SU1660124A1 - Rc sine-wave generator - Google Patents

Description

The invention relates to a radio measuring technique. The purpose of the invention is higher

efficiency by increasing the amplitude of the output oscillations while increasing its stability. The device contains resistors 1. 2, 3, 7, 9-12. capacitors 4-6, transistors (T) 8 and 13 and a serial KS circuit 14. The frequency of the output oscillations is determined by the setting of the double T-bridge. formed by resistors 1-3 and 7 and capacitors 4-6. The amplitude balance is provided by selecting the gain of the amplifier formed by T 8 and 13. Serial KS circuit 14 provides the suppression of higher harmonic components in the output signal. 1 il.

1660124 A1

1660124

The invention relates to radio measuring technique and can be used in sources of electrical oscillations.

The purpose of the invention is to increase efficiency by increasing the amplitude of the output oscillations while increasing its stability.

The drawing shows an electrical schematic diagram of a KS generator of sinusoidal oscillations.

KS-generator of sinusoidal oscillations contains the first, second and third resistors 1-3, the first, second and third capacitors 4-6, the fourth resistor 7, the first transistor 8, from the fifth to the eighth resistors 9-12, the second transistor 13 and the serial KS- chain 14.

KS generator of sinusoidal oscillations works as follows.

From the voltage divider consisting of the first and second resistors 1 and 2, through the third resistor 3 to the base of the first transistor 8 is fed the required offset of its operating point. The emitter and collector current of the first transistor 8 is determined by the sixth resistor 10, and the emitter and collector current of the second transistor 13 is determined by the fifth and eighth resistors 9 and 12. The seventh resistor 11 connecting the collector of the second transistor 13 to the emitter of the first transistor 8 allows us to obtain the necessary (1, 05-1,2) the gain of the amplifier voltage, which provides the excitation of oscillations due to the introduction of positive feedback through the parallel branch of a balanced double T-shaped bridge, the attenuation of which is at the frequency of the ball nsa may be 60 dB or more. As a result, the generated frequency is determined by the bridge balance frequency, and the amplitude of oscillations at the output-resistance of the seventh resistor 11, and the amplitude of the generated oscillations at the output practically does not depend on the parameters of the first and second transistors 8 and 13. Moreover, the adjustment of the amplitude of oscillations by changing the resistance of the seventh resistor 11 does not lead to a change in the frequency of the generator. ι

The frequency of generation, determined by the frequency of the balance of the bridge, can be determined by the formula

’2πΚС,

where K is the total resistance of the third resistor 3 and the first and second resistors 1 and 2 connected in parallel;

C - the capacity of the first and second capacitors .4 and 5.

The fourth resistor 7 and the third capacitor 6 are elements of the parallel branch of the double T-shaped bridge, therefore the resistance of the quarter-resistor 7 is chosen equal to K / 2, and the capacity of the third capacitor 6 is equal to 2C.

Consistent KS circuit 14 provides an improvement in the harmonic composition of the output oscillations.

Claims (1)

Claim KS generator of sinusoidal oscillations, containing the first transistor, the first capacitor, the first output of which is connected to the base of the first transistor, the second capacitor, which is connected between the second output of the first capacitor and the common bus, the first, second and third resistors, the first outputs of which are connected to the first output the third capacitor, the fourth resistor, which is connected between the emitter of the first transistor and the common bus, while the second terminals of the first and second resistors are connected respectively to the power bus and the common bus The second terminal of the third resistor is connected to the base of the first transistor, characterized in that, in order to increase efficiency by increasing the amplitude of the output oscillations while increasing its stability, a second transistor is inserted, the base of which is connected to the collector of the first transistor, the type of conductivity which is opposite to the type of conductivity the first transistor, the fifth resistor. which is connected between the second output of the first capacitor and the collector of the second transistor, the sixth resistor, which is connected between the collector of the first transis torus and power bus, the seventh resistor, which is connected between the emitter of the first transistor and the collector of the second transistor, a serial KS circuit, which is connected between the emitter of the second transistor and a common bus, the eighth resistor, which is connected between the emitter of the second transistor and the power bus, and the second the output of the third capacitor is connected to the collector of the orthoric transistor.