专利名称：Apparatus for detecting a signaling channel
during scanning including a controlledfrequency converter circuit and a controlledfilter bandwidth, and a method therefor
发明人：Minh H. Duong,Donald A. Dorsey,Robert M.
Johnson, Jr.
申请号：US08/236736申请日：19940502公开号：US05511235A公开日：19960423
摘要：A receiver has a channel scan mode of operation and a communication mode ofoperation. In the channel mode of operation, the passband of a filter is narrowed relativeto the passband of the filter in the communication mode. According to another aspect ofthe circuit, a local oscillator is selectively phase locked to an internal clock during channelscanning and locked to the incoming signal during a communication mode operation.
申请人：MOTOROLA, INC.
代理人：Randall S. Vaas
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