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    • 3. 发明申请
    • LINEAR TRANSIMPEDANCE AMPLIFIER WITH MULTIPLEXED GAIN STAGE
    • 具有多重增益级的线性放大放大器
    • WO2008144649A1
    • 2008-11-27
    • PCT/US2008/064124
    • 2008-05-19
    • FINISAR CORPORATIONDENOYER, Gilles, P.
    • DENOYER, Gilles, P.
    • H03F3/08H03G3/20
    • H03G3/3084H03F3/08H03G1/0017H03G1/0023H03G1/0082
    • A linear transimpedance amplifier includes a forward transimpedance circuit that receives an input signal from an optical device. The forward transimpedance circuit generates a linear output signal. The forward transimpedance circuit includes a first gain path and a second gain path, the first gain path configured to amplify the input signal when the first gain path is at a lower input impedance relative to the second gain path and the second gain path configured to amplify the input signal when the second gain path is at a lower input impedance relative to the first gain path. A feedback circuit includes a first circuit that detects a low frequency component of the output signal. The feedback circuit further includes a second circuit that is driven by the low frequency component of the output signal and is connected with the forward transimpedance circuit such that the second circuit uses an average optical device current to at least partially control when the input signal is amplified by the first gain path and when the input signal is amplified by the second gain path.
    • 线性跨阻抗放大器包括从光学装置接收输入信号的正向互阻抗电路。 正向互阻电路产生线性输出信号。 正向跨阻抗电路包括第一增益路径和第二增益路径,第一增益路径被配置为当第一增益路径相对于第二增益路径处于较低的输入阻抗时放大输入信号,而第二增益路径被配置为放大 当第二增益路径相对于第一增益路径处于较低的输入阻抗时的输入信号。 反馈电路包括检测输出信号的低频分量的第一电路。 反馈电路还包括由输出信号的低频分量驱动的第二电路,并与正向跨阻抗电路连接,使得第二电路使用平均光器件电流至少部分地控制输入信号的放大时间 通过第一增益路径和当输入信号被第二增益路径放大时。