SU100181A1 - Device for modulating and demodulating electrical oscillations - Google Patents

Description

The subject of the invention is a device for modulating and demodulating electrical oscillations.

The known devices of the same purpose are made in bridge or ring circuits.

The disadvantage of a modulator made in a bridge circuit is that it skips the output modulating frequencies and their harmonics. The modulator, made according to the ring circuit, does not pass these frequencies, but it contains additional elements - two differential transformers. In addition, 1 on the active resistance of the transformer windings, as well as on the leakage inductance of these windings, part of the voltage of the carrier frequency is lost.

The proposed device, obtsadtsuyu ring circuit advantage in relation to the spectrum, is made without differential transformers, which simplifies the manufacture of the device and do not have the loss of part of the carrier voltage on the active resistance of transformer transformers and on the dispersion inductance.

For this purpose, a circuit is created consisting of two U-chains, connected in parallel with the input and output terminals. The longitudinal branches of the scheme include active

or reactive resistances; 1eni, and in the cross-section - rectifying bridges.

Pa figs. Figures 1 and 2 show diagrams of devices for modulating and demodulating electrically; x oscillations, which show: active resistances /, rectifying bridges Ail n M-2, katunzhi self-induction L n capacitors C.

Rectifiers In the bridges, the MI and M are switched on in such a way that during one half-transition of the current frequency the current passes through the rectifier of the luster M is the transmission direction, and through the rectifiers of the bridge AL in the direction of the blind and locked. Correspondingly, during this half-period, the resistance of the straightening bridge between the points and na is small, and the resistance of the straightening bridge between the points H2 and a. Is large. In the course of the second half-cycle, the current carrying the frequency passes through the output of the bridge MI in the direction; and through the straighteners of the LH bridge. in the direction of transmission, i.e., the resistance of the first bridge will be good, and the resistance of the second bridge is small.

The device depicted on the fpg. 1, works in the following way.

If the device is supplied with a low-frequency coloboin module and the middle points of the production bridge is a carrier frequency oscillation, then during the first half-period of the carrier frequency, the resistance of the bridge MI will be equal to zero, and the bridge M2 will have infinity. During the other half period of the non-frequency, the resistance frequencies of the bridges MI and YIg, respectively, change. Consequently, the current output of the device will be modzlirovannym.

Analogously, this device also acts for the purpose of demodulating electrical oscillations.

The described device, when there are active resistances in its longitudinal branches, introduces more attenuation compared to a ring-shaped modulator, which allows such devices to be connected to a circuit without extension cords.

In the case when it is necessary to reduce the damping of the proposed device, the active resistances in the longitudinal branches of the circuit can be replaced with a reactive. Such a device is depicted in FIG. 2

When using this circuit as a modulator, the oscillation energy of the modulus, their (low) frequencies will not be lost in the elements of the right side of the circuit, and the energy arising in

The oscillator of the side (high) frequency oscillations will not be lost in the elements of the left part of the circuit. Therefore, this circuit will introduce less attenuation into the circuit than the circuit shown in FIG. one.

Subject invention

Claims (2)

1. A device for modulating and demodulating electrical oscillations with suppression at the modulator output of a carrier frequency, with a current spectrum in a load similar to that of a ring modulator, different from that in order to simplify the manufacture of the device, its circuit is made of two N -shaped circuits connected in parallel to the input and output terminals / mothers, and the wires of one of these circuits are connected to the output terminals crosswise and bridge circuits of solid straighteners are included in the transverse branches of the circuits, and resist. 2. The device according to claim 1, characterized in that, in order to reduce the attenuation of the device circuit, reactances are included in its longitudinal branches: between the input terminals and - bridges - inductance, and between the bridges and output terminals - capacitors. 8x0