RU150918U1 - SOLID POWER AMPLIFIER - Google Patents

Abstract

A solid-state power amplifier, configured to be powered from a single DC source and containing a preamplifier connected to a parallel type power divider with N sections, N outputs of which are connected to amplification channels through phase correctors, the outputs of amplification channels are connected to a power adder, and the adder and a parallel type power divider with N sections on quarter-wave line segments with in-phase excitation mode and a grounded decoupling resistor, characterized in that the input of the power amplifier and the output of each amplifier line contain pass-through signal couplers, and the branched signals are fed to the address turn-off control module (SAW), while the signal branched from the input of the power amplifier passes through a phase corrector, and the SAU module contains an input signal divider, block separation of distortion signals in the amplification channels, a unit for setting threshold levels of permissible distortions, a comparison unit and a shaper of switching off amplification channels, the generated signals of which they are dull on the amplification channel address switch-off module (AVCU), while a single DC source supplies the amplification channels through the amplification channel address-turn off module (AVCU).

Description

The utility model relates to the technique of semiconductor devices, namely to high-frequency amplifiers on semiconductor devices, and can be used in microwave transmitting devices.

The current state of semiconductor technology does not provide high power levels in the microwave wavelength range in single-channel power amplifiers. In this regard, widespread solid-state multi-channel amplifiers of the microwave wave range with the summation of high-frequency power.

A solid-state power amplifier is known (the book “Microwave Semiconductor Transmitters” Kaganov VI, Publisher - M .: Radio and Communications, 1981, pp. 6, 7, Fig. 1.2), containing a preliminary amplifier, power dividers, amplifiers, and a power adder . The disadvantage of such a solid-state power amplifier is the distortion of the output signal exceeding a predetermined level by a solid-state power amplifier in the event of such distortions in the amplifier channels.

Also known is a solid-state power amplifier (patent RU No. 2343625 C1, IPC H03F 3/19, publ. 10.01.2009) containing a preamplifier, microstrip power divider with phase correction elements, channel amplifiers, waveguide adder, detector. The known device for its purpose and technical essence is the closest to the proposed device and therefore is selected as a prototype. The disadvantage of the prototype is exceeding a predetermined level of distortion of the output signal by a solid-state power amplifier in the event of such distortions in the amplification channels.

The problem that this utility model is aimed at is the creation of a solid-state amplifier in the microwave wavelength range with the addition of high-frequency power with improved technical characteristics.

The utility model is aimed at maintaining the linearity of a solid-state multi-channel microwave power amplifier at a given level when an unacceptable level of non-linearity occurs in the amplifier channel. The specified technical result is achieved by the fact that N amplifiers are combined into a single circuit, in a way that allows you to turn off the amplification channel that has exceeded a predetermined threshold level of distortions introduced into the output signal and, as a result, maintain the linearity of the power amplifier at a given level.

The problem is solved in that a solid-state power amplifier is additionally introduced a pass-through signal coupler, the input of which is the input of the power amplifier, and the feed-through output is connected to the input of the pre-amplifier, the output of which is connected to the input of the power divider 1 / N, the outputs of which are connected to N amplification channels , each of which has an input phase corrector at the input, the output of which is fed to the channel amplifier, the output of which is connected to the input of the pass through a signal splitter connected to the input of the power adder N / 1, from the output of which the signal is fed to the output of a solid-state power amplifier, an additional amplification channel address switch-off module (AVCU) and amplification channel address turn-off control module (SAW) are additionally introduced, to the separate inputs of which additional the outputs of the couplers of the signals from the amplifier channels and, the additional output of the coupler at the input of the PA.

