SU1190458A1 - Frequency multiplier - Google Patents

Abstract

A MULTIPLACEER OF FREQUENCY containing a short pulse shaper, a comparator, a discretely controlled reference voltage source and a shift register, characterized in that, in order to expand the dynamic frequency range of the input signal of an arbitrary shape, a time-voltage converter, a peak detector and a generator are introduced a saw-tooth voltage, an OR element connected in series and a functional converter, with the inputs of a discretely controlled reference voltage source Connected to the corresponding outputs of the shift register, the output of the discretely controlled reference voltage source is connected to the first input of the comparator, the output of which is connected to the first input of the OR element, the output of the short pulse generator is connected to the input of the time-voltage converter, with the second output of the saw voltage generator and with the second input of the OR element, the input of the shift register is connected to the output of the OR element, and the output of the sawtooth generator is connected to the second input of the comparator. (L

Description

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The invention relates to electrical engineering and the field of radio engineering.

The purpose of the invention is to expand the dynamic frequency range of the input signal of an arbitrary shape. ,

FIG. Figure 1 shows a structural electrical frequency multiplier circuit; in fig. 2 - voltage diagrams at the outputs of the blocks.

The frequency multiplier contains a shaper pulse shaper 1, a sawtooth voltage generator 2, a time-voltage converter 3, a peak detector 4, a comparator 5, a discretely controlled reference voltage source 6., a shift register 7, the element -OR 8, a functional converter 9 .

The frequency multiplier works as follows.

An input signal of arbitrary shape, for example, a sinusoidal (Fig. 2a), or a square wave type is fed to a shaper 1, at the output of which a sequence of narrow pulses is formed with a frequency of the input signal (Fig. 26). These pulses reset the sawtooth voltage of the generator 2 and form the beginning of the working stroke (Fig. 2c). At the same time, the short pulses of driver 1 are fed to converter 3, the output signal of which is fed to peak detector 4. The last output voltage of the latter, the magnitude of which is proportional to the time interval between the pulses of driver 1, is fed to the control input of generator 2.

A sawtooth voltage is applied to the second input of the comparator 5, to the first input of which from a discretely controlled source 6 of the reference voltage 6 (Fig. 2e) a reference voltage is applied, the value of which depends on which output of the shift register 7 has a control signal . After the frequency multiplier is put into operation, the control signal of the shift register 7 is arbitrarily set at any of its outputs. When the saw-tooth voltage reaches the value of the reference voltage supplied to the input of the comparator 5, the latter will operate. The voltage drop from its output (Fig. 2d) through the OR element 8 is applied to the input of the shift register 7, switching it to the state in which the control signal appears at its next output. In this case, the switching of the discretely controlled source 6 of the reference voltage takes place and the next step of the reference voltage appears at the first input of the comparator 5. The comparator 5 is tilted to its original state.

Further growth of the sawtooth voltage and the achievement of the value of the next step of the reference voltage leads to the next tilting of the comparator 5 and the corresponding switchings of the shift register 7 and the discretely controlled source 6 of the reference voltage. With the appearance of the control signal at the last output of the shift register 7 at the output of the discretely controlled source 6 of the reference voltage (Fig. 2e), a reference voltage is established, the magnitude of which is greater than the span of the saw voltage. The sawtooth voltage is reset and the beginning of the new stroke is carried out by the next pulse from the output of the former 1. The same pulse through the OR 8 element switches the shift register 7 and the discretely controlled source 6 of the reference voltage to the position where the minimum (first) reference voltage level.

At the output of the element OR 8, a pulse sequence is formed (Fig. 2e), in which the repetition frequency of kmpuls is the required number of times the frequency of repetition of the pulses of the former 1. The frequency of the output signal of the frequency multiplier is the required number of times greater than the original frequency. When the input signal frequency changes in proportion to the period, the magnitude of the control voltage from the output of the peak detector 4 changes, causing a corresponding change in the slope of the sawtooth voltage of the generator 2, which multiplies the original frequency by an integer and a non-integer number when it varies within wide limits and eliminating the need to re-adjust the discretely controlled voltage source b. In addition, in the frequency multiplier, the dependence of its parameters on the magnitude and shape of the input signal is excluded, since the multiplication of the frequency signal is generated from the normalized sawtooth voltage, the duration of which is equal to the input signal period.

Tuning the frequency multiplier is done by setting the sweep of the sawtooth voltage of generator 2 at two spaced apart points in the frequency range of the input signal. From the output of the element OR 8, the signal enters the functional converter 9, which converts the pulse sequence into a sinusoidal signal (Fig. 2g). A pulse frequency converter, such as a trigger, can also be used as a functional converter. hg Y. - 7,

Claims (1)

A FREQUENCY MULTIPLIER, comprising a short-pulse shaper, a comparator, a discretely controlled reference voltage source and a shift register, characterized in that, in order to expand the dynamic frequency range of the arbitrary arbitrary input signal, a time-voltage converter, a peak detector and a sawtooth voltage generator are introduced, a series-connected OR element and a functional converter, while the inputs of a discretely controlled reference voltage source are connected They are connected to the corresponding outputs of the shift register, the output of the discretely controlled reference voltage source is connected to the first input of the comparator, the output of which is connected to the first input of the OR element, the output of the short-pulse generator is connected to the input of the time-voltage converter, with the second input of the sawtooth generator and with the second input OR element, the input of the shift register is connected to the output of the OR element, and the output of the sawtooth voltage generator is connected to the second input of the comparator. FIG. 1 119045 ")