SU752670A1 - Cascade-type frequency multiplyer - Google Patents

Description

The invention relates to epistechnology and can be used as a frequency converter in devices of information-measuring equipment. Devices for frequency multiplication are known, based on the allocation of higher harmonic components by the oscillatory circuit 1. A disadvantage of the devices is the inability to use them in wide frequency range, since it is necessary to rearrange the resonant circuit. CRT-based spatial coding multipliers have a wide operating frequency range of 2. However, they are very complex in design. Frequency multipliers with delay lines, one-shot, counting loops lose phase information, which is their main drawback. Feedback multipliers have a wide frequency range while preserving information. However, they are complex in design, as they contain a phase detector, a low-pass filter, a controlled oscillator, and a frequency divider. The disadvantage of a frequency multiplier with a spatial coding based on a multiwinding transformer is the need to have a multi-phase supply voltage. Frequency multipliers based on two-crawl rectifiers are widespread. Their disadvantages are either the need for a transformer. Closest to the proposed & a cascade frequency multiplier, which contains a tripping voltage driver, the input of which is connected to the generator output, and the output to the input of the multiplier cascade of the h. The disadvantage of this multiplying device is the presence of separation transformers in its circuit, which complicates the design, the technology of an industrial process, and also reduces the device's complexity. The chain of the invention is to simplify and increase the reliability of the device. This circuit is achieved by the fact that in a cascade frequency multiplier, containing a triangular voltage driver, whose input is connected to the generator output, and Bbjxoa - to the input of the first stage - each multiplier stage consists of two transistors, the collector of the first transistor is connected to one power bus through a resistor and to the base of the second transistor, the collector of which is connected to the same power bus, and the emitter forms the output terminal of the cascade and is connected to the input of the next stage, the base of the first transistor and through the second resistor - on the other bus, which is common, the emitter of the first transistor is connected to the common bus through two additional resistors connected in series, in parallel with one of which a capacitor is connected. In addition, in order to improve the operating conditions (simplifying the adjustment by the constant component), an additional resistor, in parallel with which the capacitor is switched on, is made adjustable. FIG. 1 shows a schematic diagram of the device; in fig. 2 - voltage diagrams, explaining the principle of the proposed device. In a cascade frequency multiplier, the output of the generator 1 is connected to a frequency generator 2 of a triangular voltage, the output of which is connected to the input of the first stage of frequency multiplier 3, the base of the first transistor of the cascade. Each cascade, double (doubling), contains a transistor 4, the collector of which is connected to the power bus through a resistor 5, and the emitter through two resistors 6 and 7 connected in series to a common bus, and in parallel to one of the resistors a capacitor 8 is connected, the second KSCV transistor Cad 9, the base of which is connected to the collector of the first transistor, the collector of which is connected to the power bus, and the emitter-output stage is connected to the input of the next stage 1O i via a resistor 11 to the common bus. The device works in a special way. From the generator, the frequency of which must be multiplied, the signal is arbitrarily fed to the input of a triangular voltage driver, from which the triangular voltage is fed to the input of a frequency multiplier - the base of the first transistor of the cascade. The resistors in the emitter and collector circuits of the first transistor, which are load for the variable component, are equal, and the value of the resistor in parallel to which the capacitor is connected is selected so that, in the absence of a variable component at the input, the transistor is at the saturated state boundary. UBX x and This equality will be fulfilled for the values of the variable component UB ,, O- (2) For example, as the input voltage increases, since the transistor is at a price, the voltage across the collector will be synchronous increases with the voltage on the base. When the input voltage decreases, the voltage at the collector will also decrease to the point in time at which .o. (3) The time interval O-t at which equality (1) and condition (2) is fulfilled is shown in FIG. 2 .. When decreasing the variable component is less than zero Ue; ABOUT . the transistor goes out of saturation state and starts closing. At the same time, the collector potential begins to increase as the resistance of the transistor increases (the cascade works in the inverting amplifier mode when the condition (1) is fulfilled). The ratio UK, (5) will correspond to this mode (in Fig. 2, this corresponds to a period of time). An emitter follower is made to match the load on the second transistor. Thus, the variable component of the output voltage will retain the phase and shape of the input voltage, while having twice the frequency. Invention 1. A cascade frequency multiplier, a triangle voltage driver, the input of which is connected to the generator output, and the output to the input of the first stage, different

575

By simplifying and increasing the reliability circuit, each multiplier stage consists of two transistors, the collector of the first transistor is connected to the same power bus, through a resistor and to the base of the second transistor, the collector of which is connected to the same power bus, and the emitter forms the output terminal of the cascade and connected to the input of the next stage, the base of the first transistor and through the second resiotor to the other power bus, which is common, and the emitter of the first transistor is connected to the common bus through two connected in series to An additional resistor, in parallel to one of which is a capacitor.

706

2. The multiplier pop. 1, I distinguish w and so that in order to improve the operating conditions, the additional resistor, in parallel with which the capacitor is switched on, is made adjustable.

Sources of information taken into account in the examination

1.Rizkin I.Kh. Multipliers and frequency dividers. M., Holy Horn, 1976.

2.Novitsky P.V., Knorring V.G., Gutpikov B.C. Digital devices with frequency sensors. L., Energie, 1970.

3. USSR author's certificate Ni 124004, cl. - H 02 M 5/16, 1960.

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Claims (2)

Claim 1. A cascade frequency multiplier containing a triangular voltage former, the input of which is connected to the output of the generator, and the output is connected to the input of the first cascade, characterized in that with a simplification and reliability circuit, each cascade of the multiplier consists of two transistors, the collector of the first transistor is connected to one power bus, through a resistor and to the base of the second transistor, the collector of which is connected to the same power bus, and the emitter forms the output terminal of the cascade and is connected to the input of the next cascade, the base of the first ican and through the second rezio- ₁₀ torr - on the other bus power, which is common with the emitter of the first transistor is connected to ground via two series-connected additional resistor in parallel one of which capacitor is connected. 2. The multiplier of n? 1, due to the fact that in order to improve operating conditions, an additional resistor, in parallel with which 5 capacitor is connected, is made adjustable.