The problem is also solved by the fact that:

to the SAW module from the input coupler, the reference signal to the distortion extraction unit is supplied through the phase corrector and the input signal divider 1 / N, where as a result of addition in antiphase (subtraction) in the quadrature bridges with signals from the amplification channels, N error signals are generated, which are then compared with predetermined threshold levels and in case of exceeding them, a signal is generated that goes to the AVCU module to turn off the corresponding amplifier;

quadrature bridges on strip lines (the book “Devices for Adding and Distributing Power of High-Frequency Oscillations”) / V.V. Zaentsev, V.M. Katushkina, S.E. London, Z.I. Model; Edited by Z.I. Model. - M: Soviet Radio, 1980. Fig. 6.16, p. 82);

parallel type adder and power dividers with N sections on quarter-wave line segments with in-phase excitation mode and a grounded decoupling resistor (book “Devices for Adding and Distributing High-Frequency Oscillation Power” / V.V. Zaentsev, V.M. Katushkina, S.E. London , Z.I. Model; Edited by Z.I. Model. - M: Soviet Radio, 1980. Fig. 8.16, p. 115).

Power amplifier lines are powered from a single current source with the ability to shut off through N managed keys.

A new set of essential features of the claimed amplifier allows you to automatically turn off the amplifier line, the operation of which introduces distortions into the output signal exceeding the threshold level. Moreover, the level of distortion of the output signal of the PA does not deteriorate below a predetermined level.

From the prior art there are no technical solutions that are inherent in all the essential features given in the formula. Therefore, we can assume that the proposed device meets the patentability criterion of "novelty."

The invention is illustrated by drawings, which represent structural electrical circuits:

in FIG. 1 - solid state power amplifier;

in FIG. 2 - control module address switching off amplification (SAW);

in FIG. 3 - module address off the gain channel (AVCU).

Solid-state power amplifier operates as follows.

Through a passage coupler (1), the microwave signal is fed to the input of the pre-amplifier (2), which consists of several amplification stages performed on field-effect transistors according to a common source circuit, is amplified and fed to the input of a parallel type power divider (3) on quarter-wave segments of parallel lines type, the outputs of which are connected to N amplification channels.

Each of the N amplification channels has the ability to change the phase length with a phase corrector (4).

In the amplification channels, the signals are amplified by a channel amplifier (5) on a powerful field-effect transistor and fed through bushing couplers (6) to a power combiner (7), the output of which is the output of a PA.

Part of the input signal from the coupler (1) through the phase corrector (10) and the input signal divider 1 / N (14) folding in antiphase in N quadrature bridge devices (12) with signals from the couplers (6) emit error signals that are sent to the unit comparisons and a shaper of shutdown signals (11). If the levels of the received error signals are exceeded, the threshold levels of permissible distortion (13) set in the unit for setting the threshold signal are generated to turn off the corresponding amplifier line, via the connecting bus to the AVCU module (9) as shown in FIG. 2.

The AVKU module (9) contains N controlled keys made on high-power field-effect transistors, through which power from the current source (16) is supplied to the channel amplifiers (5). The preamplifier (2) is powered without automatic shutdown as shown in FIG. 3.

As a result of automatic shutdown of the amplification channel, which exceeded the allowed threshold level of distortions introduced into the output signal, the linearity of the power amplifier is maintained at a given level.

Claims (1)

A solid-state power amplifier, configured to be powered from a single DC source and containing a preamplifier connected to a parallel type power divider with N sections, N outputs of which are connected to amplification channels through phase correctors, the outputs of amplification channels are connected to a power adder, and the adder and a parallel type power divider with N sections on quarter-wave line segments with in-phase excitation mode and a grounded decoupling resistor, characterized in that the input of the power amplifier and the output of each amplifier line contain pass-through signal couplers, and the branched signals are fed to the address turn-off control module (SAW), while the signal branched from the input of the power amplifier passes through a phase corrector, and the SAU module contains an input signal divider, block separation of distortion signals in the amplification channels, a unit for setting threshold levels of permissible distortions, a comparison unit and a shaper of switching off amplification channels, the generated signals of which they are dull on the amplification channel address switch-off module (AVCU), while a single DC source supplies the amplification channels through the amplification channel address-turn off module (AVCU).

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