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发明申请
US20100130155A1 Low-Cost Receiver Using Tracking Bandpass Filter and Lowpass Filter 有权
低成本接收机采用跟踪带通滤波器和低通滤波器

Low-Cost Receiver Using Tracking Bandpass Filter and Lowpass Filter
摘要：
A receiver (400) includes a tracking bandpass filter (420), a tunable lowpass filter (434), a local oscillator (442), and a mixer (444). The tracking bandpass filter (420) has an input for receiving a radio frequency (RF) input signal, and an output. The tunable lowpass filter (434) has an input coupled to the output of the tracking bandpass filter (420), and an output. The local oscillator (422) has a first output for providing a local oscillator signal, which is characterized as being a square wave signal at the desired intermediate frequency (IF). The mixer (444) has a first input coupled to the output of the tunable lowpass filter (434), a second input coupled to the output of the local oscillator (442), and a first output for providing an IF signal at the desired IF. The tunable lowpass filter (434) is configured to substantially attenuate a third harmonic of the frequency of the local oscillator signal.
摘要（中）：

接收器（400）包括跟踪带通滤波器（420），可调谐低通滤波器（434），本地振荡器（442）和混频器（444）。 跟踪带通滤波器（420）具有用于接收射频（RF）输入信号和输出的输入。 可调谐低通滤波器（434）具有耦合到跟踪带通滤波器（420）的输出的输入和输出。 本地振荡器（422）具有用于提供本地振荡器信号的第一输出，其被表征为在期望的中频（IF）下的方波信号。 混频器（444）具有耦合到可调谐低通滤波器（434）的输出的第一输入端，耦合到本地振荡器（442）的输出端的第二输入端和用于在期望的IF 。 可调谐低通滤波器（434）被配置为基本上衰减本地振荡器信号的频率的三次谐波。

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