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    • 1. 发明申请
    • PLL circuit reduced phase noise of oscillating signal
    • PLL电路降低了振荡信号的相位噪声
    • US20050088243A1
    • 2005-04-28
    • US10963072
    • 2004-10-12
    • Kiyoshi Sasai
    • Kiyoshi Sasai
    • H03L7/00H03L7/093
    • H03L7/093
    • An active loop filter has a pre-amplifier for receiving an error signal, a current mirror circuit for supplying a bias current to the pre-amplifier, and an inverting amplifier driven by the pre-amplifier. The pre-amplifier has a first transistor of which the collector is connected to a power supply source and a second transistor of which the collector is connected to the emitter of the first transistor and in which the collector current flows in common with the first transistor, the emitter of the second transistor is connected with the inverting amplifier, the reference current of the current mirror circuit is supplied to the base of the first transistor, the output current of the current mirror circuit is supplied to the base of the second transistors, and the error signal is input to the base of the first transistor.
    • 有源环路滤波器具有用于接收误差信号的前置放大器,用于向前置放大器提供偏置电流的电流镜电路以及由前置放大器驱动的反相放大器。 前置放大器具有第一晶体管,集电极连接到电源,第二晶体管的集电极连接到第一晶体管的发射极,集电极电流与第一晶体管共同流动, 第二晶体管的发射极与反相放大器连接,电流镜电路的参考电流被提供给第一晶体管的基极,电流镜电路的输出电流被提供给第二晶体管的基极,并且 误差信号被输入到第一晶体管的基极。