The research on the test of the frequency characteristics of the quiescent operating point stabilizing circuit is carried out by using the Multisim 12.0 simulation software,and the change laws of the amplitude frequency characteristic curve and phase frequency characteristic curve are observed.By using the AC analysisor Potter instrument and other methods,the change of the values of the intermediate frequency voltage gain,upper cut-off frequency and lower cut-off frequency,etc.,which is caused by the circui...