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1.发明授权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公开(公告)号：US08498600B2
公开(公告)日：2013-07-30
申请号：US13159921
申请日：2011-06-14
CPC分类号： H03G3/3078
摘要： 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.
摘要翻译： 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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公开(公告)号：US20100189194A1
公开(公告)日：2010-07-29
申请号：US12161514
申请日：2007-01-19
CPC分类号： H03L7/1976 , G06F1/3203 , G06F1/3287 , H03D7/16 , H03F3/189 , H03F3/45188 , H03F2200/294 , H03F2200/372 , H03F2200/489 , H03F2200/492 , H03J1/005 , H03K23/544 , H04H2201/20 , Y02D10/126 , Y02D10/171 , Y02D50/20 , Y02D70/122
摘要： A frequency generation circuit comprises a crystal oscillator (10) for providing an input frequency, a phase-locked loop circuit (28), and a programmable frequency divider (42) for frequency dividing an output from the phase-locked loop circuit. The frequency generation circuit can generate a plurality of different output frequencies for supply to respective DAB and FM tuners (50, 60, 70). The frequency generation circuit can be used, together with a baseband circuit (14), in a radio receiver (1, 2). The same oscillator (10) and phase-locked loop circuit are used to drive the baseband circuit.
摘要翻译： 频率发生电路包括用于提供输入频率的晶体振荡器（10），锁相环电路（28）和用于对来自锁相环电路的输出进行分频的可编程分频器（42）。 频率发生电路可以产生多个不同的输出频率以供应给相应的DAB和FM调谐器（50,60,70）。 频率发生电路可以与无线电接收机（1,2）中的基带电路（14）一起使用。 使用相同的振荡器（10）和锁相环电路驱动基带电路。
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