专利名称：Zero-IF receiver发明人：Adrianus Van Bezooijen申请号：US08/904381申请日：19970801公开号：US06009126A公开日：19991228
摘要：Known is a zero intermediate frequency receiver or zero-IF receiver in which DC-offset correction is done in the I- and Q-paths, after mixing down of the received RF-signal or of an IF-signal. Such a DC- offset correction is not sufficient for high gain I- andQ-paths, particularly not in pagers for receiving long messages. Furthermore, no optimalpower saving is achieved if such a receiver alternately operates in receive mode and sleepmode. A zero intermediate frequency receiver is proposed in which DC-offset correctionis distributed over the high gain I- and Q- path. Preferably, blocking means are providedbetween DC- offset correction circuits and low pass filters in the I- and Q-path to preventthat an output signal of an upstream DC-offset correction circuit in the path excites adownstream low pass filter in the path during DC- offset correction. Herewith,considerable power savings are achieved.
申请人：U.S. PHILIPS CORPORATION
更多信息请下载全文后查看
因篇幅问题不能全部显示，请点此查看更多更全内容