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US08498600B2 Automatic gain control system with dual-RSSI interference detection for optimization of sensitivity and adjacent channel rejection performance of RF receivers 有权
具有双RSSI干扰检测的自动增益控制系统，用于优化RF接收机的灵敏度和相邻信道抑制性能

Automatic gain control system with dual-RSSI interference detection for optimization of sensitivity and adjacent channel rejection performance of RF receivers
Abstract:
A tuner includes a low noise amplifier (LNA), a first received signal strength indicator (RSSI), a mixer, an intermediate frequency (IF) filter, a second RSSI and an adjustment unit. The LNA amplifies a radio frequency (RF) signal. The first RSSI detects received signal strength indication of the RF signal and obtains a first signal strength voltage. The mixer is coupled to the LNA and down-converts the RF signal into a first IF signal according to a local oscillation frequency. The IF filter is coupled to the mixer and filters the first IF signal to obtain a second IF signal. The second RSSI detects received signal strength indication of the second IF signal and obtains a second signal strength voltage. The adjustment unit adjusts a gain of the LNA according to the first signal strength voltage and the second signal strength voltage.
Abstract(Chinese):

调谐器包括低噪声放大器（LNA），第一接收信号强度指示器（RSSI），混频器，中频（IF）滤波器，第二RSSI和调整单元。 LNA放大射频（RF）信号。 第一RSSI检测RF信号的接收信号强度指示并获得第一信号强度电压。 混频器耦合到LNA，并根据本地振荡频率将RF信号下变频成第一IF信号。 IF滤波器耦合到混频器并对第一IF信号进行滤波以获得第二IF信号。 第二RSSI检测第二IF信号的接收信号强度指示并获得第二信号强度电压。 调整单元根据第一信号强度电压和第二信号强度电压来调整LNA的增益。

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