SU752183A1 - Converter of relative difference in frequencies of pulses into dc voltage - Google Patents

Description

This invention relates to radio measurements.

A known frequency difference converter for pulses, comprising a control device, the inputs of which are supplied with signals of the compared trigger frequencies and averaged device. The input signals, having passed the control device, act on the trigger so that at its output a sequence of pulses with a duration equal to the difference of the periods of the input signals with the frequency of the smaller of the two compared signals is formed. The averaging device extracts a constant component of this sequence, forming the output signal 1

The disadvantage of this device is the lack of speed.

The closest in technical essence to the present invention is a converter comprising a control unit, the inputs of which are connected to the input buses, and one of the outputs is connected to the trigger input, the output of which is connected to the input of the averaging element, the element

a comparison, a switch and two memory elements, one of the inputs of each is connected to the corresponding output of the control unit, and the outputs are connected to the inputs of the switch M.

The disadvantage of this converter is the lack of accuracy of the conversion.

The purpose of the invention is to increase the accuracy of the conversion.

The goal is achieved by the fact that the converter contains a 5DI control unit, the inputs of which are connected to the input buses, and one of the outputs is connected to the trigger input, the output of which is connected to the input of the averaging Element, the comparison element, the switch and

two memory elements, one of the inputs of each is connected to the corresponding output of the control unit, and the outputs are connected to the inputs of the switch,

25 input two keys, two R C-circuits and a standby multivibrator, the input of which is connected to the trigger output, and the output is connected to the control input of one key, the output of which is connected

30 with the first RC circuit and one input of the .SHTa comparison element, the second input of which is connected to the counting trigger input, the second inputs of the memory elements are connected to the second RC circuit and the output of the second key, the control input of which is connected to the auxiliary output of the control unit.

The drawing shows a structural electrical circuit of the proposed converter.

The converter contains a control unit 1, a trigger 2, an averaging element 3, a CS circuit 4, bit switches 5 and b, memory elements 7 and 8, a switch 9, a comparison unit 10, an RC circuit 11, a waiting multivibrator 12

Input signals are supplied to the input buses 13 and 14, and the output signal is removed from output 15.

The converter works as follows

During the period T, the switch 5 is open, and the capacitor of the RC circuit 4 is charged. The voltage U, to which this capacitor is charged during this time, is equal to

. ,

where C is constant time. By a command from 1 control, this voltage is stored by memory element 8.

The switch 5 then closes and the capacitor of the RC circuit 4 is discharged.

With the start of the period T, the switch 5 opens again, and during this period the charge of the capacitor occurs up to

UQ (1 st), which

tensions and i

then it is remembered by a command from the control unit 1 of the memory element 7.

The comparison unit 10 compares alternately the voltages with the memory elements 7 and 8 with the output voltage of the RC circuit 11. The connection of the control unit 10 to the outputs of the memory elements 7 and 8 is carried out using a switch 9 controlled by the signals of the control unit 1.

As long as the rising voltage at the output of the RC circuit 11 is less than the voltage from element 7, the input of block 10 is connected via switch 9 to the output of block 7. At the time of comparison of these voltages, block 10 sends a pulse to the counting input of trigger 2, and the switch is switched 9 in the upper position.

When the voltage on the RC circuit 11 reaches the voltage level from the output of the element 8, the comparator unit is triggered again and again gives a pulse to the trigger input, which translates it to the initial state. The front of the trigger starts the waiting multivibrator 12, which c. Using switch 6, a discharge is performed on the RC circuit 11 controller. Next, the operation of the circuit is repeated.

The time t during which the capacitor of the JC-circuit 11 is charged from zero to the voltage from the output of block 7

tl is Tjj- (p- | is similar to the charge time

the same capacitor to the level

yarn block 8, tr

 T ,, therefore, the duration of the Sc. output pulse generated by the trigger

-TJ

The period of these pulses T (in neglect of the discharge time, which is easy to make sufficiently small), is equal to

T - T

1 - averaging element 3 generates a constant component of this pulse stream, which is the output signal of the entire device

T-T 1

T,

It is proportional to the relative frequency difference.

From the operation of the proposed device, it follows that the frequency of the averaged pulses here is a factor (J times the frequency F, this allows the averaging device to be less inertial, which causes an increase in the speed of the device.

Claims (1)

1. USSR author's certificate 252470, class, H 03 K 13, / 00, 12.06.62. .2, Japanese Application 45-130782, CL.110NO, 29.12.70, 81 / f