Novel receiving circuit

The present invention discloses a novel receiving circuit comprising an input matching and frequency-selecting circuit, a high-level radioactive tube, an impedance matching and frequency-selecting circuit, a mixer tube and an output matching and frequency-selecting circuit. According to the technical scheme of the invention, the medium-frequency transformer of the input matching and frequency-selecting circuit, the medium-frequency transformer of the impedance matching and frequency-selecting circuit and the medium-frequency transformer of the output matching and frequency-selecting circuit medium-frequency transformer are replaced by fixed inductors. In this way, the novel receiving circuit is miniaturized in design, high in stability and reliability, and relatively low in production cost. Meanwhile, the fixed inductors are universal products and can be purchased from multiple manufacturers. Therefore, the purchasing difficulty is lowered.