公开(公告)号：US5077546A

公开(公告)日：1991-12-31

申请号：US610108

申请日：1990-11-07

申请人： Ralph W. Carfi ,  Alexander Chico ,  Victor J. Jacek ,  Joseph S. Calvitto

发明人： Ralph W. Carfi ,  Alexander Chico ,  Victor J. Jacek ,  Joseph S. Calvitto

IPC分类号： H03B19/18

CPC分类号： H03B19/18

摘要： A low phase noise frequency multiplier is disclosed for multiplying a sine wave obtained from a low phase noise crystal oscillator to higher frequencies than can be directly obtained from a crystal oscillator. The multiplication occurs without the ordinary increase in phase noise. The multiplier, when tripling the frequency contains a low phase noise frequency doubler. The double and triple frequency terms in the tripler are synthesized from two orthogonally related derivatives of the same wave, which are then multiplied in a double balanced mixer. The process reinforces the desired harmonics while not reinforcing the short term random phase noise, and produces a substantial improvement in the single sideband phase noise ratio over conventional frequency multipliers.