| 摘要 |
The present utility model provides a signal input device, a global positioning system (GPS) frequency adjuster, and a terminal. The signal input device comprises a pulse density modulation (PDM) wave output port, and a PDM wave receiving port for receiving a PDM wave. A first phase-shift RC circuit is connected to the PDM wave output port and the PDM wave receiving port, and a buffer is connected between the PDM wave output port and the first RC circuit. By means of the present utility model, a problem in the related art that the fluctuation of the amplitude of a PDM wave cannot be effectively inhibited is solved, thereby achieving an effect of buffering the fluctuation of the amplitude of the PDM wave. |
