Circuit structure with signal amplification function

Abstract

The invention discloses a circuit structure with a signal amplification function. The circuit structure comprises an amplifier, a transformer, a second resistor, a third resistor, a fourth resistor, a first capacitor, a third capacitor and a signal source, wherein a third pin and a fourth pin of the amplifier are connected to both ends of a secondary coil of the transformer; both ends of a primary coil of the transformer are connected to both ends of the signal source; a slide tap is arranged on the primary coil of the transformer; a fourth pin of the amplifier is connected to one end of the third resistor; the other end of the third resistor is connected to a fifth pin of the amplifier; both ends of the third resistor are connected to the first capacitor in parallel; and the fifth pin of the amplifier is taken as an output end of the amplifier. The slide tap is arranged on the primary coil of the transformer, so that the signal input strength is changed, and a feedback resistor is connected to the capacitor in parallel, so that the purposes of improving the operational amplifier stability and preventing the self-excitation shock are realized.

Description

technical field [0001] The present invention relates to a circuit structure, and in more detail, relates to a circuit structure with a signal amplification function. Background technique [0002] In RF system engineering, the three important parameters of frequency, power and impedance are all characteristics that characterize RF system engineering and circuits. These three parameter characteristics are closely related to all radio frequency circuit types, principles and characteristics. Since the three important parameters of frequency, power and impedance are the three core characteristics of RF system engineering, they are called the three major elements of RF signals, which can vividly reflect the basic content of RF system engineering and its circuits. The three elements of frequency, power and impedance not only have independent characteristics, but also affect each other. By frequency, one radio frequency signal can be isolated from another radio frequency signal, a...

AI Technical Summary

Problems solved by technology

[0004] Existing preamplifiers are large in size, high in power consumption, and have serious noise interference. In addition, the size of the signal input cannot be adjusted, and excitation oscillations sometimes occur during the signal feedback process.

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