The design of low-power consumption LC resonant amplification circuit

Resonant circuit is widely used in communication system and other kinds of electronic systems. In most cases, the signal induced by the antenna of a receiver is always very weak, which calls for high-frequency small-signal resonant amplifier to restore the signal. The design in this article is composed of three modules: attenuation circuit, small-signal amplifying circuit, and voltage regulator circuit. We use integrated chips in attenuation circuit. We choose transformer feedback LC oscillator circuit to select standard 15MHz signal, and we use triode to implement 60dB amplifying of the high-frequency small-signal. The voltage regulator circuit is constructed by LM317 three-terminal adjustable voltage regulator. After examination, the output signal is barely distorted and this circuit is low-power consumption and high-gain.