RU2207714C2 - Pulse shf amplifier - Google Patents

Abstract

FIELD: radio communication, radiolocation. SUBSTANCE: pulse SHF amplifier has power supply source, SHF amplifier with modulator in circuit of control grid, starter comprising HF communication circuit, detector and amplifier. Starter in inserted with self-excited oscillator with impact excitation to which input output of former of shock video pulse is connected. EFFECT: diminished amplitude and phase noises. 2 dwg

Description

 The invention relates to pulsed amplifiers of ultra-high frequency (microwave) and can be used in radio communications, radar and other fields of technology.

 Known pulse microwave amplifiers with a modulator in the control grid circuit of the amplifying element (TWT, klystron). The modulator in this circuit is at a high voltage of the cathode of the microwave amplifier element. To transfer the start pulses to the modulator, various starting devices are used [1].

где

- несущая частота радиоимпульса.High frequency triggering devices have good pulse transmission characteristics and are a continuous oscillator of an amplifier that is gated by triggering pulses. In this case, the leading edge of the trigger pulse does not coincide in phase with the output voltage of the continuous oscillator. As a result, the front of the trigger pulse has a “jitter” Δt:

Where

- carrier frequency of the radio pulse.

 Known amplifier pulsed microwave power [2], selected as a prototype. One of the possible options for starting the modulator specified in the patent is the transmission of a radio pulse at a high frequency through high-frequency (HF) communication coils. Gated radio pulses arrive at the detectors. After amplification on the formers, the start pulses arrive at the control inputs of the modulator keys.

 The disadvantage of the prototype is the high level of noise (interference). Jitter on a modulating pulse is reflected in spurious modulation in the microwave amplifier.

 The technical result to which the claimed invention is directed is to eliminate “jitter” at the front of the modulating pulse and, as a result, reduce the amplitude and phase noise of the microwave amplifier.

 The expected technical result from the use is achieved by the fact that in a pulsed microwave amplifier with a modulator in the control grid circuit, a self-oscillator with a shock excitation circuit is inserted into the starting device, the input of which is the output of the driver of the shock video pulse. An oscillator with a shock excitation circuit performs automatic phasing of its output radio pulse by the leading edge of the shock video pulse of the driver. This eliminates the "jitter" on the modulating pulse, while the intrinsic noise of the modulator is much less compared to the noise introduced by the "jitter".

 Functional diagram of a pulsed microwave amplifier is shown in figure 1. 2 shows stress plots.

 The device operates as follows.

 Rectangular video pulses (diagram 1, figure 2) are supplied to the oscillator 1 (Fig. 1) from the shock excitation circuit (diagram 1, Fig. 2) from the output of the shock video pulse shaper 2, which determine the duration and phase of the oscillator radio pulses. From the output of the oscillator 1, the radio pulses (plot 2, figure 2) come through the high-frequency communication circuit 3 to the detector 4 and then (plot 3) to the amplifier 5, the output of which is connected to the input of the modulator 6.

 A high-frequency communication loop 3 is necessary for transmitting a signal (radio pulse) from the low potential side (self-oscillator) to the high potential side (detector, modulator).

 Elements 1-5 form a starting device interacting with a modulator 6 in the control grid circuit of a microwave amplifier 8 (for example, TWT). The modulating pulse (plot 4, figure 2) has a rectangular shape without a "jitter" of the front.

 The microwave signal from the external generator 7 is fed to the input of the microwave amplifier 8, and from its output to the antenna or the load 9. Given that the microwave amplifier 8 is controlled by a modulating signal without “jittering” the front, its output signal also has a low noise level.

 The power supply to all nodes of the microwave pulse amplifier is provided from the power source 10. The oscillator 1 may include an RF amplifier, which is also gated by a video pulse (plot 1).

 The manufacture of a microwave pulse amplifier does not require unique materials and special technologies and can be carried out industrially on component parts of domestic production.

SOURCES OF INFORMATION
1. Guide to radar ed. Skolnik M., Volume 3, Moscow: Soviet Radio, 1979, pp. 36, 86 and 87, 108 and 109.

 2. RF patent 2152125, H 03 F 3/58, publ. 18/2000 g.

Claims (1)

 A microwave pulse generator containing a power source, a microwave amplifier with a modulator in the control grid circuit and a starting device consisting of a high-frequency communication loop, detector and amplifier, the output of which is connected to the modulator input, and the microwave signal from an external generator arrives at the input of a microwave amplifier with a modulator in the control grid circuit, characterized in that a self-oscillator with a shock excitation circuit is introduced into the starting device, to the input of which a shock driver output is connected pulse, the output from the oscillator circuit with shock excitation RF pulses received through a high frequency communication circuit to the detector and further to the amplifier, and the power to all of said nodes is provided from the power source.

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