SU1434537A1 - Two-channel power amplifier - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to increase the efficiency when operating in a wide frequency range. The two-channel power amplifier contains a phase shifter 2, amplifiers 3, 5, an output power adder 4. Ach to achieve the target, sequentially connected amplitude detector 6, trigger 7 of Shiit and oscillator 8 AM, control of phase shifter 9, blocks 10, 11 of sampling-storage, input divider 1 of power are introduced. With the help of a controlled phase shifter 9 and by changing the coefficients. The transmission of amplifier 5 provides automatic alignment of the amplitudes and phases of the summed signals at the inputs of the output adder 4, which increases the efficiency of the device. This effect is especially noticeable when performing amplifiers 3.5 in a multistage manner. 2 Il. (L

Description

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The invention relates to radio equipment and can be used in radio transmission equipment.

The purpose of the invention is to increase the efficiency by operating in a wide frequency range.

Fig. 1 shows a structurally | spectral scheme of a two-channel power amplifier; Fig. 2 shows the epurene of the voltage at the output of the generator a | 1-pulse-modulated oscillations. I Two-channel power suppressor holds power divider 1, phase: rastel 2, first amplifier 3, high power adder 4, second equalizer 5, amplitude detector 6, t) Schmitt rigger 7, generator 8 amp n and modulated oscillations , the phase shifter 9 and the first 110 and second 11 blocks of the sample-store.

; Dual-channel power amplifier works as follows. The input signal is split in half in the input blender 1 and fed to the inputs of the first Bjoro 3 and second 5 amplifiers, in which it is amplified. Amplified signals from {are multiplied in the output from the mapper 4 and p | are transmitted to the output of the device. With the help of controlled phase shifter 9 AND; due to a change in the transmission coefficient of the second amplifier 5, the iplits and phases of the summed signals are automatically aligned; and the inputs of the output adder 4, which increases the number-1 effect of (and devices. This effect is especially noticeable when the first 3 and BJTOporo 5 amplifiers on a multistage circuit.

Automatic alignment of the amplitudes and phases of the signals at the inputs of the output adder 4 is as follows. The output voltage of the output adder 4 from the ballast output is fed to the amplitude detector 6, where a constant component is output that is fed to the input of the trigger 7. If the voltage at the ballast output of the output adder 4 exceeds the specified threshold, then the trigger 7 and starts the generator 8 of amplitude-modulated oscillations, the output voltages of which have the form shown in Fig. 2. Simultaneously, the signals are allowed to pass through the first 10 and second 11 sampling-storage units. Under the action

These signals periodically change the phase and amplitude of the voltage at the output of the second amplifier 5. When the phase imbalance and voltage amplitudes at the inputs of the output adder 4 are reduced to an acceptable level, the trigger 7 switches to its original state, locking the generator with 8 amplitude-modulated oscillations and transfer of the first 10 and second 11 sampling-storage units to the storage mode of the input information.

Phaser 2 provides phase alignment of the input signals of the output adder 4 in the absence of a control action on the control input of the controlled phase shifter 9.

The generator 8 of amplitude-modulated oscillations contains an input commutator with self-modulation (oscillator of oscillating oscillations) and an output phase splitter providing a phase shift between the voltages on the first and second outputs by 90 degrees. The oscillator of intermittent oscillations is performed according to a known scheme.

Claims (1)

Invention Formula A two-channel power amplifier containing a series-connected phase shifter, a first amplifier and an output power adder, a second amplifier, the output of which is connected to the second INPUTS5M video output power adder, characterized in that, in order to increase the efficiency in a wide frequency range, series-connected amplitude detector, 11It trigger, and generator of amplitude-modulated oscillations, controllable phase shifter, first and second sampling-storage unit, a power divider, while the second amplifier is provided with a control input, the amplitude detector input is connected to a ballast output of the output power adder, the phase shifter is connected between the second output of the power divider and the second amplifier input, the first and second sampling-storage units are connected between the first output of the generator of amplitude-modulated oscillations and the control input control e31434537 between the second inputs of the first: and second blocks, the amplitude-modulator-storage-generator generator is combined between the sustained oscillations and the control input and connected to the output of the second amplifier's trigger, controlling with Schmitt. FIG. 2