit, the generator output pulse quantizing * connected to the input frequency divider _k and adding input down counter unit. 3