Patent ID: 6049724
Filing Date: 2000-04-11
Classification: H04B

Abstract:
An apparatus for eliminating interfering harmonics caused by an AC signal source used for providing power to a time division communications system characterized by periods of inactivity between periods of active communications, wherein said apparatus comprises:a voltage converter coupled to the AC signal source for generating a DC signal therefrom;a switching transistor responsive to the gating signal for switching the AC signal source to the voltage converter;a gating signal coupled to the AC signal source for connecting the AC signal source to the voltage converter during the periods of inactivity, and for disconnecting the AC signal source during the periods of active communications; anda voltage holding and sampling circuit coupled to the voltage converter for storing the DC signal during the periods of inactivity when the AC signal source is connected, and for supplying an ultra-clean DC signal to the switching transistor during the periods of active communications when the AC signal source is disconnected, thereby eliminating interfering harmonics from the AC signal source.