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    • 2. 发明申请
    • GPS Baseband Architecture
    • GPS基带架构
    • US20120194384A1
    • 2012-08-02
    • US13440974
    • 2012-04-05
    • Ricardo dos Santos ReisCarlos Azeredo Leme
    • Ricardo dos Santos ReisCarlos Azeredo Leme
    • G01S19/37
    • G01S19/36G01S19/33G01S19/37
    • A GPS baseband architecture provides flexibility and power consumption and chip area usage advantages. The GPS baseband architecture includes a first stage having a preamplifier coupled to a low noise amplifier, which is coupled to a mixer. A PLL provides the mixer with a frequency to convert a signal to a higher intermediate (IF) frequency. The output of the mixer is fed to a poly-phase filter. The output of the poly-phase filter is fed to a programmable gain amplifier (PGA), whose output is fed to an analog-to-digital converter (ADC) to produce an output GPS signal. A saturation bit of the ADC is used to control the PGA through a digital amplifier gain control (AGC) circuit.
    • GPS基带架构提供了灵活性和功耗以及芯片面积使用的优势。 GPS基带架构包括具有耦合到耦合到混频器的低噪声放大器的前置放大器的第一级。 PLL为混频器提供将信号转换为较高中频(IF)频率的频率。 混合器的输出被馈送到多相滤波器。 多相滤波器的输出被馈送到可编程增益放大器(PGA),其输出被馈送到模数转换器(ADC)以产生输出GPS信号。 ADC的饱和位用于通过数字放大器增益控制(AGC)电路来控制PGA。
    • 6. 发明授权
    • Low noise amplifier
    • 低噪声放大器
    • US07795981B2
    • 2010-09-14
    • US11968103
    • 2007-12-31
    • Ricardo dos Santos Reis
    • Ricardo dos Santos Reis
    • H03F3/04
    • H03F1/223H03F1/26H03F3/195H03F2200/18H03F2200/21H03F2200/294H03F2200/421H03F2200/451
    • The invention teaches an amplifier (100) with an input signal (IN) coupled to the gate of a second transistor (Q2) and an output signal (OUT) coupled to an output node between a third resistor (R3) and the drain of the second transistor (Q2). A third transistor (Q3) is coupled in parallel between the output node and the gate of a second transistor (Q2). A first bias signal (Vbias) is coupled to the output node and the gate of the third transistor (Q3). The amplifier preferably also includes a plurality of switchable resistors coupled to the output node to adjust the output for process variations.The invention also describes a method of compensating for process variations in an output of an amplifier which comprises producing a reference signal dependent on the difference between a reference value and an actual value and switching one or more resistors into the output of the amplifier to adjust the output of the amplifier to reflect the process variations. The reference signal is produced by comparing the differential inputs of a reference input produced from a reference potential across a first resistor 302 having a reference value in series with a constant current source 304 and an actual input produced from an actual potential across a second resistor 303 having substantially the same reference value. The second resistor 303 is in series with the channel of a transistor 301.
    • 本发明教导了具有耦合到第二晶体管(Q2)的栅极的输入信号(IN)的放大器(100)和耦合到第三电阻器(R3)与第三晶体管(Q2)的漏极之间的输出节点的输出信号(OUT) 第二晶体管(Q2)。 第三晶体管(Q3)并联耦合在输出节点和第二晶体管(Q2)的栅极之间。 第一偏置信号(Vbias)耦合到输出节点和第三晶体管(Q3)的栅极。 放大器还优选地还包括耦合到输出节点的多个可切换电阻器,以调整用于过程变化的输出。 本发明还描述了一种补偿放大器输出中的工艺变化的方法,该方法包括根据参考值和实际值之间的差异产生参考信号,并将一个或多个电阻器切换到放大器的输出中,以调整 放大器的输出反映过程变化。 参考信号是通过比较具有与恒定电流源304串联的参考值的第一电阻器302上的参考电位产生的参考输入的差分输入和从第二电阻器303两端的实际电位产生的实际输入来产生的。 具有基本上相同的参考值。 第二电阻器303与晶体管301的沟道串联。