SU636771A2 - Frequency multiplier - Google Patents

Description

one

FIELD: radio engineering.

Basically auth. St. No. 296215 describes an analog frequency multiplier, which consists of a narrow imposer, a sawtooth generator, a coupling capacitor, a key, a threshold element, a reference voltage source, and a reference voltage divider.

This frequency multiplier has an insufficient frequency range.

The purpose of the invention is to expand the frequency range.

The goal is achieved in that the frequency multiplier, which contains a narrow pulse shaper, a sawtooth generator, a coupling capacitor, a key, a threshold element, a reference voltage source, and a reference voltage divider, introduces two elements compared to the threshold voltage source and is controlled a divider, whose input is connected to the output of a sawtooth generator, the output is connected

2

with the input of the reference block, and the control input with the output of one of the elements, cf. mon; the output of the second element of the comparison unit is connected to the control input of the sawtooth generator, the first inputs of the comparison elements are the connection to the output of the threshold voltage source, and the second inputs of the comparison elements are connected to the output of the reference voltage block.

The structural electrical circuit of the described frequency multiplier is shown in the drawing.

The multiplier consists of fork narrow pulse 1, sawtooth generator 2, separation capacitor 3, threshold element 4, switch 5, voltage reference unit 6, division 1 of voltage support body 7, controlled accelerator 8, comparison elements 9 and 10 source of threshold voltage 11.

The principle of operation of the multiplier is as follows.

The input signal is fed to the narrow pulse shaper 1, at the output of which pulses are formed with a period of the input signal. When the first pulse arrives, the voltage at the output of the sawtooth generator 2 becomes zero. At the same time, the key 5 closes, which discharges the separation capacitor 3. At the end of the pulse, the key 5 opens and a linearly increasing voltage is formed at the output of the saw-tooth generator 2. This signal goes through a controlled amplifier 8 to a reference voltage block 6, where Wmr is located and its maximum value is remembered, and through a split capacitor 1 to the first input of the threshold element 4. From the voltage block 6, the signal goes to the first and second inputs, respectively, of the elements. Comparison 9-10 and through variable resistor 7 - to the second input of the threshold element 4.

When the sawtooth voltage at the first input of the threshold element 4 becomes equal to the reference voltage at the second input, the threshold element is triggered and the signal from its output goes to switch 5. The switch closes and the separation capacitor 3 is charged to the potential voltage. Directly at the first input of the threshold element 4 becomes zero, and it returns to its original state. The sawtooth voltage continues to increase. When the potential at the first input of the threshold element becomes equal; zero, it returns to its original state. The sawtooth voltage continues to increase. When the potential at the first input of the threshold element again reaches the level & n of the reference voltage, the process is repeated, etc. before the next pulse arrives from the narrow pulse shaper 1. When the output signal frequency changes, the sawtooth voltage changes, but the multiplication factor of the device remains the same, since the reference voltage is formed from the straightened sawtooth. When the frequency of the input signal varies within certain limits set by the source of the threshold voltage 11, the feedback signals from the elements of comparison 9 and 1O are absent, and the sawtooth voltage generator 2 has a certain time constant, and the controlled amplifier 8 is determined and constant transfer ratio. When the frequency of the input signal decreases below a predetermined voltage, produced by the reference voltage unit 6, it becomes greater than the threshold voltage from the source of the threshold voltage 11 to the reference element 9. At the output of the comparison element, the error signal appears that affects the time constant sawtooth generator 2. The constant time increases — the reference voltage stabilizes.

When the frequency of the input signal is greater than the set value, the voltage generated by the reference voltage unit 6 becomes less than the threshold voltage from the source of the threshold voltage 11 to the reference element 10. The output signal of the comparison element Yu affects the control input of the controlled amplifier 8, raising it transfer coefficient until the reference voltage becomes equal to the threshold voltage. At. By adjusting the feedback, the multiplication factor of the device does not change for the reason given above.

Claims (1)

1. Certificate of Authors ı 296215, cl. H 03 B 19/20, 02.28.68. Bjy ± 1 f. ±