Automatic frequency control system using multiple

专利名称：Automatic frequency control system using

multiple threshold levels and method ofusing same

发明人：Alejandro G. Blanco,Richard S.

Young,Shahriar Emami,Jianping Miller

申请号：US08/835364申请日：19970407公开号：US05963851A公开日：19991005

摘要：A radio device requires a tunable transceiver such that the transceiver can beaccurately set to a desired frequency. When a signal with known frequency accuracy isbeing received, an offset detector can determine the frequency offset generated by thetransceiver due to improper tuning. An automatic frequency control (AFC) system (100) iscomprised of a tunable transceiver, an offset detector (103) and an AFC controlprocessor (105) for utilizing information from the offset detector to reduce the

inaccuracy in frequency by tuning the transceiver towards the received signal frequency.The AFC control processor (105) utilizes one of more threshold levels for defining amaximum correction threshold (311) based upon the desired maximum offset correction.These thresholds are used by the AFC control processor (105) to efficiently control thepredetermined frequency range of the tunable transceiver (101) for most efficientoperation.

申请人：MOTOROLA, INC.

代理人：Frank M. Scutch, III

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