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专利名称：Television tuner发明人：David Albert Sawyer申请号：US10198287申请日：20020718
公开号：US20030025841A1公开日：20030206
专利附图：
摘要：A universal highly integrated television tuner is provided for receiving televisionsignals of many different types and standards from terrestrial or cable sources. The inputsignals are supplied to an RF attenuator forming part of an automatic gain control loop.A tracking low noise amplifier supplies the signals to a tracking filter. The filtered signals
are supplied to a first frequency changer , which performs up-conversion to a high firstintermediate frequency. The resulting signal is filtered before being supplied to a secondfrequency changer performing down-conversion to a conventional second intermediatefrequency. The resulting signals are supplied to an automatic gain control detector andto second intermediate frequency filters. The detector detects the signal level upstreamof the single channel filtering. Both frequency changers comprise image reject mixerswhich receive local oscillator signals from tunable local oscillators controlled by hybridmash fractional N phase locked loop synthesisers.
申请人：SAWYER DAVID ALBERT
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