SU681537A2 - Distributed gain amplifier - Google Patents

Description

The invention relates to radio engineering and can be used to enhance the power of signals in a wide frequency band.

From the main auth. No. 570976 is a known amplifier with a distributed gain, comprising amplifying elements to which an input uniform line and an output line are connected, consisting of a homogeneous part loaded on the ballast resistance and a non-uniform part, the output of which is the amplifier output, between the ballast resistance and the homogeneous part the output line includes a correction circuit, in addition, the correction circuit is made in the form of a non-uniform line, the law of variation of the waveguide resistance of which is a mirror image the law of change of the wave resistance of the non-uniform part of the output line.

However, this amplifier has low efficiency in the low-frequency region.

The goal of isoretreni is to increase the efficiency in the low-frequency region when operating at a consistent load.

For this purpose, in an amplifier with distributed amplification, containing amplifying elements, to which a uniform input line and an output line, consisting of a homogeneous part loaded on the impedance, and a non-uniform part, the output of which is an amplifier output, are connected, a homogeneous part of the output line is included. Correction circuit,

In addition, the correction circuit is made in the form of an inhomogeneous line, transforming the resistance of the homogeneous part of the output line to a greater (n times) magnitude of the electrical resistance.

The drawing shows the structural electrical circuit of the proposed amplifier.

A distributed amplifier contains amplifying elements 1, an input homogeneous line 2, an output inhomogeneous line consisting of an inhomogeneous part 3 and a homogeneous part 4, a correction circuit 5, ballasts 6 and a matched load 7.

The device works as follows.

Claims (2)

In the working frequency range, the signal arriving at the amplifier input causes a voltage wave in the input homogeneous line, which moves along the line, excites the amplifying elements 1. The amplifying elements 1, in turn, create a capr. Wave in the input non-uniform line, moving towards the matched load 7 with the same speed as the waves in the input homogeneous line 2. Part of the wave reflected from the matched load 7, pass into the output non-uniform line in the opposite direction and is absorbed in the ballast resistance 6. In the proposed device, the magnitude of the ballast resistance b is significantly larger than the resistance of the matched load 7. Consequently, a smaller part of the power supplied by the amplifiers elements 1 to the output line, will be pushed on the ballast impedance 6, and the larger goes to the matched load 7, thereby increasing the efficiency of the amplifier in all frequency range. The technical and economic effect of the proposed device lies not only in improving the efficiency of the amplifier, but also in what is present. The distributed amplifiers have a limited frequency range from the bottom and, in fact, are bandpass amplifiers. This limitation is explained by the fact that in the low-frequency range of the working frequency range the amplifier has low efficiency. In the proposed amplifier with a distributed gain in the low-frequency region, the correction circuit 5 will not transform the magnitude of the ballast impedance to the wave impedance value of the uniform part 4 of the output non-uniform line, which allows for greater efficiency in this frequency range and expanding the operating frequency range of the amplifier. Claims of the Invention Amplifier with distributed amplification according to auth.St. No. 570976, characterized in that, in order to increase the efficiency in the low-frequency region when operating on a matched load, the correction circuit is made in the form of a non-uniform line transforming the resistance of the homogeneous part of the output line to the ballast resistance value n times. 1 to 9 ABOUT- ABOUT-