SU1370714A1 - Frequency multiplier - Google Patents

Abstract

Invention m. used in measurement technology as a driver reference signal. The purpose of the invention is to spread the frequency range of the input signal. The device contains a sawtooth voltage generator 1, a capacitor (K) 2 ,, comparator 3, keys 4, and 4, voltage divider 5, memory block 6. K 2, and the counting trigger 7 are introduced. When the frequency of the input signal changes, kozf. frequency multiplication does not change, since the reference signal is formed as a part of the voltage from the sweep of the voltage of the generator 1. The transient charging process and K 2, and 22 to the beginning of the formation of the output pulse ends and its duration is excluded from the formation process. 2 Il.

Description

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The invention relates to radio engineering and communication and can be used in measurement technology as a driver of a reference signal.

The aim of the invention is to expand the frequency range of the input signal.

FIG. Figure 1 shows a structured electrical frequency multiplier circuit; in fig. 2 - time diagrams that show his work.

The frequency multiplier includes a sawtooth voltage generator 1, the first 2, and the second 2 capacitors, the comparator 3, the first A, and the second 4 keys, the voltage divider 5, the memory block 6, and the counting trigger 7.

The frequency multiplier works as follows.

The input signal in the form of narrow pulses impulses the generator 1 of the sawtooth voltage and discharges the first 2 and second 2 capacitors through the first 4 and second 4 keys. At the end of the input pulse, the voltage at the output of generator 1 (Fig. 2a) rises linearly. Its swing is determined by the input signal period. In memory block 6, the amplitude value of the sawtooth voltage is stored. Voltage divider 5 determines the multiplier of the frequency multiplier. If the counting trigger 7 is in the zero state, then the signal from the generator 1 to the first signal input of the comparator 3 is provided through the first capacitor 2 (and the charge from the second capacitor 2 to the value of the generator voltage 1. As the comparator 3, the third input is a comparator. At the third signal input of the comparator 3, the voltage is zero because the second switch 44 is open. At the time when the voltage at the first input of the comparator 3 (Fig. 26) is equal to the reference voltage that from the output of the voltage divider 5 to the second input of the comparator 3, a pulse is formed at its output that converts the counting trigger 7 into a single state (Fig. 2e). In this case, a saw voltage is formed at the third input of the comparator 3 (Fig. 2c). ), and the voltage value at the first input of the comparator 3 quickly reaches zero. At the moment when the sawtooth

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the voltage at the third input of the comparator 3 is compared with the reference voltage, a pulse is generated at its output, which again switches the counting trigger 7. Then the process repeats. When the input signal frequency changes, the frequency multiplication factor does not change, since the reference signal is generated as part of the voltage from the voltage swing of the generator 1. In FIG. 2d shows an equivalent diagram of the total voltage of the first and third inputs of the comparator 3, which is compared with the reference voltage. It can be seen from the diagrams (Fig. 26, c, d) that the transient charging of the first and second capacitors 2 and 2, respectively, to the beginning of the formation of the output pulse ends and its duration is excluded from the process of forming the output pulses (Fig. 2e) of the frequency multiplier.

Claims (1)

Invention Formula A frequency multiplier comprising a serially connected sawtooth generator, a first capacitor and a comparator, a serially connected memory block whose input is connected to the output of the sawtooth generator, and a voltage divider whose output is connected to the second input of the comparator, the first key, which is connected between the point of connection of the first capacitor with a comparator and the common bus, the second key, with the first control input of the first key connected to the input of the sawtooth generator and is an input of a periodic pulse sequence, characterized in that, in order to expand the frequency range of the input signal, a counting trigger and a second capacitor are inserted, which is connected between the output of the sawtooth generator and the third input of the comparator, the second switch is connected between the connection point of the second capacitor the third input of the comparator and the common bus; the first control input of the second key is connected to the input of the saw-tooth generator, the second control inputs of the first and w cerned keys are respectively connected to 31370714A The direct and inverse codes of the counter are connected to the output of the computer trigger, the counting input of the corona. Fv X FIG. Z