SU799099A2 - Frequency multiplier - Google Patents

Description

one

The invention relates to radio engineering and can be used to increase the static frequency deviation in control systems of automation systems and instrumentation technology.

According to the main author. St. No. 296215 is known a frequency multiplier comprising a sequentially connected driver, a sawtooth generator, a coupling capacitor and a threshold device, as well as a key, a reference voltage block and a voltage magnitude divider, while a switch is connected in parallel with the input of the threshold device, the inputs of which are connected to the driver and the output of the device, and the series-connected voltage reference block and voltage divider are connected between the saw-tooth voltage generator and the reference voltage input to yarn threshold device 1.

However, the known device does not provide a sufficiently wide range of variation of the multiplication coefficients by obtaining fractional multiplication coefficients, which is caused by the synchronization of each first output pulse after zeroing.

a sawtooth generator with the beginning of the period of the input frequency signal

The purpose of the invention is to expand the di-. the variation of the multiplication coefficients by obtaining fractional multiplication coefficients.

The goal is achieved

o the fact that in the frequency multiplier, which contains a serially connected driver, a sawtooth generator, a coupling capacitor and a threshold device, as well as a key, a voltage reference block and a voltage magnitude divider, the key is parallel to the input of the threshold device; connected to the driver and output of the device, and the series-connected reference voltage block and voltage divider are connected between the saw-tooth generator and the input

5 of the reference voltage of the threshold device, between the output of the former and the auxiliary Exit of the threshold device a memory element, the first and second control inputs are entered

0 which are connected respectively to

input and output threshold device.

FIG. Figure 1 shows the structural electrical circuit of the device proposed; in fig. 2 - time diagrams that show his work.

The frequency multiplier includes a driver 1, a sawtooth voltage generator 2, a coupling capacitor 3, a threshold device 4, a switch 5, a reference voltage block 6, a reference voltage divider 7, and a memory element 8.

The device works as follows.

The input signal is fed to the driver 1, at the output of which narrow pulses are generated with the period of the input signal. When the first pulse arrives, the voltage at the output of the generator 2 of the saw-tooth voltage 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 linear increase in voltage begins to form at the output of the sawtooth voltage generator 2. This signal enters the reference voltage block b, where its maximum value is memorized, and through separation capacitor 3 to the first input of the threshold device 4. From the output of the voltage reference block 6, the signal goes through the divider 7 reference voltage to the second input of the threshold device 4 At the point in time when the sawtooth voltage at the first input of the threshold device 4 becomes equal to the reference voltage at the second input, the threshold device 4 is activated and the signal from its output goes to switch 5, which closes and separation capacitor 3 is charged to the potential of the reference voltage. The voltage at the first input of the threshold device 4 continues to increase after the opening of the key 5 again from the zero level. When the potential at the first input of the threshold device 4 again reaches the level of the reference voltage, the process repeats until the next pulse arrives from the generator 1. 1 As the frequency of the input signal changes, the value will change

sawtooth, but the multiplication factor of the device will not change, since the reference voltage is formed from a straightened sawtooth. With fractional multiplication factors, the voltage at the first input of the threshold device 4 will reach a certain value. This voltage is stored in memory element 8 by a signal from driver 1 and is fed to the third input of threshold device 4, constructed, for example, according to the summing comparator circuit. This signal can be thought of as summable with the signal from the generator 2 of the sawtooth voltage, or subtracted from the signal voltage divider 7 7. The first pulse of the output frequency of the device after the beginning of the input signal period zeroes memory element 8 during the subsequent part of the input signal period works as stated above.

FIG. 2a shows the voltage at the output of the sawtooth voltage generator 2; 2 b is the voltage at the first input of the threshold device 4; 2 s is the equivalent differential voltage of the support of the threshold device 4; 2 d is the voltage across memory element 8.

The proposed device allows to significantly expand the range of variation of multiplication factors by obtaining fractional multiplication factors.

Claims (1)

1. USSR author's certificate No. 296215, cl. H 03 B 19/00, 1971 (prototype). I I I I h I I l - iifEJT 1 r, I I I I