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Tunable notch filter for image frequency and conducted local oscillator leakage rejection
Tunable notch filter for image frequency and conducted local oscillator leakage rejection
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机译:可调谐陷波滤波器,用于镜像频率和传导本振泄漏抑制
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摘要
A tunable notch filter for the front end of an RF receiver includes magnetically coupled input and output tunable stages each responsive to a tuning voltage provided thereto. Each of the input and output stages includes a respective series and parallel resonant circuit wherein the parallel resonant circuits are tuned to a selected RF frequency and the series resonant circuits are tuned to a frequency approximately equal to that of a local oscillator. By using the series resonant circuits to create a notch at a frequency approximating that of the local oscillator, conducted local oscillator leakage from the receiver's antenna is substantially reduced and local oscillator image frequency rejection is substantially improved.
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