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1. 发明授权

US07081791B2 Automatically adjusting low noise amplifier 有权
标题翻译：自动调节低噪声放大器
公开(公告)号：US07081791B2
公开(公告)日：2006-07-25
申请号：US10820675
申请日：2004-04-07
申请人： Lorenzo M. Carpineto , Eric Duvivier , Stefano Cipriani
发明人： Lorenzo M. Carpineto , Eric Duvivier , Stefano Cipriani
IPC分类号： H03G3/20
CPC分类号： H03F1/0272 , H03F3/45188 , H03F2200/294 , H03F2200/372 , H03F2203/45048 , H03F2203/45396 , H03G3/3036 , H03G2201/103 , H03G2201/206 , H03G2201/307
摘要： A low noise amplifier circuit (10) includes an attenuator (12) for receiving a calibration signal and generating an attenuated calibration signal. A low noise amplifier (14) amplifies the attenuated calibration signal in calibration mode or amplifies a functional signal in functional mode. In calibration mode, a envelope detector/comparator (16) compares the calibration signal with the output of the low noise amplifier and generates a compensation signal indicating a deviation between the two signals. The gain of the low noise amplifier is adjusted responsive to the compensation signal.
摘要翻译：低噪声放大器电路（10）包括用于接收校准信号并产生衰减的校准信号的衰减器（12）。低噪声放大器（14）在校准模式下放大衰减的校准信号，或者在功能模式下放大功能信号。在校准模式中，包络检测器/比较器（16）将校准信号与低噪声放大器的输出进行比较，并产生指示两个信号之间的偏差的补偿信号。响应补偿信号调整低噪声放大器的增益。

2. 发明授权

US07200372B2 Reduction of dynamic DC offsets in a wireless receiver 有权
标题翻译：减少无线接收机中的动态直流偏移
公开(公告)号：US07200372B2
公开(公告)日：2007-04-03
申请号：US10770947
申请日：2004-02-03
申请人： Lorenzo M. Carpineto , Angel Ezquerra-Moreu , Estelle Nguyen
发明人： Lorenzo M. Carpineto , Angel Ezquerra-Moreu , Estelle Nguyen
IPC分类号： H04B7/00 , H04B1/06
CPC分类号： H04B1/109 , H04B1/30
摘要： A gain control system in a Direct Conversion Receiver or similar receiver, includes an automatic gain control circuit which determines whether a low noise amplifier, which amplifies signals from an antenna prior to mixing with signals from a local oscillator, should be set to a high gain or a low gain. The output of the mixer is analyzed by a blocker detect circuit to determine whether a blocker signal is present. Based on the presence of a blocker signal and the power level of the useful signal, the gain of the low noise amplifier may be reduced from the high gain to an intermediate gain in order to reduce self mixing between the radio frequency and local oscillator ports of the mixer, which may lead to dynamic DC offsets.
摘要翻译：直接转换接收器或类似接收器中的增益控制系统包括自动增益控制电路，其确定在与来自本地振荡器的信号混频之前放大来自天线的信号的低噪声放大器应当被设置为高增益或低增益。通过阻塞检测电路分析混频器的输出，以确定是否存在阻塞信号。基于阻塞信号的存在和有用信号的功率电平，低噪声放大器的增益可以从高增益减小到中间增益，以便减少射频和本地振荡器端口之间的自混合混频器，这可能导致动态DC偏移。

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