Abstract: Disclosed in the present application are a method for improving performance of a low-intermediate frequency receiver, a storage medium, and a receiver. The method comprises: selecting a local oscillator signal from a preset local oscillator frequency set as an initial local oscillator signal to perform frequency mixing processing on an input signal, so as to obtain a low-intermediate frequency signal comprising a low-intermediate frequency useful signal and a low-intermediate frequency interference signal; determining whether an energy ratio of the low-intermediate frequency interference signal to the low-intermediate frequency useful signal is greater than a first preset ratio; and if the energy ratio is greater than the first preset ratio, selecting another local oscillator frequency from the preset local oscillator frequency set as the current local oscillator signal to process the input signal.

Abstract: An attenuator includes a first 3 dB bridge, a second 3 dB bridge and an amplifying tube group, where the amplifying tube group includes a first amplifying tube and a second amplifying tube, a drain of the first amplifying tube is connected to a first output port of the first 3 dB bridge, a source of the first amplifying tube is connected to a first input port of the second 3 dB bridge, a drain of the second amplifying tube is connected to a second output port of the first 3 dB bridge, and a source of the second amplifying tube is connected to a second input port of the second 3 dB bridge; where gates of the first amplifying tube and the second amplifying tube are respectively connected to the same voltage source or different voltage sources having the same voltage.

Abstract: An attenuator includes a first 3 dB bridge, a second 3 dB bridge and an amplifying tube group, where the amplifying tube group includes a first amplifying tube and a second amplifying tube, a drain of the first amplifying tube is connected to a first output port of the first 3 dB bridge, a source of the first amplifying tube is connected to a first input port of the second 3 dB bridge, a drain of the second amplifying tube is connected to a second output port of the first 3 dB bridge, and a source of the second amplifying tube is connected to a second input port of the second 3 dB bridge; where gates of the first amplifying tube and the second amplifying tube are respectively connected to the same voltage source or different voltage sources having the same voltage.